A municipal road design device based on 3D printing

Abstract

The present invention discloses a municipal road design device based on 3D printing, which relates to the field of 3D printing technology, including a printer, the printer including a main frame, a linear rail, an extrusion unit and a platform, the main frame is equipped with a linear rail, and the linear rail is driven by a motor, the linear rail is used to control the movement of the platform and the extrusion unit, the extrusion unit is used to melt the wire and extrude it from the nozzle to the platform for printing, and a dredging mechanism is arranged under the nozzle. The present invention aims to improve the problem that when a municipal road design is printed and displayed by a 3D printer in the prior art, the nozzle is blocked due to the solidification of the cooled consumables in the nozzle, and the staff is required to manually disassemble the nozzle and then dredge the nozzle, which makes the dredging of the nozzle more laborious. The present invention has the advantages that when the blocked nozzle is dredged, the nozzle can be automatically controlled to be interspersed and dredged, making the dredging of the nozzle more convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and in particular to a municipal road design device based on 3D printing. Background Art

[0002] Municipal road design includes: urban road traffic characteristics, urban road system planning, cross-section design, plane and longitudinal section linear design, intersection design, pavement structure design, urban road drainage, public facilities and urban ring roads, etc. In municipal road design, 3D printing is often required. Through 3D printing display models, the design effect can be more intuitively displayed. When printing with a 3D printer, after the 3D printer is finished printing, the cooled consumables will solidify in the nozzle, causing the consumables to be unable to be squeezed out during printing, thereby affecting the printing work. The staff is required to manually disassemble the nozzle and unclog the nozzle, which makes the nozzle unclogging more laborious.

[0003] In view of the above technical problems, the present invention discloses a municipal road design device based on 3D printing. The present invention has the advantages of being able to automatically control the nozzles to be interlaced and dredged when the blocked nozzles are being unblocked, making the unblocking of the nozzles more convenient. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a municipal road design device based on 3D printing to solve the technical problems in the prior art that when a municipal road design display model is printed by a 3D printer, the cooled consumables solidify inside the nozzle, causing the nozzle to be blocked, and the staff needs to manually disassemble the nozzle to unclog the nozzle, making the unclogging of the nozzle more laborious. The present invention has the advantages of automatically controlling the nozzle to be interspersed and dredged when unclogging the blocked nozzle, making the dredging of the nozzle more convenient.

[0005] The present invention is implemented by the following technical scheme: The present invention discloses a municipal road design device based on 3D printing, including a printer, the printer including a main frame, a linear rail, an extrusion unit and a platform, the main frame is equipped with a linear rail, and the linear rail is driven by a motor, the linear rail is used to control the movement of the platform and the extrusion unit, the extrusion unit is used to melt the wire and extrude it from the nozzle onto the platform for printing, a dredging mechanism is arranged below the nozzle, and the dredging mechanism is swingably folded and arranged below the nozzle through a connecting component;

[0006] The dredging mechanism includes a fixed cylinder, a ejector pin and a longitudinal movement assembly. The fixed cylinder is arranged below the nozzle through a connecting assembly. An ejector pin is arranged inside the fixed cylinder, and the diameter of the ejector pin is adapted to the inner diameter of the spray hole of the nozzle. A through hole is opened on the top wall of the fixed cylinder for making way for the ejector pin. The longitudinal movement assembly is used to control the longitudinal movement of the ejector pin, and the longitudinal movement assembly is arranged as a screw structure.

[0007] Furthermore, the longitudinal movement assembly includes a screw rod, a movable disk and a driving assembly. A screw rod is arranged inside the fixed cylinder, and the two ends of the screw rod are rotatably connected to the top wall and the bottom wall of the fixed cylinder respectively. Two screw rods are arranged on both sides of the fixed cylinder. A movable disk is also arranged inside the fixed cylinder. The movable disk is threadedly connected to the screw rod through a threaded hole, and the bottom end of the ejector pin is connected to the movable disk. The rotation of the screw rod is driven by the driving assembly.

[0008] Furthermore, a sliding rod is fixedly arranged inside the fixed cylinder, a sliding hole is opened inside the movable plate, and the sliding rod is slidably plugged into and matched with the sliding hole.

[0009] Furthermore, the driving assembly includes a mounting cylinder, a driving motor, a transmission shaft and a gear set. The mounting cylinder is fixedly arranged below the fixed cylinder, the driving motor is installed on the outer wall of the mounting cylinder, and a transmission shaft is laterally arranged inside the mounting cylinder, the two ends of the transmission shaft are respectively rotatably connected to the inner walls on both sides of the mounting cylinder, the transmission shaft is transmission-connected to the output end of the driving motor, the bottom end of the screw rod extends to the interior of the mounting cylinder, and one end of the screw rod located inside the mounting cylinder is transmission-connected to the transmission shaft through the gear set.

[0010] Furthermore, the connection between the ejector pin and the movable disk is arranged as an elastic connection, a plug-in hole 1 is opened at the center of the movable disk, an outer cylinder is fixedly arranged below the movable disk, the bottom end of the ejector pin is slidably inserted in the inside of the plug-in hole 1 and extends to the inside of the outer cylinder through the plug-in hole 1, a limit disk is fixedly arranged at one end of the ejector pin located inside the outer cylinder, a partition is fixedly arranged inside the outer cylinder, a plug-in rod is also fixedly arranged below the limit disk at the bottom end of the ejector pin, and a plug-in hole 2 is also opened at the center of the partition, the bottom end of the plug-in rod is slidably inserted in the inside of the plug-in hole 2 and extends to the bottom of the partition through the plug-in hole 2, a positioning disk is arranged at one end of the plug-in rod located below the partition, a spring is sleeved on the outer wall of the part of the plug-in rod located above the partition, and the two ends of the spring are respectively in contact with the partition and the limit disk.

[0011] Furthermore, a heating component for heating the ejector pin is arranged inside the fixing cylinder.

[0012] Furthermore, the heating component includes an electric heating coil and a starting component. The electric heating coil is installed inside the fixed cylinder and is sleeved on the outside of the ejector pin. The starting of the electric heating coil is controlled by the starting component. The starting component is configured so that when the ejector pin cannot push the blockage inside the nozzle, the heating component starts after the ejector pin compresses the spring downward.

[0013] Furthermore, the starting assembly includes an insulating column, a contact piece and a contact rod. The insulating column is fixedly arranged at the bottom of the outer cylinder, and a contact piece is fixedly arranged above the insulating column. The contact piece is located below the partition, and the contact piece is connected to an external power supply through a wire. A contact rod is arranged above the contact piece, and there is a distance between the contact rod and the contact piece. The contact rod is fixedly arranged below the positioning plate, and the contact rod and the contact piece are both conductors. The positioning plate is an insulator, and the electric heating coil is electrically connected to the contact rod through a wire.

[0014] Furthermore, the connecting component includes a connecting disk, a connecting rod and a rotating component. The connecting disk is fixedly sleeved on the outside above the printer throat. The two sides of the connecting disk are rotatably connected with connecting rods, and the other end of the connecting rod is fixedly connected to the fixed cylinder. The rotation of the connecting rod is driven and controlled by the rotating component. The rotating component includes a motor part and a gear transmission part. The motor part is used to drive the gear transmission part, and the gear transmission part is used to make the output shaft of the motor part and the connecting rod be transmission-connected.

[0015] The present invention has the following advantages:

[0016] The present invention provides a dredging mechanism. When the 3D printer is finished printing, the cooled consumable solidifies in the nozzle, thereby causing the consumable to clog the nozzle and make it impossible to extrude during printing. Therefore, by providing the dredging mechanism, the lead screw can be driven to rotate by the driving motor, thereby controlling the ejector pin to move upward, and the nozzle is dredged by the ejector pin, thereby realizing automatic dredging and making the dredging work more convenient. In addition, by arranging the ejector pin and the movable disk to be elastically connected, so that when the ejector pin is moved upward and inserted into the nozzle to dredge the nozzle, when the blockage is tight, in order to prevent the ejector pin from being deformed by hard pressure, the spring is provided so that when the strength of the ejector pin is insufficient to eject the blockage, the ejector pin can compress the spring, thereby preventing the ejector pin from being damaged. At the same time, by providing a heating component, the heating component can be started immediately after the ejector pin compresses the spring, thereby heating the ejector pin, and the solidified blockage is melted by the heated ejector pin, thereby melting and dredging the tight blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 For the present invention Figure 1 A local enlarged structural schematic diagram;

[0019] Figure 3 It is a schematic diagram of the structure of the dredging mechanism of the present invention;

[0020] Figure 4 It is a schematic diagram of the internal structure of the fixing cylinder of the present invention;

[0021] Figure 5 It is a schematic diagram of the internal structure of the outer cylinder of the present invention;

[0022] Figure 6 It is a schematic diagram of the top view structure of the partition of the present invention.

[0023] In the figure: 1. printer; 2. dredging mechanism; 3. connecting component; 4. through hole; 5. threaded hole; 6. slide rod; 7. slide hole; 8. plug hole 1; 9. limit plate; 10. partition; 11. plug rod; 12. plug hole 2; 13. positioning plate; 14. spring; 15. heating component; 16. outer cylinder; 17. wire; 101. main frame; 102. linear rail; 103. extrusion unit; 104. platform; 201. fixed cylinder; 202 , ejector pin; 203, longitudinal movement assembly; 231, screw rod; 232, moving disk; 233, driving assembly; 331, mounting cylinder; 332, driving motor; 333, transmission shaft; 334, gear set; 151, electric heating coil; 152, starting assembly; 521, insulating column; 522, contact piece; 523, contact rod; 301, connecting disk; 302, connecting rod; 303, rotating assembly; 3031, motor unit; 3032, gear transmission unit. DETAILED DESCRIPTION

[0024] The following is a detailed description of an embodiment of the present invention. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and a specific operation process are given. However, the protection scope of the present invention is not limited to the following embodiments. In the description of the present invention, words indicating directions or positional relationships such as "front", "rear", "left", and "right" are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0025] The embodiment discloses a municipal road design device based on 3D printing, such as Figure 1-Figure 6 As shown, the printer 1 includes a main frame 101, a linear rail 102, an extrusion unit 103 and a platform 104, wherein Figure 1 and Figure 2As shown, a wire track 102 is installed on the main frame 101, and the wire track 102 is driven by a motor. The wire track 102 is used to control the movement of the platform 104 and the extrusion unit 103, and the extrusion unit 103 is used to melt the wire and extrude it from the nozzle to the platform 104 for printing. In actual operation, after shutdown, the melted wire remaining inside the nozzle will cool and solidify, thereby blocking the nozzle. In order to dredge the nozzle, a dredging mechanism 2 is provided below the nozzle, and the dredging mechanism 2 is swingably installed below the nozzle through a connecting component 3, so that during normal printing, the dredging mechanism 2 can be folded and stored above one side of the nozzle to avoid the dredging mechanism 2 affecting the printing work. When dredging work is required, the dredging mechanism 2 is moved to the bottom of the nozzle through the connecting component 3 to dredge the nozzle.

[0026] Dredging mechanism 2, such as Figure 2-Figure 4 As shown, the dredging mechanism 2 includes a fixed cylinder 201, an ejector pin 202 and a longitudinal moving assembly 203, wherein the fixed cylinder 201 is foldably arranged below the nozzle through the connecting assembly 3, an ejector pin 202 is arranged inside the fixed cylinder 201, and the diameter of the ejector pin 202 is adapted to the inner diameter of the nozzle orifice. Specifically, the outer wall of the ejector pin 202 is slidably plugged into the inner wall of the nozzle orifice, so that when the ejector pin 202 is inserted into the nozzle orifice, the blockage inside the nozzle orifice can be ejected, and a through hole 4 is opened on the top wall of the fixed cylinder 201, and the top end of the ejector pin 202 passes through the fixed cylinder 201 through the through hole 4. The top wall of the fixed cylinder 201 extends to the outside of the fixed cylinder 201, and the up and down movement of the ejector pin 202 is controlled by the longitudinal movement component 203, so that when the nozzle needs to be dredged, the fixed cylinder 201 is moved to the bottom of the nozzle through the connecting component 3, and then the ejector pin 202 is moved upward by the longitudinal movement component 203, so that the ejector pin 202 is moved to the outside of the fixed cylinder 201 through the through hole 4, and the top end of the ejector pin 202 is inserted into the inside of the nozzle hole of the nozzle. With the control of the longitudinal movement component 203, the ejector pin 202 moves from bottom to top toward the inside of the nozzle, so as to penetrate and dredge the nozzle;

[0027] The longitudinal movement assembly 203 is configured as a screw rod structure, so that the longitudinal movement of the ejector pin 202 is more stable. Specifically, the longitudinal movement assembly 203 includes a screw rod 231, a movable plate 232 and a driving assembly 233, wherein a screw rod 231 is disposed inside the fixed cylinder 201, and the two ends of the screw rod 231 are rotatably connected to the top wall and the bottom wall of the fixed cylinder 201, respectively, and two screw rods 231 are provided, and the two screw rods 231 are respectively disposed on both sides of the fixed cylinder 201. A movable disk 232 is further provided inside the fixed cylinder 201, and a threaded hole 5 is provided inside the movable disk 232. The movable disk 232 is threadedly connected to the screw rod 231 through the threaded hole 5. The bottom end of the ejector pin 202 is connected to the movable disk 232. The rotation of the screw rod 231 is driven by the driving assembly 233, and then the screw rod 231 is controlled to rotate by the driving assembly 233, so that the screw rod 231 controls the movable disk 232 to move up and down, and then controls the ejector pin 202 to move up and down.

[0028] In addition, a slide bar 6 is fixedly arranged inside the fixed cylinder 201, and correspondingly, a slide hole 7 is opened inside the movable plate 232, and the slide bar 6 and the slide hole 7 are slidably plugged into each other, thereby limiting the upward and downward movement of the movable plate 232 through the cooperation between the slide bar 6 and the slide hole 7;

[0029] The driving assembly 233 includes a mounting cylinder 331, a driving motor 332, a transmission shaft 333 and a gear set 334, wherein the mounting cylinder 331 is fixedly arranged below the fixed cylinder 201, and the driving motor 332 is installed on the outer wall of the mounting cylinder 331, and the transmission shaft 333 is transversely arranged inside the mounting cylinder 331, and the two ends of the transmission shaft 333 are respectively rotatably connected to the inner walls on both sides of the mounting cylinder 331, and the mounting cylinder 331 is transmission-connected to the output end of the driving motor 332, in addition, the bottom end of the screw rod 231 extends to the inside of the mounting cylinder 331, and one end of the screw rod 231 located inside the mounting cylinder 331 is transmission-connected to the transmission shaft 333 through the gear set 334, and then the transmission shaft 333 is driven to rotate by the driving motor 332, and the screw rod 231 is rotated through the gear set 334;

[0030] More specifically, the gear set 334 is composed of two bevel gear sets 334 meshing with each other, and the two bevel gears are perpendicular to each other, and the two bevel gears are fixedly connected to the bottom end of the screw rod 231 and the transmission shaft 333 respectively;

[0031] Considering that when the ejector pin 202 is used to dredge the inside of the nozzle, the filaments that are solidified and clogged inside the nozzle may be tight, which may cause the ejector pin 202 to be inserted into the nozzle hole and push upward. Since the ejector pin 202 is thin, the ejector pin 202 is subjected to a large pressure and deformed, which affects the dredging work. Therefore, the connection between the ejector pin 202 and the movable disk 232 is set to be an elastic connection;

[0032] Specifically, Figure 4 , Figure 5 and Figure 6 As shown, a plug hole 8 is opened at the center of the movable disk 232, and the bottom end of the ejector pin 202 is slidably plugged into the inside of the plug hole 8, and the bottom end of the ejector pin 202 extends to the bottom of the movable disk 232, and a limit plate 9 is fixedly provided at one end of the ejector pin 202 located below the movable disk 232, so that the ejector pin 202 and the movable disk 232 are plugged together. In addition, an outer cylinder 16 is provided below the movable disk 232, and the limit plate 9 at the bottom end of the ejector pin 202 is located inside the outer cylinder 16, and a partition plate 10 is fixedly provided inside the outer cylinder 16, and a plug rod 11 is also fixedly provided below the limit plate 9 at the bottom end of the ejector pin 202, and the partition plate 10 is fixedly provided inside the outer cylinder 16. A second plug hole 12 is also provided at the center of 10, and the bottom end of the plug rod 11 is slidably plugged into the second plug hole 12 and extends through the second plug hole 12 to the bottom of the partition 10. The plug rod 11 is provided with a positioning plate 13 below the partition 10, and the outer wall of the plug rod 11 above the partition 10 is sleeved with a spring 14, and the two ends of the spring 14 are respectively in contact with the partition 10 and the limit plate 9, and then the spring 14 is used to elastically support the ejector pin 202, so that when the ejector pin 202 is inserted into the nozzle and encounters a large resistance, the spring 14 can be compressed to prevent the ejector pin 202 from being directly subjected to hard pressure, causing the ejector pin 202 to deform;

[0033] In actual operation, by selecting the elastic force of the spring 14, when the ejector pin 202 is subjected to a large pressure when moving upward to penetrate and dredge the nozzle, the spring 14 can be compressed, thereby preventing the ejector pin 202 from deforming. Therefore, when it is necessary to dredge the nozzle, the driving motor 332 is started to rotate the screw rod 231 to control the upward movement of the movable plate 232. The upward movement of the movable plate 232 drives the outer cylinder 16 to move upward, and then the ejector pin 202 is moved upward by the support of the spring 14. The ejector pin 202 is inserted into the nozzle hole for dredging. The ejector pin 202 can push out the blockage inside the nozzle and dredge it. When the blockage inside the nozzle is tight, the pressure on the ejector pin 202 is greater than the strength of the ejector pin 202, and the ejector pin 202 moves downward to compress the spring 14, thereby preventing the ejector pin 202 from deforming and breaking.

[0034] When the blockage is tight and the nozzle cannot be unblocked, the blockage inside the nozzle is generally solidified consumables. Figure 3-Figure 5As shown, a heating component 15 is provided inside the fixed cylinder 201. By providing the heating component 15 inside the fixed cylinder 201 to heat the ejector pin 202, when the ejector pin 202 cannot push the consumables blocked inside the nozzle, the ejector pin 202 can be automatically heated, and the consumables inside the nozzle are melted by the heated ejector pin 202, so that the dredging is more effective.

[0035] The heating component 15 includes an electric heating coil 151 and a starting component 152, wherein the electric heating coil 151 is installed inside the fixed cylinder 201, and the electric heating coil 151 is sleeved outside the ejector pin 202, so that the electric heating coil 151 can heat the ejector pin 202 of the inner circle when it is started, and the start of the electric heating coil 151 is controlled by the starting component 152. It should be noted that when the nozzle is unblocked by the ejector pin 202, the tightness of the blockage is random. In other words, the tightness of the blockage at the nozzle is sometimes tight and sometimes loose. In order to save energy and save operating costs, it is necessary to start the nozzle when the blockage is relatively tight. When the blockage is tight, the heating component 15 is started to heat the ejector pin 202, so as to avoid energy waste caused by heating each time the ejector pin 202 is unblocked. Then, the starting component 152 is set such that when the ejector pin 202 cannot push the blockage inside the nozzle, the ejector pin 202 compresses the spring 14 downward, and then the heating component 15 is started. Then, under normal circumstances, when the ejector pin 202 easily pushes out the blockage of the nozzle, the heating component 15 is turned off. Only when the blockage is tight and the ejector pin 202 is not strong enough to push out the blockage, the heating component 15 is started, so that the ejector pin 202 heats up to melt the blockage inside the nozzle orifice, thereby easily unblocking the nozzle.

[0036] The starting component 152 includes an insulating column 521, a contact piece 522 and a contact rod 523, wherein an insulating column 521 is fixedly arranged at the bottom of the outer cylinder 16, and the insulating column 521 is located below the partition 10, and a contact piece 522 is fixedly arranged above the insulating column 521, and the contact piece 522 is also located below the partition 10, and the contact piece 522 is connected to the external power supply through the wire 17, and accordingly, a contact rod 523 is arranged above the contact piece 522, and there is a distance between the contact rod 523 and the contact piece 522, and the contact rod 523 is fixedly connected to the positioning disk 13 at one end of the plug-in rod 11 below the partition 10. It should be noted that the contact rod 523 and the contact piece 522 are both conductors, and the positioning disk 13 is an insulator. In addition, the electric heating coil 151 is electrically connected to the contact rod 523 through the wire 17. Therefore, when the movable disk 232 moves up with the operation of the screw rod 231, the ejector pin 202 is moved up and inserted into the nozzle hole for dredging. When the internal blockage is tight, the ejector pin 202 compresses the spring 14 as the movable plate 232 continues to move up, so as to prevent the ejector pin 202 from being deformed by the hard pressure. At the same time, the bottom end of the plug rod 11 gradually approaches the contact piece 522. When the contact rod 523 at the bottom end of the plug rod 11 contacts the contact piece 522, the electric heating coil 151 is energized to heat the ejector pin 202. When the ejector pin 202 is heated, the high temperature of the ejector pin 202 melts the solidified blockage inside the nozzle, and the ejector pin 202 is gradually inserted into the nozzle by the elastic force of the spring 14 to dredge the nozzle. At the same time, after the ejector pin 202 is moved up by the elastic force of the spring 14, the contact rod 523 is separated from the contact piece 522, and the electric heating coil 151 is powered off, so that after the ejector pin 202 is heated and the solidified material inside the nozzle is melted, the power can be automatically turned off, thereby closing the electric heating coil 151.

[0037] Connect component 3, such as Figure 1-Figure 3As shown, the connection assembly 3 includes a connection disk 301, a connection rod 302 and a rotation assembly 303, wherein the external fixed sleeve above the throat of the printer 1 is connected with the connection disk 301, and the two sides of the connection disk 301 are respectively rotatably connected with the connection rods 302, and the other end of the connection rod 302 is fixedly connected to the fixed cylinder 201, and the connection rods 302 on both sides of the fixed cylinder 201 form a square frame, and then the fixed cylinder 201 can be swung by rotating the connection rod 302, so that the fixed cylinder 201 swings to the side of the throat above the nozzle, so as to avoid the fixed cylinder 201 affecting the printing work, and the rotation of the connection rod 302 is The rotating component 303 is driven and controlled. The rotating component 303 includes a motor part 3031 and a gear transmission part 3032. The motor part 3031 is installed at the extrusion unit 103, and the gear transmission part 3032 is composed of two gear sets 334 meshing with each other, one of which is fixedly sleeved on the outer wall of the connecting rod 302, and the other gear is fixedly connected to the output end of the motor part 3031. Then, by starting the motor part 3031, the motor part 3031 controls the gear to rotate, and the connecting rod 302 is rotated by a certain angle through the gear, so that the fixed cylinder 201 moves to the bottom of the nozzle and then the nozzle is cleared.

[0038] The principle of the present invention is as follows: the present invention is provided with a dredging mechanism 2, and then after the nozzle is blocked, the motor part 3031 can be started to control the gear to rotate, and the connecting rod 302 can be rotated by a certain angle through the gear, so that the fixed cylinder 201 moves to the bottom of the nozzle and then the nozzle is dredged, and then the driving motor 332 is started, and the driving motor 332 drives the transmission shaft 333 to rotate, and the screw rod 231 is rotated through the gear set 334, and the screw rod 231 controls the moving disk 232 to move up and down, and then controls the ejector pin 202 to move up and down, and by moving the ejector pin 202 upward, the ejector pin 202 can be inserted into the nozzle hole of the nozzle to dredge the nozzle hole, and when the solidified material inside the nozzle hole is tightly blocked, when the ejector pin 202 is subjected to greater pressure when moving upward to penetrate and dredge the nozzle, the spring 14 The ejector pin 202 is pressed against the nozzle 202 by the spring 14 and the ejector pin 202 is pressed against the nozzle 202.

[0039] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A municipal road design device based on 3D printing, comprising a printer (1), characterized in that: The printer (1) comprises a main frame (101), a linear rail (102), an extrusion unit (103) and a platform (104); the main frame (101) is provided with a linear rail (102), and the linear rail (102) is driven by a motor; the linear rail (102) is used to control the movement of the platform (104) and the extrusion unit (103); the extrusion unit (103) is used to melt the wire and extrude it from a nozzle onto the platform (104) for printing; a dredging mechanism (2) is provided below the nozzle, and the dredging mechanism (2) is provided below the nozzle in a swingable and foldable manner through a connecting component (3); The dredging mechanism (2) comprises a fixed cylinder (201), an ejector pin (202) and a longitudinal movement assembly (203); the fixed cylinder (201) is arranged below the nozzle via a connecting assembly (3); an ejector pin (202) is arranged inside the fixed cylinder (201); and the diameter of the ejector pin (202) matches the inner diameter of the nozzle hole; a through hole (4) is provided on the top wall of the fixed cylinder (201) for making way for the ejector pin (202); the longitudinal movement assembly (203) is used for controlling the longitudinal movement of the ejector pin (202); and the longitudinal movement assembly (203) is arranged as a screw rod structure; The longitudinal movement assembly (203) comprises a screw rod (231), a movable disk (232) and a driving assembly (233); a screw rod (231) is arranged inside the fixed cylinder (201), and the two ends of the screw rod (231) are rotatably connected to the top wall and the bottom wall of the fixed cylinder (201) respectively; two screw rods (231) are arranged, and the two screw rods (231) are arranged on both sides inside the fixed cylinder (201); a movable disk (232) is also arranged inside the fixed cylinder (201); the movable disk (232) is threadedly connected to the screw rod (231) through a threaded hole (5); the bottom end of the ejector pin (202) is connected to the movable disk (232); and the rotation of the screw rod (231) is driven by the driving assembly (233); A sliding rod (6) is also fixedly arranged inside the fixed cylinder (201), a sliding hole (7) is provided inside the movable plate (232), and the sliding rod (6) and the sliding hole (7) are slidably plugged into each other; The driving assembly (233) comprises a mounting cylinder (331), a driving motor (332), a transmission shaft (333) and a gear set (334); the mounting cylinder (331) is fixedly arranged below the fixed cylinder (201); the driving motor (332) is mounted on the outer wall of the mounting cylinder (331); a transmission shaft (333) is transversely arranged inside the mounting cylinder (331); two ends of the transmission shaft (333) are respectively rotatably connected to the inner walls on both sides of the mounting cylinder (331); the transmission shaft (333) is transmission-connected to the output end of the driving motor (332); the bottom end of the screw rod (231) extends into the interior of the mounting cylinder (331); and one end of the screw rod (231) located inside the mounting cylinder (331) is transmission-connected to the transmission shaft (333) via the gear set (334); The connection between the ejector pin (202) and the movable disk (232) is arranged to be elastically connected. A plug hole (8) is provided at the center of the movable disk (232). An outer cylinder (16) is fixedly arranged below the movable disk (232). The bottom end of the ejector pin (202) is slidably plugged into the inside of the plug hole (8) and passes through the plug hole (8) to extend into the inside of the outer cylinder (16). A limit plate (9) is fixedly arranged at one end of the ejector pin (202) located inside the outer cylinder (16). A partition plate (10) is fixedly arranged inside the outer cylinder (16). A plug rod (11) is also fixedly arranged below the limit plate (9) at the bottom end of the ejector pin (202). 11), and a second plug hole (12) is also provided at the center of the partition (10), the bottom end of the plug rod (11) is slidably plugged into the inside of the second plug hole (12) and extends through the second plug hole (12) to the bottom of the partition (10), a positioning plate (13) is provided at one end of the plug rod (11) located below the partition (10), a spring (14) is sleeved on the outer wall of the plug rod (11) located above the partition (10), and the two ends of the spring (14) are respectively in contact with the partition (10) and the limit plate (9), and a heating component (15) for heating the ejector pin (202) is provided inside the fixing cylinder (201); The heating component (15) comprises an electric heating coil (151) and a starting component (152); the electric heating coil (151) is installed inside the fixed cylinder (201), and the electric heating coil (151) is sleeved outside the ejector pin (202); the starting of the electric heating coil (151) is controlled by the starting component (152); the starting component (152) is configured such that when the ejector pin (202) is unable to push the blockage inside the nozzle, the ejector pin (202) compresses the spring (14) downward, and then the heating component (15) is started; The starting component (152) comprises an insulating column (521), a contact piece (522) and a contact rod (523); the bottom of the outer cylinder (16) is fixedly provided with an insulating column (521); the upper part of the insulating column (521) is fixedly provided with a contact piece (522), and the contact piece (522) is located below the partition (10); the contact piece (522) is connected to an external power source via a wire (17); the upper part of the contact piece (522) is provided with a contact rod (523), and there is a distance between the contact rod (523) and the contact piece (522); the contact rod (523) is fixedly provided below the positioning plate (13); the contact rod (523) and the contact piece (522) are both conductors; the positioning plate (13) is an insulator; and the electric heating coil (151) is electrically connected to the contact rod (523) via a wire (17).

2. A municipal road design device based on 3D printing as claimed in claim 1, characterized in that: The connecting assembly (3) comprises a connecting disk (301), a connecting rod (302) and a rotating assembly (303); the connecting disk (301) is fixedly sleeved on the outside above the throat of the printer (1); connecting rods (302) are rotatably connected to the two sides of the connecting disk (301), and the other end of the connecting rod (302) is fixedly connected to the fixed cylinder (201); the rotation of the connecting rod (302) is driven and controlled by the rotating assembly (303); the rotating assembly (303) comprises a motor part (3031) and a gear transmission part (3032); the motor part (3031) is used to drive the gear transmission part (3032); and the gear transmission part (3032) is used to make the output shaft of the motor part (3031) and the connecting rod (302) be transmission-connected.

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