A nozzle for a 3D printer that can move in a fan shape

Abstract

The present invention belongs to the technical field of 3D printing nozzles, and discloses a nozzle for a 3D printer that can move in a fan shape, including a connecting plate and a fixing plate for installing a nozzle assembly at the front end. A heat conduction tube is connected to the lower end of the fixing plate, and a throat tube penetrates through the inside of the heat conduction tube. A heating block is connected to the lower end of the throat tube, and a nozzle body is connected to the lower end of the heating block. A chute is opened at the rear side of the fixing plate, and a slider is arranged inside the chute. A rotating shaft is connected to the rear side of the slider, and the rear end of the rotating shaft is connected to the connecting plate. A feeding motor is installed on the left side of the fixing plate, a feeding gear is connected to the right shaft end of the feeding motor, and an auxiliary gear is arranged behind the feeding gear. For the nozzle for a 3D printer that can move in a fan shape, by providing a clogging clearing structure, it can quickly cut off the consumable material above the throat tube when a clogging occurs, avoid continuous feeding, and can convey air into the throat tube, and use the air to extrude the residual consumable material inside out for cleaning, improving the convenience and efficiency of clogging clearing.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing nozzles, and specifically to a nozzle for a 3D printer that can move in a fan shape. Background Technique

[0002] A 3D printer is a rapid manufacturing device that manufactures three-dimensional objects by stacking materials layer by layer. It is widely used in fields such as product design, prototype production, and parts manufacturing, and has the advantages of high efficiency, flexibility, and precision. The nozzle of a 3D printer, as one of the core components of a 3D printer, largely determines the quality of the formed object; the smoothness of the filament flowing out of the nozzle and the temperature of the filament extrusion directly affect the accuracy of 3D printing.

[0003] However, when the existing nozzles for 3D printers that can move in a fan shape are in use, there are still certain problems:

[0004] There is a nozzle anti-blocking mechanism for a 3D printer, such as the one with the Chinese patent application number CN202022315477.2, which includes a housing. A joint is fixedly installed on the upper end surface of the housing, an installation bracket is fixedly installed on the outside of the housing, a radiator is fixedly installed on the left side of the installation bracket, screw holes are opened on the radiator, a driving motor is fixedly installed inside the radiator, and a rotating shaft is fixedly installed on the output shaft of the driving motor; although the existing nozzles for 3D printers have a certain anti-blocking effect, it is difficult to completely avoid the occurrence of blockage. When the existing 3D printing nozzles are blocked, most of them need to be disassembled for treatment, and the difficulty of cleaning the blockage is great and the operation efficiency is low.

[0005] In view of the above problems, an innovative design is carried out on the basis of the original nozzle for a 3D printer that can move in a fan shape. Summary of the Invention

[0006] The purpose of the present invention is to provide a nozzle for a 3D printer that can move in a fan shape, so as to solve the problem that it is difficult to completely avoid blockage when the existing nozzles for 3D printers are in use, but the existing nozzles need to be disassembled for treatment when blocked, and the difficulty of cleaning the blockage is great and the operation efficiency is low as mentioned in the above background technique.

[0007] To achieve the above purpose, the present invention provides the following technical solution: A nozzle for a 3D printer that can move in a fan shape, including a connecting plate and a fixing plate for installing a nozzle assembly at the front end. The lower end of the fixing plate is connected to a heat conduction pipe, a throat pipe runs through the inside of the heat conduction pipe, the lower end of the throat pipe is connected to a heating block, and the lower end of the heating block is connected to a nozzle body:

[0008] A sliding groove is opened at the rear side of the fixing plate, and a slider is arranged inside the sliding groove. The rear side of the slider is connected to a rotating shaft, and the rear end of the rotating shaft is connected to the connecting plate;

[0009] A feeding motor is installed on the left side of the fixing plate, and a feeding gear is connected to the right shaft end of the feeding motor, and an auxiliary gear is arranged at the rear side of the feeding gear;

[0010] The left side of the fixed plate is rotatably connected to the transmission rod, the upper end of the transmission rod is fixed to the transmission plate, and the guide tube is fixed to the right side of the transmission plate, and the lower end of the guide tube is connected to the cutting knife, the air guide tube is fixed to the rear side of the transmission plate, the upper end of the air guide tube is connected to the corrugated duct, and the piston assembly is fixed to the left side of the fixed plate.

[0011] Preferably, the throat is slidably connected to the thermal conduction tube, and the throat diameter is matched with the inner wall size of the thermal conduction tube, the right side of the thermal conduction tube is snap-connected to the radiator, and a cooling fan is fittedly installed on the right side of the radiator, and the radiator is bolted to the cooling fan.

[0012] By adopting the above technical solution, the temperature conducting tube and the throat can be adapted and installed, and they can be installed close to each other, ensuring that the heat can be smoothly and reliably transferred to the temperature conducting tube and the radiator. The cooperation of the radiator and the cooling fan can achieve rapid heat dissipation, avoid the increase of throat temperature causing the internal consumables to melt, and reduce the clogging of the nozzle body.

[0013] Preferably, the right shaft end of the feeding motor passes through the fixed plate, the upper end of the right side of the fixed plate is rotatably connected to the limit plate, and the lower end of the limit plate is rotatably connected to an auxiliary gear, and the auxiliary gear is meshingly connected with the feeding gear, the rear side of the limit plate is connected to a return spring, and the rear side of the return spring is fixed to the fixed plate.

[0014] By adopting the above technical solution, the feeding motor can drive the feeding gear to rotate. When loading the consumables, the reset spring is used to push the limit plate and the auxiliary gear connected to the lower end to rotate, so that the auxiliary gear and the feeding gear cooperate to clamp the consumables. When the feeding gear rotates, the consumables can be fed and transported.

[0015] Preferably, a lever is fixed to the upper end of the limit plate, and the lever is designed in an "L" shape. A through hole is opened in the middle of the lever, and the printing consumables pass through the through hole.

[0016] By adopting the above technical solution, the through hole in the middle of the lever is used to facilitate the passage of consumables, thereby avoiding affecting the feeding and conveying of the consumables. When the lever is pushed, the limit plate and the auxiliary gear can be driven to rotate synchronously, thereby adjusting the distance between the auxiliary gear and the feeding gear, thereby facilitating the reinstallation of the consumables.

[0017] Preferably, guide wheels are provided on the upper and lower sides of the feeding gear, and the guide wheels are rotatably connected to the fixed plate, the guide wheels are symmetrically distributed front and back, and a protective cover is provided on the right side cover of the guide wheel, and the protective cover is bolted to the fixed plate.

[0018] With the above technical solution, through the design of two sets of guide wheels, the conveyance of the consumable can be guided, ensuring the guiding and positioning of both ends of the consumable, improving the stability of the feeding and conveyance of the consumable, and with the design of the protective cover, the guiding structure and the feeding structure can be protected.

[0019] Preferably, the slider is slidably connected to the chute, and the slider is bolted to the rotating shaft. The rear end of the rotating shaft is rotatably connected to the connecting plate, and a driven gear is fixed to the rear end of the rotating shaft. An adjustment motor is fixed to the rear side of the connecting plate, and the front shaft end of the adjustment motor penetrates through the connecting plate. The front shaft end of the adjustment motor is connected with a driving gear, and the driving gear is meshed with the driven gear.

[0020] With the above technical solution, the driving gear can be driven to rotate by the adjustment motor. The driving gear and the driven gear cooperate to drive the rotating shaft and the fixing plate to rotate. When the fixing plate rotates, the angle of the nozzle body can be adjusted, improving the flexibility of the printing path of the nozzle body and adapting to the printing requirements of more complex structures.

[0021] Preferably, a first electric push rod is arranged at the upper end inside the chute, and the first electric push rod is fixed to the upper inner wall of the chute, and the lower end of the first electric push rod is fixed to the slider.

[0022] With the above technical solution, the slider can be driven to move inside the chute by the first electric push rod, thereby changing the position of the axis of rotation when the fixing plate rotates and changing the rotation range of the nozzle body.

[0023] Preferably, a power motor is fixed to the left side of the fixing plate, and the upper shaft end of the power motor is connected to a transmission rod. The guide tube is designed in a semi-circular tubular shape. The upper end of the throat tube is connected to a conduit, and the lower end of the cutting knife is flush with the upper end of the conduit.

[0024] With the above technical solution, the transmission rod can be driven to rotate by the power motor. The transmission rod drives the transmission plate, the guide tube and the cutting knife to rotate. When the cutting knife moves above the conduit, the cutting knife can be used to cut the consumable inside the conduit, realizing the truncation of the consumable and facilitating the rapid treatment when the consumable is blocked.

[0025] Preferably, the bottom of the air guide tube is flush with the upper end of the conduit, and the air guide tube is in communication when it coincides with the conduit. A second electric push rod is arranged at the lower end of the piston assembly, and the second electric push rod is fixed to the fixing plate. An air inlet and outlet one-way valve is installed at the upper end of the piston assembly, and the upper end of the air outlet one-way valve is in communication with the corrugated conduit. A piston is arranged inside the piston assembly, and the upper end of the second electric push rod penetrates into the piston assembly and is connected to the piston.

[0026] With the above technical solution, through the cooperation of the second electric push rod and the piston assembly, the air supply of the air duct can be realized when the second electric push rod expands and contracts, and the air can be transported to the inside of the duct and the throat pipe by the cooperation of the corrugated duct and the air duct. When the second electric push rod expands and contracts rapidly, high-pressure air can be provided to clean the consumables remaining inside the throat pipe and the nozzle body.

[0027] Compared with the prior art, the beneficial effect of the present invention is that the nozzle for a 3D printer with fan-shaped movement can quickly cut off the consumables at the upper part of the throat pipe when a blockage occurs through the provision of a blockage clearing structure, avoiding continuous feeding, and can transport air into the throat pipe, and use the air to squeeze out the remaining consumables inside to achieve cleaning, improving the convenience and efficiency of blockage clearing.

[0028] 1. By providing an angle adjustment structure, the angle between the connecting plate and the fixing plate can be adjusted, and thus the angle of the nozzle body can be adjusted in a fan shape. When printing different layers or different regions, the fan-shaped movement angle and swing speed can be adjusted as needed to adapt to different printing requirements. When printing a large-area plane, the fan-shaped movement angle can be increased to reduce the number of back-and-forth movements of the nozzle body and improve the printing efficiency; when printing a complex curved surface, by precisely controlling the angle and trajectory of the fan-shaped swing, the material can be made to fit the curved surface shape better, improving the printing accuracy.

[0029] 2. By providing a precise feeding structure, the uniform feeding of the consumables can be maintained, the feeding accuracy of the consumables can be improved, and it is ensured that the nozzle body can extrude the consumables uniformly at a constant speed, realizing the printing of workpieces, and further improving the printing quality and printing accuracy of the workpieces. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 It is a schematic diagram of the left-side structure of the present invention;

[0032] Figure 3 It is a schematic diagram of the heating block and the nozzle body structure of the present invention;

[0033] Figure 4 It is a schematic diagram of the disassembled structure of the radiator and the cooling fan of the present invention;

[0034] Figure 5 It is a schematic diagram of the slider and the rotating shaft structure of the present invention;

[0035] Figure 6 It is a schematic diagram of the rotating shaft and the driven gear structure of the present invention;

[0036] Figure 7 It is a schematic diagram of the slider and the sliding groove structure of the present invention;

[0037] Figure 8 Schematic diagram of the drive plate and drive rod structure of the present invention;

[0038] Figure 9 Schematic diagram of the piston assembly and the second electric push rod structure of the present invention.

[0039] In the figure: 1, connecting plate; 2, fixing plate; 3, heat conduction tube; 4, throat tube; 5, heating block; 6, nozzle body; 7, radiator; 8, cooling fan; 9, feeding motor; 10, feeding gear; 11, limiting plate; 12, auxiliary gear; 13, return spring; 14, lever; 15, guide wheel; 16, protective cover; 17, adjusting motor; 18, driving gear; 19, rotating shaft; 20, slider; 21, driven gear; 22, chute; 23, first electric push rod; 24, drive rod; 25, drive plate; 26, guide tube; 27, cutting knife; 28, air duct; 29, corrugated duct; 30, piston assembly; 31, second electric push rod; 32, power motor. Specific embodiments

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

[0041] Please refer to Figures 1-9 , the present invention provides a technical solution: a nozzle for a 3D printer that can move in a fan shape, including a connecting plate 1 and a fixing plate 2 for installing a nozzle assembly at the front end. The lower end of the fixing plate 2 is connected to a heat conduction tube 3. The heat conduction tube 3 penetrates through a throat tube 4 inside, and the lower end of the throat tube 4 is connected to a heating block 5. The lower end of the heating block 5 is connected to a nozzle body 6. During use, the nozzle structure can be installed inside the 3D printer by using the connecting plate 1 and connected to a trolley to ensure the horizontal and stable connection between the connecting plate 1 and the sliding table. The printing consumables are led out and inserted into the throat tube 4, and the feeding structure is used to push the consumables into the throat tube 4. Before the printer operates, the heating block 5 is controlled by the control system to increase the temperature. A temperature detection element is also provided inside the heating block 5 to monitor the temperature in real time and feedback the data to the control system of the printer. The control system adjusts the heating power of the heating block 5 according to the feedback information to maintain a stable printing temperature. When the heating block 5 is heated to a preset temperature, the consumables continue to be fed and softened, and when the consumables continue to be fed, the consumables can be extruded from the lower end of the nozzle body 6 to achieve printing.

[0042] The throat 4 is slidably connected to the temperature conducting tube 3, and the diameter of the throat 4 is matched with the inner wall size of the temperature conducting tube 3. The right side of the temperature conducting tube 3 is snap-fitted to the radiator 7, and a cooling fan 8 is fitted on the right side of the radiator 7, and the radiator 7 is bolted to the cooling fan 8. When in use, the temperature conducting tube 3 and the throat 4 fit tightly after installation to maintain temperature transfer, avoid heat from the heating block 5 to the throat 4 during 3D printing, avoid heating of the throat 4 in advance of the hose consumables, reduce the probability of blockage of the nozzle structure, and the temperature conducting tube 3 can transmit the temperature of the throat 4 to the radiator 7 to improve the heat dissipation efficiency. At the same time, the cooling fan 8 will adjust the speed according to the temperature conditions to ensure that the radiator 7 can effectively dissipate heat and avoid excessive temperature in the throat 4.

[0043] A feeding motor 9 is installed on the left side of the fixed plate 2, and the right shaft end of the feeding motor 9 is connected to a feeding gear 10, and an auxiliary gear 12 is arranged on the rear side of the feeding gear 10; the right shaft end of the feeding motor 9 passes through the fixed plate 2, and the upper end of the right side of the fixed plate 2 is rotatably connected to the limit plate 11, and the lower end of the limit plate 11 is rotatably connected to the auxiliary gear 12, and the auxiliary gear 12 is meshed and connected with the feeding gear 10, and a return spring 13 is connected to the rear side of the limit plate 11, and the rear side of the return spring 13 is fixed to the fixed plate 2; a lever 14 is fixed to the upper end of the limit plate 11, and the lever 14 is designed in an "L" shape, and a through hole is opened in the middle of the lever 14, and the printing consumables pass through the inside of the through hole; guide wheels 15 are arranged on the upper and lower sides of the feeding gear 10, and the guide wheels 15 are rotatably connected to the fixed plate 2, and the guide wheels 15 are symmetrically distributed front and back, and a protective cover 16 is provided on the right side cover of the guide wheel 15, and the protective cover 16 is bolted to the fixed plate 2. In order to ensure the stable conveying of consumables during printing, a feeding structure is provided to lead the printing consumables from the consumable reel, pass through the through hole in the middle of the lever 14, between the feeding gear 10 and the auxiliary gear 12, and between the guide wheels 15, and finally feed them into the throat 4. During the insertion process, the lever 14 can be driven to drive the limit plate 11 and the auxiliary gear 12 to rotate, control the distance between the auxiliary gear 12 and the feeding gear 10, ensure that the consumables can pass through, and after the lever 14 is released, the reset spring 13 can push the limit plate 11 to reset, so that the auxiliary gear 12 and the feeding gear 10 clamp the consumables. During printing, the feeding motor 9 is started, and the feeding motor 9 drives the feeding gear 10 to rotate. Since the auxiliary gear 12 is meshed with the feeding gear 10, and the two clamp the consumables, the rotation of the feeding gear 10 will drive the consumables to move toward the throat 4; the two sets of guide wheels 15 guide and limit the consumables, ensuring that the consumables can accurately enter the throat 4, improving the stability of consumable transportation, and the protective cover 16 can prevent debris from entering the feeding area and protect the normal operation of the feeding structure. The feeding motor 9 is a servo motor that can accurately control the rotation speed, maintain a uniform feeding speed, and can control the feeding speed according to printing requirements.

[0044] A chute 22 is provided at the rear side of the fixed plate 2, and a slider 20 is arranged inside the chute 22. A rotating shaft 19 is connected to the rear side of the slider 20, and the rear end of the rotating shaft 19 is connected to the connecting plate 1. The slider 20 is slidably connected to the chute 22, and the slider 20 is bolted to the rotating shaft 19. The rear end of the rotating shaft 19 is rotatably connected to the connecting plate 1, and a driven gear 21 is fixed to the rear end of the rotating shaft 19. An adjusting motor 17 is fixed to the rear side of the connecting plate 1, and the front shaft end of the adjusting motor 17 penetrates through the connecting plate 1. A driving gear 18 is connected to the front shaft end of the adjusting motor 17, and the driving gear 18 is meshed with the driven gear 21. A first electric push rod 23 is arranged at the upper end inside the chute 22, and the first electric push rod 23 is fixed to the upper inner wall of the chute 22, and the lower end of the first electric push rod 23 is fixed to the slider 20. During the printing process, the control system starts the adjusting motor 17, and the adjusting motor 17 drives the driving gear 18 to rotate. Since the driving gear 18 is meshed with the driven gear 21, the driven gear 21 drives the rotating shaft 19 to rotate, so that the fixed plate 2 and the nozzle assembly rotate around the rotating shaft 19, realizing the sector adjustment of the angle of the nozzle body 6. The adjusting motor 17 is a high-precision servo motor, which can accurately control the rotation angle of the nozzle body 6 and improve the printing accuracy. When printing different layers or different regions, the angle and swing speed of the sector movement can be adjusted as needed to adapt to different printing requirements, and the distance between the nozzle body 6 and the center of the rotation axis of the fixed plate 2 can be adjusted according to the size of the workpiece. The first electric push rod 23 is used to push the slider 20 to move inside the chute 22, controlling the rotation range of the nozzle body 6 at the same rotation angle. When printing a large-area plane, the sector movement angle can be increased, reducing the number of round trips of the nozzle body 6 and improving the printing efficiency; when printing a complex curved surface, by accurately controlling the angle and trajectory of the sector swing, the material can be more closely fitted to the curved surface shape, improving the printing accuracy.

[0045] The left side of the fixed plate 2 is rotatably connected to the transmission rod 24. The upper end of the transmission rod 24 is fixed with a transmission plate 25. The right side of the transmission plate 25 is fixed with a guide tube 26. The lower end of the guide tube 26 is connected to a cutting knife 27. The rear side of the transmission plate 25 is fixed with an air guide tube 28. The upper end of the air guide tube 28 is connected to a corrugated duct 29. The left side of the fixed plate 2 is fixed with a piston assembly 30. A power motor 32 is fixed on the left side of the fixed plate 2, and the shaft end of the power motor 32 is connected to the transmission rod 24. The guide tube 26 is designed as a semi-circular tube. The upper end of the throat tube 4 is connected with a duct. The lower end of the cutting knife 27 is flush with the upper end of the duct. The bottom of the air guide tube 28 is flush with the upper end of the duct, and the air guide tube 28 is in communication when it coincides with the duct. A second electric push rod 31 is arranged at the lower end of the piston assembly 30, and the second electric push rod 31 is fixed to the fixed plate 2. An air inlet and outlet check valve is installed at the upper end of the piston assembly 30, and the upper end of the air outlet check valve is in communication with the corrugated duct 29. A piston is arranged inside the piston assembly 30, and the upper end of the second electric push rod 31 penetrates into the piston assembly 30 to be connected with the piston. When the nozzle body 6 is blocked, or it is necessary to stop feeding or replace the consumables, the power motor 32 is started to drive the transmission rod 24 to rotate. The transmission rod 24 drives the transmission plate 25 to rotate, so that the cutting knife 27 below the guide tube 26 rotates to the position of the duct at the upper end of the throat tube 4 to cut the consumables. After cutting, the cleaning of the nozzle body 6 and the throat tube 4 can be realized. The power motor 32 continues to drive the transmission plate 25 to rotate, and makes the air guide tube 28 move above the duct and coincide. Since the air inlet and outlet check valve is installed at the upper end of the piston assembly 30, the piston assembly 30 is a sealed tube with an opening at the lower end, and a piston is arranged inside. When the second electric push rod 31 pushes the piston inside the piston assembly 30 to move downward, external air enters the piston assembly 30 through the air inlet check valve, and when the piston moves upward again, it pushes the internal air to be transported to the corrugated duct 29 through the air outlet check valve. The air enters the air guide tube 28 through the corrugated duct 29 to blow and clean the inside of the throat tube 4, prevent the remaining consumables from blocking the throat tube 4, and stop feeding by system control when cleaning the throat tube 4. After the cleaning of the throat tube 4 is completed, the power motor 32 is started to rotate in the reverse direction again to drive the guide tube 26 and the cutting knife 27 to reset. Since the guide tube 26 is designed as a semi-circular tube, after cutting the consumables, it can drive the consumables to deflect to the side of the duct. After the guide tube 26 is reset, the flexible consumables can be reset to the upper end of the duct. The upper end of the duct is designed as a funnel shape, so that the consumables can smoothly enter the throat tube 4 during feeding in the next printing use, without manual adjustment again, improving the operation convenience.

[0046] Embodiment 2. The difference between this embodiment and Embodiment 1 lies in the different ways of supplying cleaning air to the throat tube 4. In Embodiment 2, a compressed air tank is used for air supply and is controlled in cooperation with an electromagnetic valve. When the catheter coincides with the air duct 28, the electromagnetic valve controls conduction, and high-pressure air can continuously flow into the throat tube 4 to achieve the cleaning of consumables. The cleaning effect is good and the efficiency is higher. However, the cost of this embodiment is relatively high, and the compressed air tank needs to be replaced after the use of compressed air. The structure of Embodiment 1 is relatively simple and the cost is lower.

[0047] The content not detailedly described in this specification belongs to the prior art well-known to those skilled in the art. Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A nozzle for a 3D printer that can move in a fan shape, comprising a connecting plate (1) and a fixing plate (2) for installing a nozzle assembly at the front end. The lower end of the fixing plate (2) is connected to a temperature guiding pipe (3). A throat pipe (4) penetrates through the interior of the temperature guiding pipe (3). The lower end of the throat pipe (4) is connected to a heating block (5), and the lower end of the heating block (5) is connected to a nozzle body (6). It is characterized in that: A sliding groove (22) is formed at the rear side of the fixing plate (2), and a slider (20) is arranged inside the sliding groove (22). The rear side of the slider (20) is connected to a rotating shaft (19), and the rear end of the rotating shaft (19) is connected to the connecting plate (1); A feeding motor (9) is installed on the left side of the fixing plate (2), and a feeding gear (10) is connected to the right shaft end of the feeding motor (9). An auxiliary gear (12) is arranged behind the feeding gear (10); The fixing plate (2) is rotatably connected to a transmission rod (24) on the left side. The upper end of the transmission rod (24) is fixed with a transmission plate (25). A guiding pipe (26) is fixed on the right side of the transmission plate (25). The lower end of the guiding pipe (26) is connected to a cutting knife (27). A gas guiding pipe (28) is fixed on the rear side of the transmission plate (25). The upper end of the gas guiding pipe (28) is connected to a corrugated guiding pipe (29). A piston assembly (30) is fixed on the left side of the fixing plate (2); The right shaft end of the feeding motor (9) penetrates through the fixing plate (2). The upper end of the right side of the fixing plate (2) is rotatably connected to a limiting plate (11). The lower end of the limiting plate (11) is rotatably connected to an auxiliary gear (12), and the auxiliary gear (12) is meshed and connected with the feeding gear (10). A return spring (13) is connected to the rear side of the limiting plate (11), and the rear side of the return spring (13) is fixed to the fixing plate (2); The slider (20) is slidably connected to the sliding groove (22), and the slider (20) is bolted to the rotating shaft (19). The rear end of the rotating shaft (19) is rotatably connected to the connecting plate (1), and a driven gear (21) is fixed to the rear end of the rotating shaft (19). An adjusting motor (17) is fixed on the rear side of the connecting plate (1). The front shaft end of the adjusting motor (17) penetrates through the connecting plate (1). The front shaft end of the adjusting motor (17) is connected to a driving gear (18), and the driving gear (18) is meshed and connected with the driven gear (21); A first electric push rod (23) is arranged at the upper end inside the sliding groove (22). The first electric push rod (23) is fixed to the upper inner wall of the sliding groove (22), and the lower end of the first electric push rod (23) is fixed to the slider (20).

2. The nozzle for a 3D printer capable of fan-shaped movement according to claim 1, wherein: The throat pipe (4) is slidably connected to the temperature guiding pipe (3), and the diameter of the throat pipe (4) is adapted to the inner wall size of the temperature guiding pipe (3). A radiator (7) is snap - connected to the right side of the temperature guiding pipe (3). A cooling fan (8) is attached to the right side of the radiator (7), and the radiator (7) is bolted to the cooling fan (8).

3. The nozzle for a 3D printer capable of fan-shaped movement according to claim 1, characterized in that: A dial rod (14) is fixed to the upper end of the limiting plate (11). The dial rod (14) is designed in an "L" shape. A through - hole is formed in the middle of the dial rod (14), and the printing consumables penetrate through the inside of the through - hole.

4. The nozzle for a 3D printer capable of fan-shaped movement according to claim 2, wherein: Guide wheels (15) are provided on the upper and lower sides of the feeding gear (10), and the guide wheels (15) are rotatably connected to the fixing plate (2). The guide wheels (15) are symmetrically distributed front and back. A protective cover (16) is provided on the right side cover of the guide wheel (15), and the protective cover (16) is bolted to the fixing plate (2).

5. The nozzle for a 3D printer capable of fan-shaped movement according to claim 1, wherein: A power motor (32) is fixed on the left side of the fixing plate (2), and the upper shaft end of the power motor (32) is connected to the transmission rod (24). The guide tube (26) is designed in a semicircular tube shape. The upper end of the throat tube (4) is connected to a conduit, and the lower end of the cutting knife (27) is flush with the upper end of the conduit.

6. The nozzle for a 3D printer capable of sector movement according to claim 5, characterized in that: The bottom of the air guide tube (28) is flush with the upper end of the conduit, and the air guide tube (28) and the conduit are connected when they overlap; a second electric push rod (31) is provided at the lower end of the piston assembly (30), and the second electric push rod (31) is fixed to the fixing plate (2); an inlet and outlet check valve is installed at the upper end of the piston assembly (30), and the upper end of the outlet check valve is connected to the corrugated conduit (29); a piston is provided inside the piston assembly (30), and the upper end of the second electric push rod (31) penetrates into the piston assembly (30) and is connected to the piston.

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