A material hot melt extrusion device based on 3D printing

Abstract

The present invention discloses a material hot melt extrusion device based on 3D printing, which relates to the technical field of 3D printing material hot melt extrusion, and comprises a shell, the top outer wall of the shell is fixedly connected with a mounting seat, the top outer wall of the shell is fixedly connected with a first guide tube, the wire passes through the inside of the first guide tube, the inside of the shell is provided with a feeding assembly for conveying the wire, the inside of the shell is provided with a melting assembly for melting the wire, and the melting assembly is arranged below the feeding assembly. In the present invention, the material located inside the heating box can be pushed toward the direction of the feeding cylinder, and when the protrusion is separated from the fixed ball as the rotating disk rotates, more and more material is accumulated on one side of the push plate, and at this time, the push plate is displaced together with the connecting rod, so that the material can be quickly pushed into the inside of the feeding cylinder, which is convenient for the subsequent rapid extrusion of the wire melt and avoids the situation of temporary shortage of melt in the subsequent printing process.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing material hot melt extrusion, and in particular to a material hot melt extrusion device for 3D printing. Background Art

[0002] A 3D printer, also known as a three-dimensional printer (3DP), is a machine using cumulative manufacturing technology, that is, rapid prototyping technology. It is based on a digital model file and uses special wax materials, powdered metals or plastics and other adhesive materials to print layers of adhesive materials to create three-dimensional objects. It uses a layer-by-layer stacking method to produce three-dimensional models. Its operation process is similar to that of a traditional printer, except that traditional printers print ink on paper to form a two-dimensional plane drawing, while a three-dimensional printer stacks liquid photosensitive resin materials, molten plastic filaments, gypsum powder and other materials layer by layer through spraying binders or extrusion to form a three-dimensional entity.

[0003] After searching, the Chinese invention patent with announcement number CN116061435A discloses a 3D printing extrusion mechanism and a 3D printer, including a shell, the inner walls of both ends of the shell near the top are fixedly installed with mounting side seats, and the two sides of the mounting side seats are fixedly installed with melting frames, and a heating component is arranged inside the melting frame, a feed pipe is fixed at one end of the top of the melting frame, and a feed pipe is fixed at one end of the top of the shell, and wires are arranged inside the feed pipe and the feed pipe.

[0004] Based on the existing technology, the above patent still has the following shortcomings: in the process of melting the wire, the heating tube is vertically arranged inside the melting frame, so that the wire cannot fully contact the heating tube during the insertion process, and after the wire is melted, the molten wire needs to automatically flow into the extrusion pipe, which affects the discharge rate of the wire. At the same time, the vertically arranged heating tube will also block the molten wire. Therefore, a material hot melt extrusion device based on 3D printing is urgently needed to solve the above problems. Summary of the invention

[0005] In view of the problems in the related art, the present invention proposes a material hot melt extrusion device for 3D printing to overcome the above-mentioned technical problems existing in the existing related art.

[0006] The technical solution of the present invention is achieved in this way:

[0007] A material hot melt extrusion device for 3D printing, comprising a housing, a mounting seat is fixedly connected to the top outer wall of the housing, a first guide tube is fixedly connected to the top outer wall of the housing, and a wire passes through the inside of the first guide tube;

[0008] A feeding assembly for conveying wires is provided inside the housing;

[0009] A melting material assembly for melting the wire is arranged inside the shell, and the melting material assembly is arranged below the feeding assembly. A heating box is fixedly connected to the inside of the shell, and the melting material assembly is arranged inside the heating box.

[0010] The melt assembly includes a heating plate disposed inside the heating box, and a controller is fixedly connected to an outer wall of one side of the shell, and the controller is electrically connected to the heating plate;

[0011] A scraper assembly is provided inside the heating box;

[0012] The top outer wall of the shell is fixedly connected to a motor, the output end of the motor is fixedly connected to a worm, the bottom end of the worm is fixedly connected to a vertical column, the circumferential outer wall of the vertical column is fixedly connected to a driving gear, a fixing seat is fixedly connected to an inner wall of one side of the shell, the vertical column is rotatably connected to the fixing seat, the driving gear is meshed with a first driven gear, the circumferential inner wall of the first driven gear is fixedly connected to a first rotating column, one end of the first rotating column is rotatably connected to the fixing seat, the circumferential outer wall of the first rotating column is fixedly connected to a second driven gear, the The second driven gear is meshed with the third driven gear, and the circumferential inner wall of the third driven gear is fixedly connected to the third rotating rod, and the bottom end of the third rotating rod is fixedly connected to a spiral feeding pipe, the cross-section of the heating box is L-shaped, and a feeding pipe is arranged inside the heating box, and the spiral feeding pipe is located inside the feeding pipe, and a conical head is arranged at the bottom of the feeding pipe, and the conical head is threadedly connected to an extrusion head, and a gear box is fixedly connected to the inner wall of one side of the shell, and the second driven gear and the third driven gear are both located inside the gear box.

[0013] Furthermore, the worm is meshed with a worm wheel, and a second rotating rod is fixedly connected to the circumferential inner wall of the worm wheel.

[0014] Furthermore, the feeding assembly includes a second gear fixedly connected to the circumferential outer wall of the second rotating rod, the second gear is meshed with the first gear, the circumferential inner wall of the first gear is fixedly connected to the first rotating rod, both ends of the first rotating rod and the second rotating rod are rotatably connected to the inner walls of both sides of the shell, the circumferential outer walls of the first rotating rod and the second rotating rod are fixedly connected to transmission rollers, the circumferential outer walls of the transmission rollers are provided with an annular groove, the circumferential inner wall of the annular groove is bonded with a conveyor belt, the circumferential outer wall of the conveyor belt is provided with arc grooves distributed in a circular shape at equal distances, and the circumferential outer wall of the conveyor belt is in contact with the wire.

[0015] Furthermore, further, the cross-section of the heating plate is L-shaped, the width of the heating plate located on one side of the feed pipe gradually decreases from top to bottom, and the heating box is connected to the feed pipe.

[0016] Furthermore, the circumferential outer wall of the first rotating column is fixedly connected to a crank, one end of the crank is rotatably connected to a connecting rod, and the end of the connecting rod away from the crank is rotatably connected to a connecting plate, a rectangular groove is provided on the top outer wall of the heating box, a sliding rod is fixedly connected to the bottom of the connecting plate, both side outer walls of the sliding rod are in contact with both side inner walls of the rectangular groove, and the circumferential outer wall of the shell is fixedly connected to an arc shell, and the arc shell is communicated with the shell.

[0017] Furthermore, the scraper assembly includes a rotating frame fixedly connected to the bottom end of the sliding rod, both ends of the rotating frame are rotatably connected to a rotating shaft, one end of the rotating shaft is fixedly connected to a rotating tube, the circumferential outer wall of the rotating tube is fixedly connected to a push plate, one side outer wall of the rotating frame is fixedly connected to a second spring, one end of the second spring away from the rotating frame is fixedly connected to the push plate, the push plate is inclined, the circumferential outer wall of the rotating shaft is fixedly connected to a baffle, and one side outer wall of the rotating frame is fixedly connected to a baffle ring plate.

[0018] Furthermore, the circumferential outer walls of the first rotating rod and the second rotating rod are fixedly connected with a rotating disk, the circumferential outer wall of the rotating disk is fixedly connected with a protrusion, the top outer wall of the heating box is provided with a circular hole, a pressure rod is inserted into the inside of the circular hole, and the end of the pressure rod is fixedly connected with a fixed ball.

[0019] Furthermore, a circular plate is fixedly connected to the circumferential outer wall of the pressure rod, a first spring is fixedly connected to the bottom outer wall of the circular plate, and one end of the first spring away from the circular plate is fixedly connected to the top outer wall of the heating box.

[0020] Furthermore, the second gear is meshed with a third gear, the third gear is meshed with a fourth gear, a rotating rod is fixedly connected to the circumferential inner wall of the fourth gear, and a fixing frame is fixedly connected to the top outer wall of the heating box.

[0021] Furthermore, a second bevel gear is fixedly connected to the circumferential outer wall of the rotating rod, the second bevel gear is meshed with the first bevel gear, a fourth rotating rod is fixedly connected to the circumferential inner wall of the first bevel gear, a swing rod is fixedly connected to the circumferential outer wall of the fourth rotating rod, and the swing rod is located on one side of the wire.

[0022] Beneficial effects of the present invention:

[0023] The present invention provides a material hot melt extrusion device for 3D printing. Through the provided feeding assembly, when the staff needs to perform 3D printing on the product, the motor can be started first, and the worm can be rotated by the motor. During the rotation of the worm, the worm will mesh with the worm wheel. At this time, the second rotating rod can be driven to rotate by the worm wheel. During the rotation of the second rotating rod, the second gear and a group of transmission rollers can be driven to rotate. During the rotation of the second gear, the second gear will mesh with the first gear, thereby driving the first rotating rod and another group of transmission rollers to rotate. Since the first gear and the second gear are meshed, the rotation directions of the two groups of transmission rollers are opposite, and the conveyor belts provided on the outer walls of the two groups of transmission rollers are in contact with the circumferential outer wall of the wire. The friction between the conveyor belt and the wire can realize the conveying of the wire, and the wire can be stably fed into the heating box for subsequent heating and melting.

[0024] The present invention provides a material hot melt extrusion device for 3D printing. Through the provided melt assembly, when the wire is fed into the heating box, the heating plate is started, and the wire can be quickly melted by the heating plate. At the same time, the cross-section of the heating plate is L-shaped, and the width of the heating plate on one side of the feed pipe gradually decreases from top to bottom, so that the melt entering the feed pipe will not always remain in a molten state. This not only avoids the situation where the melt temperature near the extrusion port is too high to affect the subsequent rapid molding of the product, but also avoids a large amount of waste of electric energy.

[0025] The present invention provides a material hot-melt extrusion device for 3D printing, through the provided scraper assembly, during the process of melting the wire, the worm is always in a rotating state, and the driving gear can be driven to rotate during the rotation of the worm, and the first driven gear can be driven to rotate during the rotation of the driving gear, and the first rotating column and the second driven gear can be driven to rotate during the rotation of the first driven gear, and the crank can be driven to rotate together when the first rotating column rotates, and the connecting rod can be pulled to make a reciprocating motion on the top of the heating box through the rotation of the crank, and the sliding rod and the push plate can be driven to reciprocate together during the reciprocating motion of the connecting rod due to the rotational connection between the connecting rod and the connecting plate, and the sliding rod and the push plate can be driven to reciprocate together during the reciprocating motion of the connecting rod, and the push plate will be always in an inclined state due to the action of the spring, thereby preventing the push plate from pushing the molten wire inside the heating box back to one side of it for accumulation during the push back process, and when the push plate is reset to the far When the cam is moved away from one side of the feed tube, the rotating disk fixedly connected to the outer wall of the first rotating rod and the second rotating rod will drive the protrusion to rotate together to a position in contact with the fixed ball. At this time, as the first rotating rod and the second rotating rod continue to rotate, the fixed ball together with the pressure rod will be pressed down. When the pressure rod is subjected to downward pressure, the downward pressure will act on the push plate in an inclined state. At this time, the angle between the push plate and the vertical plane will gradually decrease when the push plate is subjected to pressure. At this time, the distance between the push plate and the bottom of the heating box will also be reduced, so that the material located inside the heating box can be pushed toward the direction of the feed tube. When the protrusion is separated from the fixed ball as the rotating disk rotates, more and more material is accumulated on one side of the push plate. At this time, the push plate is displaced together with the connecting rod, so that the material can be quickly pushed into the feed tube, which is convenient for the subsequent rapid extrusion of the wire melt and avoids the temporary shortage of the molten material during the subsequent printing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0028] Figure 2 It is a schematic diagram of the internal structure of the shell of the present invention.

[0029] Figure 3 For the present invention Figure 2 Schematic diagram of the enlarged structure at point A in the middle.

[0030] Figure 4 It is a schematic diagram of the disassembly of the internal structure of the shell of the present invention.

[0031] Figure 5 For the present invention Figure 4 Schematic diagram of the enlarged structure at point B in the middle.

[0032] Figure 6 It is an enlarged schematic diagram of the internal structure of the shell of the present invention.

[0033] Figure 7 It is a schematic diagram of the split structure of the heating box and the gear box of the present invention.

[0034] Figure 8 For the present invention Figure 7 Schematic diagram of the enlarged structure at point C in the middle.

[0035] Fig. 9 For the present invention Figure 8 Schematic diagram of the enlarged structure at D in the middle.

[0036] Fig.10 It is a schematic diagram of the meshing structure of the second gear, the third gear and the fourth gear of the present invention.

[0037] Fig.11 It is a schematic diagram of the back structure of the push plate of the present invention.

[0038] Fig.12 It is a schematic diagram of the overall cross-sectional plan structure of the present invention.

[0039] In the figure:

[0040] 1. Shell; 2. Mounting seat; 3. Wire; 4. First guide tube; 5. Motor; 6. Arc shell; 7. Extrusion head; 8. Heating box; 9. First gear; 10. Transmission roller; 11. Conveyor belt; 12. First rotating rod; 13. Rotating plate; 14. Bump; 15. Fixed ball; 16. Pressure rod; 17. First spring; 18. Round plate; 19. Rectangular groove; 20. Connecting plate; 21. Sliding rod; 22. Connecting rod; 23. Cone head; 24. Feeding pipe; 25. Second gear; 26. Controller; 27. Worm; 28. Worm wheel; 29. ​​Second rotating rod Moving rod; 30, fixed seat; 31, driving gear; 32, first rotating column; 33, first driven gear; 34, gear box; 35, second driven gear; 36, crank; 37, third gear; 38, fourth gear; 39, heating plate; 40, spiral feeding tube; 41, third driven gear; 42, third rotating rod; 43, push plate; 44, rotating frame; 45, rotating shaft; 46, baffle plate; 47, baffle; 48, fixed frame; 49, first bevel gear; 50, fourth rotating rod; 51, rocker arm; 52, second spring; 53, second bevel gear. DETAILED DESCRIPTION

[0041] The following will be combined with the accompanying 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 belong to the scope of protection of the present invention.

[0042] See also Figure 1-Figure 12 A material hot melt extrusion device for 3D printing includes a housing 1, a mounting seat 2 is fixedly connected to the top outer wall of the housing 1, a first guide tube 4 is fixedly connected to the top outer wall of the housing 1, and a wire 3 passes through the inside of the first guide tube 4;

[0043] A feeding assembly for conveying the wire 3 is provided inside the housing 1;

[0044] A melting material assembly for melting the wire 3 is arranged inside the housing 1, and the melting material assembly is arranged below the feeding assembly. A heating box 8 is fixedly connected to the inside of the housing 1, and the melting material assembly is arranged inside the heating box 8;

[0045] The melt assembly includes a heating plate 39 disposed inside the heating box 8, and a controller 26 is fixedly connected to an outer wall of one side of the housing 1, and the controller 26 is electrically connected to the heating plate 39;

[0046] A scraper assembly is provided inside the heating box 8;

[0047] The top outer wall of the housing 1 is fixedly connected to a motor 5, the output end of the motor 5 is fixedly connected to a worm 27, the bottom end of the worm 27 is fixedly connected to a vertical column, the circumferential outer wall of the vertical column is fixedly connected to a driving gear 31, a fixed seat 30 is fixedly connected to an inner wall of one side of the housing 1, the vertical column is rotatably connected to the fixed seat 30, the driving gear 31 is meshed with a first driven gear 33, the circumferential inner wall of the first driven gear 33 is fixedly connected to a first rotating column 32, one end of the first rotating column 32 is rotatably connected to the fixed seat 30, the circumferential outer wall of the first rotating column 32 is fixedly connected to a second driven gear 35, the second driven gear 35 is meshed with a third driven gear 41, the circumferential inner wall of the third driven gear 41 is fixedly connected to the second driven gear 35, and the circumferential outer wall of the third driven gear 41 is fixedly connected to the second driven gear 35. A third rotating rod 42 is fixedly connected to the inner wall, and a spiral feeding tube 40 is fixedly connected to the bottom end of the third rotating rod 42. The cross section of the heating box 8 is L-shaped. A feeding tube 24 is arranged inside the heating box 8. The spiral feeding tube 40 is located inside the feeding tube 24. A conical head 23 is arranged at the bottom of the feeding tube 24. The conical head 23 is threadedly connected to the extrusion head 7. A gear box 34 is fixedly connected to the inner wall of one side of the shell 1. The second driven gear 35 and the third driven gear 41 are both located inside the gear box 34. The third rotating rod 42 and the spiral feeding tube 40 are driven to rotate together by the third driven gear 41, so that the molten material can be quickly extruded from the extrusion head 7 for printing.

[0048] Preferably, the worm 27 is meshed with a worm wheel 28, and the circumferential inner wall of the worm wheel 28 is fixedly connected to the second rotating rod 29. The feeding assembly includes a second gear 25 fixedly connected to the circumferential outer wall of the second rotating rod 29, and the second gear 25 is meshed with a first gear 9. The circumferential inner wall of the first gear 9 is fixedly connected to the first rotating rod 12. Both ends of the first rotating rod 12 and the second rotating rod 29 are rotatably connected to the inner walls of both sides of the shell 1. The circumferential outer walls of the first rotating rod 12 and the second rotating rod 29 are fixedly connected to the transmission roller 10. The circumferential outer wall of the transmission roller 10 is provided with an annular groove, and the circumferential inner wall of the annular groove is bonded with a conveyor belt 11. The circumferential outer wall of the conveyor belt 11 is provided with arc grooves distributed in a circular shape at equal distances. The circumferential outer wall of the conveyor belt 11 contacts the wire 3, and the worm 2 can be driven by the motor 5. 7 rotates, and during the rotation of the worm 27, it will mesh with the worm wheel 28. At this time, the second rotating rod 29 can be driven to rotate through the worm wheel 28. During the rotation of the second rotating rod 29, the second gear 25 and a group of transmission rollers 10 can be driven to rotate. During the rotation of the second gear 25, it will mesh with the first gear 9, thereby driving the first rotating rod 12 and another group of transmission rollers 10 to rotate. Since the first gear 9 and the second gear 25 are meshed, the rotation directions of the two groups of transmission rollers 10 are opposite, and the conveyor belts 11 arranged on the outer walls of the two groups of transmission rollers 10 are in contact with the circumferential outer walls of the wire 3. The friction between the conveyor belt 11 and the wire 3 can realize the conveying work of the wire 3, and the wire 3 can be stably sent to the inside of the heating box 8 for subsequent heating and melting.

[0049] Preferably, the cross-section of the heating plate 39 is L-shaped, and the width of the heating plate 39 located on one side of the feed pipe 24 gradually decreases from top to bottom. The heating box 8 is connected to the feed pipe 24. When the wire 3 is fed into the heating box 8, the heating plate 39 is started, and the wire 3 can be quickly melted by the heating plate 39. At the same time, the cross-section of the heating plate 39 is L-shaped, and the width of the heating plate 39 located on one side of the feed pipe 24 gradually decreases from top to bottom, so that the molten material entering the feed pipe 24 will not always remain in a molten state, which not only avoids the situation where the molten material temperature near the extrusion port is too high and affects the subsequent rapid molding of the product, but also avoids a large amount of waste of electrical energy.

[0050] Preferably, a crank 36 is fixedly connected to the circumferential outer wall of the first rotating column 32, one end of the crank 36 is rotatably connected to a connecting rod 22, and the end of the connecting rod 22 away from the crank 36 is rotatably connected to a connecting plate 20, a rectangular groove 19 is provided on the top outer wall of the heating box 8, a sliding rod 21 is fixedly connected to the bottom of the connecting plate 20, and the outer walls on both sides of the sliding rod 21 are in contact with the inner walls on both sides of the rectangular groove 19, the circumferential outer wall of the shell 1 is fixedly connected to an arc shell 6, and the arc shell 6 is connected to the shell 1, and the scraper assembly includes a rotating frame 44 fixedly connected to the bottom end of the sliding rod 21, both ends of the rotating frame 44 are rotatably connected to a rotating shaft 45, one end of the rotating shaft 45 is fixedly connected to a rotating tube, the circumferential outer wall of the rotating tube is fixedly connected to a push plate 43, and a second spring 52 is fixedly connected to the outer wall of one side of the rotating frame 44, and the end of the second spring 52 away from the rotating frame 44 is connected to the push plate 43 The push plate 43 is fixedly connected and tilted, a baffle 47 is fixedly connected to the circumferential outer wall of the rotating shaft 45, and a baffle ring plate 46 is fixedly connected to the outer wall of one side of the rotating frame 44. During the melting process of the wire 3, since the worm 27 is always in a rotating state, the driving gear 31 can be driven to rotate during the rotation of the worm 27, and the first driven gear 33 can be driven to rotate during the rotation of the driving gear 31. During the rotation of the first driven gear 33, the first rotating column 32 and the second driven gear 35 can be driven to rotate. When the first rotating column 32 rotates, the crank 36 can be driven to rotate together. The rotation of the crank 36 can pull the connecting rod 22 to make a reciprocating motion on the top of the heating box 8. Since the connecting rod 22 is rotationally connected to the connecting plate 20, the sliding rod 21 and the push plate 43 will be driven to reciprocate together during the reciprocating motion of the connecting rod 22.

[0051] Preferably, the circumferential outer walls of the first rotating rod 12 and the second rotating rod 29 are fixedly connected with a rotating disk 13, the circumferential outer wall of the rotating disk 13 is fixedly connected with a protrusion 14, a circular hole is opened on the top outer wall of the heating box 8, a pressure rod 16 is inserted into the inside of the circular hole, a fixed ball 15 is fixedly connected to the end of the pressure rod 16, a circular plate 18 is fixedly connected to the circumferential outer wall of the pressure rod 16, a first spring 17 is fixedly connected to the bottom outer wall of the circular plate 18, and one end of the first spring 17 away from the circular plate 18 is fixedly connected to the top outer wall of the heating box 8. When the push plate 43 is reset to the side away from the feed pipe 24, the fixed connection The rotating disk 13 connected to the outer wall of the first rotating rod 12 and the second rotating rod 29 will drive the protrusion 14 to rotate together to a position in contact with the fixed ball 15. At this time, as the first rotating rod 12 and the second rotating rod 29 continue to rotate, the fixed ball 15 together with the pressure rod 16 will be pressed down. When the pressure rod 16 is subjected to downward pressure, the downward pressure will act on the push plate 43 in an inclined state. At this time, when the push plate 43 is subjected to pressure, the angle between the push plate 43 and the vertical plane will gradually decrease. At this time, the distance between the push plate 43 and the bottom of the heating box 8 will also be reduced, so that the material inside the heating box 8 can be pushed toward the direction of the feed cylinder.

[0052] Preferably, the second gear 25 is meshed with the third gear 37, the third gear 37 is meshed with the fourth gear 38, the circumferential inner wall of the fourth gear 38 is fixedly connected with a rotating rod, the top outer wall of the heating box 8 is fixedly connected with a fixing frame 48, the circumferential outer wall of the rotating rod is fixedly connected with a second bevel gear 53, the second bevel gear 53 is meshed with the first bevel gear 49, the circumferential inner wall of the first bevel gear 49 is fixedly connected with a fourth rotating rod 50, the circumferential outer wall of the fourth rotating rod 50 is fixedly connected with a swing rod 51, the swing rod 51 is located on one side of the wire 3, and can drive the wire 3 to rotate during the rotation of the second gear 25 The third gear 37 rotates together, and the rotation of the third gear 37 can drive the fourth gear 38 to rotate. The fourth gear 38 can drive the rotating rod and the second bevel gear 53 to rotate together, and the second bevel gear 53 is meshed with the first bevel gear 49, so that the first bevel gear 49 and the fourth rotating rod 50 can be rotated. During the rotation of the fourth rotating rod 50, the swing rod 51 can be driven to make a circular motion, so that it can contact the wire 3 located in the heating box 8 to bend it, thereby increasing the contact area between the wire 3 and the heating box 8, thereby improving the melting efficiency of the wire 3.

[0053] In summary, with the help of the above technical solution of the present invention, when the staff needs to perform 3D printing on the product, the motor 5 can be started first, and the worm 27 can be rotated by the motor 5. During the rotation of the worm 27, it will mesh with the worm wheel 28. At this time, the second rotating rod 29 can be driven to rotate by the worm wheel 28. During the rotation of the second rotating rod 29, the second gear 25 and a group of transmission rollers 10 can be driven to rotate. During the rotation of the second gear 25, it will mesh with the first gear 9, thereby driving the first rotating rod 12 and another group of transmission rollers 10 to rotate. Since the first gear 9 and the second gear 25 are meshed, the rotation directions of the two groups of transmission rollers 10 are opposite, and the conveyor belts 11 arranged on the outer walls of the two groups of transmission rollers 10 are The wire 3 is in contact with the circumferential outer wall of the wire 3, and the friction between the conveyor belt 11 and the wire 3 can realize the conveying work of the wire 3, so that the wire 3 can be stably fed into the heating box 8 for subsequent heating and melting. When the wire 3 is fed into the heating box 8, the heating plate 39 is started, and the wire 3 can be quickly melted by the heating plate 39. At the same time, the cross-section of the heating plate 39 is L-shaped, and the width of the heating plate 39 on one side of the feed pipe 24 gradually decreases from top to bottom, so that the molten material entering the feed pipe 24 will not always remain in a molten state, which not only avoids the situation where the temperature of the molten material near the extrusion port is too high to affect the subsequent rapid molding of the product, but also avoids a large amount of waste of electric energy. In the process of melting the wire 3, due to the worm 27 is always in a rotating state. During the rotation of the worm 27, the driving gear 31 can be driven to rotate. During the rotation of the driving gear 31, the first driven gear 33 can be driven to rotate. During the rotation of the first driven gear 33, the first rotating column 32 and the second driven gear 35 can be driven to rotate. When the first rotating column 32 rotates, the crank 36 can be driven to rotate together. The rotation of the crank 36 can pull the connecting rod 22 to make a reciprocating motion on the top of the heating box 8. Since the connecting rod 22 is rotatably connected to the connecting plate 20, the sliding rod 21 and the push plate 43 will be driven to reciprocate together during the reciprocating motion of the connecting rod 22. Since the push plate 43 is always in a tilted state due to the action of the spring, the push plate 43 can be prevented from being pushed back. During the process, the molten wire 3 inside the heating box 8 is pushed back to one side thereof for accumulation. When the push plate 43 is reset to the side away from the feeding pipe 24, the rotating disk 13 fixedly connected to the outer wall of the circumference of the first rotating rod 12 and the second rotating rod 29 will drive the protrusion 14 to rotate together to a position in contact with the fixed ball 15. At this time, as the first rotating rod 12 and the second rotating rod 29 continue to rotate, the fixed ball 15 together with the pressure rod 16 will be pressed down. When the pressure rod 16 is subjected to downward pressure, the downward pressure will act on the push plate 43 in an inclined state. At this time, when the push plate 43 is subjected to pressure, the angle between the push plate 43 and the vertical plane will gradually decrease. At this time, the distance between the push plate 43 and the bottom of the heating box 8 will also be reduced, so that the material inside the heating box 8 can be pushed toward the feeding tube.When the protrusion 14 rotates with the rotating disk 13 and separates from the fixed ball 15, the material accumulated on one side of the push plate 43 accumulates more and more. At this time, the push plate 43 moves together with the connecting rod 22, so that the material can be quickly pushed into the feeding cylinder, which is convenient for the subsequent rapid extrusion of the molten material of the wire 3, avoiding the temporary shortage of the molten material during the subsequent printing process. Finally, the third driven gear 41 drives the third rotating rod 42 and the spiral feeding tube 40 to rotate together, so that the molten material can be quickly extruded from the extrusion head 7 for printing.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A material hot melt extrusion device for 3D printing, comprising a housing (1), characterized in that: The top outer wall of the shell (1) is fixedly connected to a mounting seat (2), the top outer wall of the shell (1) is fixedly connected to a first guide tube (4), and the wire (3) passes through the inside of the first guide tube (4); A feeding assembly for conveying the wire material (3) is arranged inside the housing (1); A melting material assembly for melting the wire material (3) is arranged inside the housing (1), the melting material assembly is arranged below the feeding assembly, a heating box (8) is fixedly connected to the inside of the housing (1), and the melting material assembly is arranged inside the heating box (8); The molten material assembly comprises a heating plate (39) arranged inside the heating box (8); a controller (26) is fixedly connected to an outer wall of one side of the shell (1); the controller (26) is electrically connected to the heating plate (39); A scraper assembly is provided inside the heating box (8); The top outer wall of the housing (1) is fixedly connected to a motor (5), the output end of the motor (5) is fixedly connected to a worm (27), the bottom end of the worm (27) is fixedly connected to a vertical column, the circumferential outer wall of the vertical column is fixedly connected to a driving gear (31), one side inner wall of the housing (1) is fixedly connected to a fixing seat (30), the vertical column is rotatably connected to the fixing seat (30), the driving gear (31) is meshed with a first driven gear (33), the circumferential inner wall of the first driven gear (33) is fixedly connected to a first rotating column (32), one end of the first rotating column (32) is rotatably connected to the fixing seat (30), the circumferential outer wall of the first rotating column (32) is fixedly connected to a second driven gear (35), the second driven gear (35 ... the first driven gear (35) is meshed with a first driven gear (33), the circumferential inner wall of the first driven gear (33) is fixedly connected to a first rotating column (32), the first driven gear (35) is meshed with a first driven gear (33), the first driven gear (33) is meshed with a first driven gear (33), the first driven gear (33) is meshed with a first driven gear (33), the first driven gear (33) is meshed with a first driven gear (3 (35) is meshed with a third driven gear (41), the circumferential inner wall of the third driven gear (41) is fixedly connected to a third rotating rod (42), the bottom end of the third rotating rod (42) is fixedly connected to a spiral feeding pipe (40), the cross section of the heating box (8) is L-shaped, a feeding pipe (24) is arranged inside the heating box (8), the spiral feeding pipe (40) is located inside the feeding pipe (24), a conical head (23) is arranged at the bottom of the feeding pipe (24), the conical head (23) is threadedly connected to an extrusion head (7), a gear box (34) is fixedly connected to an inner wall of one side of the housing (1), and the second driven gear (35) and the third driven gear (41) are both located inside the gear box (34); The worm (27) is meshed with a worm wheel (28), and a second rotating rod (29) is fixedly connected to the circumferential inner wall of the worm wheel (28); The feeding assembly comprises a second gear (25) fixedly connected to the circumferential outer wall of the second rotating rod (29), the second gear (25) meshing with the first gear (9), the circumferential inner wall of the first gear (9) fixedly connected to the first rotating rod (12), both ends of the first rotating rod (12) and the second rotating rod (29) are rotatably connected to the inner walls of both sides of the housing (1), the circumferential outer walls of the first rotating rod (12) and the second rotating rod (29) are fixedly connected to a transmission roller (10), the circumferential outer wall of the transmission roller (10) is provided with an annular groove, the circumferential inner wall of the annular groove is bonded with a conveyor belt (11), the circumferential outer wall of the conveyor belt (11) is provided with arc grooves distributed in a circular shape at equal distances, and the circumferential outer wall of the conveyor belt (11) is in contact with the wire (3); The circumferential outer wall of the first rotating column (32) is fixedly connected to a crank (36), one end of the crank (36) is rotatably connected to a connecting rod (22), and one end of the connecting rod (22) away from the crank (36) is rotatably connected to a connecting plate (20), a rectangular groove (19) is provided on the top outer wall of the heating box (8), a sliding rod (21) is fixedly connected to the bottom of the connecting plate (20), and both side outer walls of the sliding rod (21) are in contact with both side inner walls of the rectangular groove (19), and the circumferential outer wall of the shell (1) is fixedly connected to an arc shell (6), and the arc shell (6) is connected to the shell (1); The scraper assembly comprises a rotating frame (44) fixedly connected to the bottom end of the slide rod (21), both ends of the rotating frame (44) are rotatably connected to a rotating shaft (45), one end of the rotating shaft (45) is fixedly connected to a rotating tube, the circumferential outer wall of the rotating tube is fixedly connected to a push plate (43), one side outer wall of the rotating frame (44) is fixedly connected to a second spring (52), one end of the second spring (52) away from the rotating frame (44) is fixedly connected to the push plate (43), the push plate (43) is arranged in an inclined manner, the circumferential outer wall of the rotating shaft (45) is fixedly connected to a baffle (47), and one side outer wall of the rotating frame (44) is fixedly connected to a baffle ring plate (46); The circumferential outer walls of the first rotating rod (12) and the second rotating rod (29) are fixedly connected to a rotating disk (13), the circumferential outer wall of the rotating disk (13) is fixedly connected to a protrusion (14), a circular hole is opened on the top outer wall of the heating box (8), a pressure rod (16) is inserted into the inside of the circular hole, and a fixed ball (15) is fixedly connected to the end of the pressure rod (16).

2. A material hot melt extrusion device for 3D printing according to claim 1, characterized in that: The cross section of the heating plate (39) is L-shaped, and the width of the heating plate (39) located on one side of the material conveying pipe (24) gradually decreases from top to bottom. The heating box (8) is connected to the material conveying pipe (24).

3. A material hot melt extrusion device for 3D printing according to claim 1, characterized in that: The circumferential outer wall of the pressure rod (16) is fixedly connected to a circular plate (18), the bottom outer wall of the circular plate (18) is fixedly connected to a first spring (17), and one end of the first spring (17) away from the circular plate (18) is fixedly connected to the top outer wall of the heating box (8).

4. A material hot melt extrusion device for 3D printing according to claim 3, characterized in that: The second gear (25) is meshed with a third gear (37), the third gear (37) is meshed with a fourth gear (38), a rotating rod is fixedly connected to the circumferential inner wall of the fourth gear (38), and a fixing frame (48) is fixedly connected to the top outer wall of the heating box (8).

5. A material hot melt extrusion device for 3D printing according to claim 4, characterized in that: A second bevel gear (53) is fixedly connected to the circumferential outer wall of the rotating rod, the second bevel gear (53) is meshed with the first bevel gear (49), a fourth rotating rod (50) is fixedly connected to the circumferential inner wall of the first bevel gear (49), a swing rod (51) is fixedly connected to the circumferential outer wall of the fourth rotating rod (50), and the swing rod (51) is located on one side of the wire (3).

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