Variable-caliber 3D printer nozzle

Abstract

The utility model discloses a variable-caliber 3D printer nozzle which comprises a nozzle support, a feeding device, a small nozzle device, a large nozzle device and a displacement device are sequentially arranged on the nozzle support at intervals, one end of the small nozzle device is connected with the feeding device, and the other end of the small nozzle device is connected with the large nozzle device. The displacement device is used for adjusting the working states of the small nozzle device and the large nozzle device; wherein in the working state of the large nozzle device, consumables flow into the large nozzle device through the small nozzle device; and in the working state of the small nozzle device, the large nozzle device is blocked by the small nozzle device, and the consumables flow out of the small nozzle device. According to the nozzle, in the printing process of a large workpiece, the small nozzle device and the large nozzle device can be switched through the displacement device, and the flexibility and adaptability of a printer are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of 3D printer nozzles, and particularly relates to a 3D printer nozzle with a variable aperture. Background Technique

[0002] With the continuous progress of China's economic construction, the rapid development of 3D printing technology has followed. The nozzle is a very important component of a 3D printer. The printing material is melted at high temperature and then ejected through the nozzle to form a three-dimensional product. For 3D printing nozzles, domestic scientific research workers have put forward many innovative solutions from different angles:

[0003] Publication No. CN117428889A proposes a method for preventing deposits at the nozzle plate of a 3D printer and a 3D printer. By increasing the saturation level of the carrier liquid of the printing liquid in the air in front of the nozzle plate, it is possible to prevent external dust and impurities from entering the nozzle when the nozzle is not in use and causing blockage, so that subsequent nozzle printing can be carried out normally.

[0004] Publication No. CN116330655A proposes an innovative structure of a 3D printer nozzle and a 3D printer. Through the cooperation of a gear and a toothed ring structure, the difficulty for workers to replace the nozzle is reduced.

[0005] Publication No. CN219564145U proposes a 3D printer nozzle with stable heating and heat dissipation. Through the spiral heating wire arranged in the heating inner tube, uniform heating of the nozzle is achieved, effectively preventing the situation of the consumable material blocking the nozzle caused by uneven heating. Through the spiral heat dissipation fins and the water-cooled heat dissipation tube arranged on the throat tube, stable heat dissipation of the throat tube is carried out.

[0006] Publication No. CN218535651U proposes a 3D printer quick-disassembly nozzle head. Through the cooperation of a sealing ring, a gasket ring, a circlip and a ferrule structure, the problem that the threaded installation method of the 3D printer nozzle affects the installation effect after multiple disassembly and assembly is effectively solved.

[0007] Publication No. CN218429996U proposes a 3D printer nozzle device. Through the cooperation of a gear, a toothed plate, a slider and a pull rod structure, external dust and impurities are prevented from entering the nozzle when the nozzle is not in use and causing blockage, so that subsequent nozzle printing can be carried out normally.

[0008] Publication No. CN217414917U proposes a 3D printer nozzle structure, which realizes a spiral fine groove printing path, thereby expanding the contact area of the consumable material between the upper and lower layers, improving the interlayer bonding force, enhancing the forming strength of the workpiece in the Z-axis direction, and having a simple structure.

[0009] Current FDM 3D printer nozzles are all fixed-diameter nozzles. The nozzles of small 3D printers are generally 0.3 - 0.5 mm, with a typical diameter of 0.4 mm. The nozzle diameters of large 3D printers are generally 0.8 - 2 mm, or even larger.

[0010] The advantage of a small nozzle is that the width of the printed line is smaller, and it can print thin-walled parts with a smaller wall thickness. However, when printing features with a large wall thickness on a large printing area, the line width of the small nozzle is small, the printing speed is slow, and the printing efficiency is low. The typical speed is 10 ml / h.

[0011] For large 3D printers, a larger printing area and printing speed are required, which requires the diameter of the printing nozzle to be increased. In this way, more printing material can be printed per unit time, and the printing efficiency is higher. The typical speed is 100 ml / h or even higher. However, large workpieces often have many detailed features. Since large-diameter nozzles cannot achieve a narrow extrusion width, the detailed features on large workpieces can only be printed separately with small-nozzle equipment and then bonded. This not only increases the post-processing procedures and production costs, but also the dimensional accuracy and strength of the bonding are not easy to guarantee, resulting in subsequent risks such as installation position errors and detachment. Summary of the Utility Model

[0012] The utility model provides a 3D printer nozzle with a variable diameter, which is used to solve the technical defect that the prior art cannot achieve the variable-diameter printing function during the printing process of large printing workpieces.

[0013] To achieve the above object, the utility model adopts the following technical solutions:

[0014] A 3D printer nozzle with a variable diameter includes a nozzle bracket. The nozzle bracket is sequentially and spacedly provided with a feeding device, a small nozzle device, a large nozzle device, and a displacement device. One end of the small nozzle device is connected to the feeding device, and the other end is connected to the large nozzle device. The displacement device is used to adjust the working states of the small nozzle device and the large nozzle device.

[0015] Among them, in the working state of the large nozzle device, the consumable flows into the large nozzle device through the small nozzle device; in the working state of the small nozzle device, the large nozzle device is blocked by the small nozzle device, and the consumable flows out from the small nozzle device.

[0016] Further, the nozzle bracket includes a bracket main body. The bracket main body is provided with a feeding machine installation surface, an upper limit, a lower limit, and a limit switch installation platform. The upper limit and the lower limit are arranged in the middle of the bracket main body, and the feeding machine installation surface and the limit switch installation platform are arranged at opposite ends of the bracket main body.

[0017] The feeding device includes a feeder, which has a feeder main body. The feeder main body is arranged on the feeder mounting surface. A feeder gear is provided on the feeder main body, and the feeder gear is connected to a feeder motor, which is arranged on the other side of the bracket main body.

[0018] Further, the small nozzle device includes a slider and a first displacement roller. The first slider is slidably connected to the nozzle bracket and is located below the feeding device. A small nozzle bracket is provided on the first slider;

[0019] The bottom of the small nozzle bracket is connected to a small nozzle main body, a spring and a first displacement roller. The first displacement roller is arranged on the small nozzle bracket and is tangent to the displacement device.

[0020] Further, the small nozzle main body includes a consumable channel and an overflow hole, and the consumable channel is communicated with the overflow hole.

[0021] Further, the large nozzle device includes a large nozzle main body. A second slider is provided on the large nozzle main body. The second slider is slidably connected to the nozzle bracket. A large nozzle bracket, a heating rod and a second displacement roller are provided on the large nozzle main body;

[0022] A heating rod mounting hole and an overflow cavity are formed in the large nozzle main body. The heating rod is inserted and removed and installed in the heating rod mounting hole, and the overflow cavity is communicated with the small nozzle device.

[0023] Further, the displacement device includes a displacement main body, which is arranged on the nozzle bracket and is located on one side of the small nozzle device. A displacement motor, an eccentric wheel, a displacement bracket and a limit switch are provided on the displacement main body; the displacement motor is arranged on the other side of the nozzle bracket, and the driving end of the displacement motor is connected to the eccentric wheel;

[0024] The limit switch is arranged on the nozzle bracket, and the displacement bracket is connected to the limit switch.

[0025] Further, a motor mounting hole and an eccentric groove are provided in the eccentric wheel. The eccentric groove is located outside the motor mounting hole, and the driving end of the displacement motor is connected to the eccentric wheel through the motor mounting hole.

[0026] Further, the displacement bracket includes a guide post, and an inclined surface and a limit boss are connected to the guide post.

[0027] Further, the cross section of the limit boss is concave.

[0028] Further, the cross section of the inclined surface is U-shaped.

[0029] Compared with the prior art, the utility model has the following beneficial effects:

[0030] 1. The nozzle enables the switching between the small nozzle device and the large nozzle device during the printing of large workpieces through the displacement device, improving the flexibility and adaptability of the printer. When using the large nozzle device for large-area printing, the flow rate of the liquid consumable is large, but since the printing speed is correspondingly increased, the consumption of the consumable per unit area does not necessarily increase. When high-precision printing is required, the small nozzle device can effectively control the flow rate of the consumable, reducing unnecessary waste, thus saving the consumable cost and solving the technical defect that the prior art cannot achieve the variable-aperture printing function during the printing of large workpieces.

[0031] 2. Through the settings of the upper limit position and the lower limit position, the position of the feeding device during operation can be ensured to be accurate, which helps to improve the printing accuracy and stability, and can also effectively prevent damage caused by exceeding the working range. The feeding machine gear is driven by a motor to control the feeding speed and flow rate of the liquid consumable, improving the automation level of the equipment, reducing the need for manual intervention, and ensuring the stability and reliability of the printing process at the same time.

[0032] 3. The displacement roller is tangentially matched with the displacement device, making the displacement process of the small nozzle device more accurate and reliable. By adjusting the position or movement of the displacement device, the sliding distance and position of the small nozzle device can be accurately controlled, thereby achieving precise adjustment of the nozzle aperture.

[0033] 4. Since the consumable channel and the overflow hole are connected, even if there is a slight blockage in the consumable channel, the liquid consumable can still flow through the overflow hole, thus ensuring the continuity of printing. Description of the Drawings

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0035] Figure 1 Schematic structural diagram of the variable-aperture 3D printer nozzle provided by the present invention;

[0036] Figure 2 Schematic working principle diagram of the variable-aperture 3D printer nozzle provided by the present invention;

[0037] Figure 3 Enlarged view of the nozzle in the large-nozzle working mode of the variable-aperture 3D printer nozzle provided by the present invention;

[0038] Figure 4 Schematic diagram of the working mode of the small nozzle in the variable-diameter 3D printer nozzle provided by the present utility model;

[0039] Figure 5 Enlarged view of the nozzle in the working mode of the small nozzle in the variable-diameter 3D printer nozzle provided by the present utility model;

[0040] Figure 6 Schematic diagram of the nozzle support structure in the variable-diameter 3D printer nozzle provided by the present utility model;

[0041] Figure 7 Schematic diagram of the eccentric wheel structure in the variable-diameter 3D printer nozzle provided by the present utility model;

[0042] Figure 8 Schematic diagram of the displacement support structure in the variable-diameter 3D printer nozzle provided by the present utility model;

[0043] Figure 9 Schematic diagram of the main structure of the small nozzle in the variable-diameter 3D printer nozzle provided by the present utility model;

[0044] Figure 10 Schematic diagram of the main structure of the large nozzle in the variable-diameter 3D printer nozzle provided by the present utility model;

[0045] Figure 11 Structural diagram of the printed workpiece.

[0046] Wherein: consumable 1, feeding device 2, feeding motor 2-1, main body of the feeding machine 2-2, feeding machine gear 2-3, small nozzle device 3, first slider 3-1, small nozzle support 3-2, small nozzle main body 3-3, consumable channel 3-3-1, overflow hole 3-3-2, spring 3-4, first displacement roller 3-5, large nozzle device 4, second slider 4-1, large nozzle support 4-2, large nozzle main body 4-3, heating rod installation hole 4-3-1, overflow chamber 4-3-2, heating rod 4-4, second displacement roller 4-5, displacement device 5, displacement motor 5-1, eccentric wheel 5-2, motor installation hole 5-2-1, eccentric groove 5-2-2, displacement support 5-3, guide post 5-3-1, inclined surface 5-3-2, limit boss 5-3-3, limit switch 5-4, third slider 5-5, nozzle support 6, installation surface 6-1, upper limit 6-2, lower limit 6-3, limit switch installation platform 6-4, printing platform 7, workpiece 8. Specific embodiments

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. The components of the embodiments of the present utility model described and illustrated herein can be arranged and designed in various different configurations.

[0048] Therefore, the detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0049] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not require further definition and explanation in subsequent drawings.

[0050] In the description of the embodiments of the present utility model, it should be noted that if terms such as "upper", "lower", "horizontal", "inner", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use, it is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, terms such as "first", "second", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0051] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0052] In the description of the embodiments of the present utility model, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "connected" are understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0053] The following further describes the present utility model in detail with reference to the accompanying drawings:

[0054] such as Figures 1-10As shown in the figure, a variable-orifice 3D printer nozzle includes a nozzle bracket 6. An inlet device 2, a small nozzle device 3, a large nozzle device 4, and a displacement device 5 are sequentially arranged on the nozzle bracket 6 at intervals. One end of the small nozzle device 3 is connected to the inlet device 2, and the other end is connected to the large nozzle device 4. The displacement device 5 is used to adjust the working states of the small nozzle device 3 and the large nozzle device 4. Among them, in the working state of the large nozzle device 4, the liquid consumable 1 flows into the large nozzle device 4 through the small nozzle device 3. In the working state of the small nozzle device 3, the large nozzle device 4 is blocked by the small nozzle device 3, and the liquid consumable 1 flows out of the small nozzle device 3. This nozzle enables the switching between the small nozzle device 3 and the large nozzle device 4 during the printing of large workpieces 8 through the displacement device 5, improving the flexibility and adaptability of the printer and solving the technical defect that the prior art cannot achieve the variable-orifice printing function during the printing of large printed workpieces. When using the large nozzle device 4 for large-area printing, the flow rate of the liquid consumable is large, but since the printing speed is correspondingly increased, the usage amount of the consumable 1 per unit area does not necessarily increase. When high-precision printing is required, the small nozzle device 3 can effectively control the flow rate of the consumable 1, reducing unnecessary waste, thereby saving the consumable cost. Specifically, the nozzle bracket 6 includes a bracket main body. An inlet machine mounting surface 6-1, an upper limit 6-2, a lower limit 6-3, and a limit switch mounting platform 6-4 are provided on the bracket main body. The upper limit 6-2 and the lower limit 6-3 are arranged in the middle of the bracket main body, and the inlet machine mounting surface 6-1 and the limit switch mounting platform 6-4 are arranged at opposite ends of the bracket main body. Through the settings of the upper limit 6-2 and the lower limit 6-3, the position of the inlet device 2 during operation can be ensured to be accurate, which helps to improve the printing accuracy and stability and can also effectively prevent damage caused by exceeding the working range. The inlet device 2 includes an inlet machine. The inlet machine has an inlet machine main body 2-2. The inlet machine main body 2-2 is arranged on the inlet machine mounting surface 6-1. An inlet machine gear 2-3 is provided on the inlet machine main body 2-2. The inlet machine gear 203 is connected to an inlet machine motor 2-1. The inlet machine motor 2-1 is arranged on the other side of the bracket main body. The small nozzle device 3 includes a first slider 3-1 and a first displacement roller 3-5. The first slider 3-1 is slidably connected to the nozzle bracket 6 and is located below the inlet device 2. A small nozzle bracket 3-2 is provided on the first slider 3-1. The bottom of the small nozzle bracket 3-2 is connected to a small nozzle main body 3-3, a spring 3-4, and a first displacement roller 3-5. The first displacement roller 3-5 is arranged on the small nozzle bracket 3-2 and is tangent to the displacement device 5. The small nozzle main body 3-3 includes a consumable channel 3-3-1 and an overflow hole 3-3-2. The consumable channel 3-3-1 is communicated with the overflow hole 3-3-2.The large nozzle device 4 includes a large nozzle body 4-3. A second slider 4-1 is provided on the large nozzle body 4-3. The second slider 4-1 is slidably connected to the nozzle support 6. A large nozzle support 4-2, a heating rod 4-4 and a second displacement roller 4-5 are provided on the large nozzle body 4-3. A heating rod mounting hole 4-3-1 and an overflow chamber 4-3-2 are formed in the large nozzle body 4-3. The heating rod 4-4 is inserted and removed and installed in the heating rod mounting hole 4-3-1. The overflow chamber 4-3-2 is communicated with the small nozzle device 3. The displacement device 5 includes a displacement main body. The displacement main body is arranged on the nozzle support 6 and is located on one side of the small nozzle device 3. A displacement motor 5-1, an eccentric wheel 5-2, a displacement support 5-3 and a limit switch 5-4 are provided on the displacement main body. The displacement motor 5-1 is arranged on the other side of the nozzle support 6. The driving end of the displacement motor 5-1 is connected to the eccentric wheel 5-2. The limit switch 5-4 is arranged on the nozzle support 6. The displacement support 5-3 is connected to the limit switch 5-4. An electric motor mounting hole 5-2-1 and an eccentric groove 5-2-2 are provided in the eccentric wheel 5-2. The eccentric groove 5-2-2 is located outside the electric motor mounting hole 5-2-1. The driving end of the displacement motor 5-1 is connected to the eccentric wheel 5-2 through the electric motor mounting hole 5-2-1. The displacement support 5-3 includes a guide post 5-3-1. A slope 5-3-2 and a limit boss 5-3-3 are connected to the guide post 5-3-1. The cross section of the limit boss 5-3-3 is concave. The cross section of the slope 5-3-2 is U-shaped. During the process of the displacement motor 5-1 driving the eccentric wheel 5-2 to rotate, the eccentric wheel 5-2 cooperates with the guide post 5-3-1 so that the slope 5-3-2 drives the first displacement roller 3-5 and the second displacement roller 4-5 to rotate, thereby adjusting the positions of the small nozzle device 3 and the large nozzle device 4. During specific operation, the feeder 2 is installed on the feeder mounting surface 6-1 of the nozzle support 6. The small nozzle module 3 is connected to the nozzle support 6 through the first slider 3-1. The large nozzle module 4 is connected to the nozzle support 6 through the second slider 4-1. The displacement mechanism 5 is connected to the nozzle support 6 through the third slider 5-5. The displacement motor 5-1 is installed on the nozzle support 6. The eccentric wheel 5-2 is installed on the displacement motor 5-1 through the electric motor mounting hole 5-2-1. The small nozzle body 3-3 and the small nozzle support 3-2 are connected by bolts. The large nozzle body 4-3 and the large nozzle support 4-2 are connected by bolts. The heating rod 4-4 is installed in the heating rod mounting hole 4-3-1 of the large nozzle body 4-3. The upper end of the small nozzle body 3-3 is coaxially connected to the feeder main body 2-2. The lower end of the small nozzle body 3-3 is coaxially connected to the large nozzle body 4-3. The displacement support 5-3 and the third slider 5-5 are connected by bolts. The guide post 5-3-1 on the displacement support 5-3 is tangent to the eccentric groove 5-2-2 on the eccentric wheel 5-2. The first displacement roller 3-5 and the second displacement roller 4-5 are tangent to the two slopes 5-3-2 on the displacement support 5-3.The spring 3-4 is installed between the small nozzle bracket 3-2 and the large nozzle bracket 4-2, and two limit switches 5-4 are installed on the limit switch installation platform 6-4 of the nozzle head bracket 6. After the 3D printer starts working, the heating rod 4-4 starts to heat up. After reaching the liquefaction temperature of the consumable 1, the feed gear 2-3 on the feeder 2 starts to rotate, and the consumable 1 is fed into the consumable channel 3-3-1 of the small nozzle body 3-3 of the small nozzle module 3. As shown in... Figure 2 , 3 As shown in the working state of the large nozzle, the displacement bracket 5-3 is on the left side. The spring 3-4 pushes the small nozzle bracket 3-2 upward to the upper mechanical limit 6-2 on the nozzle head bracket 6, and the spring 3-4 pushes the large nozzle bracket 4-2 downward to the lower mechanical limit 6-3 on the nozzle bracket 6. At this time, the consumable 1 melts into a liquid and will flow out from the overflow hole 3-3-2 on the small nozzle body 3-3, flow through the overflow chamber 4-3-2 of the large nozzle body 4-3 to the extrusion port, flow into the printed workpiece 8 on the printing platform 7, and then finally flow into the large nozzle path 8-1, as shown in... Figure 11 shown. As shown in... Figure 4 , 5 As shown in the working state of the small nozzle, the displacement bracket 5-3 is on the right side. The inclined plane 5-3-2 presses the small nozzle bracket 3-2 downward through the first displacement roller 3-5. The small nozzle body 3-3 reaches the working position driven by the small nozzle bracket 3-2. The inclined plane 5-3-2 presses the large nozzle bracket 4-2 upward through the second displacement roller 4-5. The large nozzle body 4-3 moves upward driven by the large nozzle bracket 4-2. At this time, the consumable 1 melts into a liquid and will be extruded from the small nozzle, while the extrusion hole of the large nozzle is blocked by the small nozzle, and the small nozzle path 8-2 in the printed workpiece 8.

[0055] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A 3D printer nozzle with a variable caliber, characterized in that: The nozzle bracket (6) comprises a feeding device (2), a small nozzle device (3), a large nozzle device (4) and a displacement device (5) which are arranged in sequence and at intervals. One end of the small nozzle device (3) is connected to the feeding device (2), and the other end is connected to the large nozzle device (4). The displacement device (5) is used to adjust the working states of the small nozzle device (3) and the large nozzle device (4). Wherein, when the large nozzle device (4) is in a working state, the consumable (1) flows into the large nozzle device (4) through the small nozzle device (3); when the small nozzle device (3) is in a working state, the large nozzle device (4) is blocked by the small nozzle device (3), and the consumable (1) flows out of the small nozzle device (3).

2. The nozzle according to claim 1, characterized in that The nozzle bracket (6) comprises a bracket body, on which a feeder mounting surface (6-1), an upper limit position (6-2), a lower limit position (6-3) and a limit switch mounting platform (6-4) are provided, wherein the upper limit position (6-2) and the lower limit position (6-3) are arranged in the middle of the bracket body, and the feeder mounting surface (6-1) and the limit switch mounting platform (6-4) are arranged at opposite ends of the bracket body; The feeding device (2) comprises a feeder, wherein the feeder has a feeder body (2-2), the feeder body (2-2) is arranged on a feeder mounting surface (6-1), a feeder gear (2-3) is arranged on the feeder body (2-2), the feeder gear (2-3) is connected to a feeder motor (2-1), and the feeder motor (2-1) is arranged on the other side of the bracket body.

3. The nozzle according to claim 1, characterized in that The small nozzle device (3) comprises a first slider (3-1) and a first displacement roller (3-5); the first slider (3-1) is slidably connected to a nozzle bracket (6) and is located below the feeding device (2); the first slider (3-1) is provided with a small nozzle bracket (3-2); The bottom of the small nozzle bracket (3-2) is connected to a small nozzle body (3-3), a spring (3-4) and a first displacement roller (3-5); the first displacement roller (3-5) is arranged on the small nozzle bracket (3-2) and is tangent to the displacement device (5).

4. The nozzle according to claim 3, characterized in that The small nozzle body (3-3) comprises a consumable channel (3-3-1) and an overflow hole (3-3-2), and the consumable channel (3-3-1) is connected to the overflow hole (3-3-2).

5. The nozzle according to claim 1, characterized in that The large nozzle device (4) comprises a large nozzle body (4-3), a second slider (4-1) is provided on the large nozzle body (4-3), the second slider (4-1) is slidably connected to a nozzle bracket (6), and a large nozzle bracket (4-2), a heating rod (4-4) and a second displacement roller (4-5) are provided on the large nozzle body (4-3); The large nozzle body (4-3) is provided with a heating rod installation hole (4-3-1) and an overflow chamber (4-3-2); the heating rod (4-4) is installed in the heating rod installation hole (4-3-1) by plugging and unplugging; and the overflow chamber (4-3-2) is connected to the small nozzle device (3).

6. The nozzle according to claim 1, characterized in that The displacement device (5) comprises a displacement body, the displacement body is arranged on the nozzle bracket (6) and is located on one side of the small nozzle device (3), and a displacement motor (5-1), an eccentric wheel (5-2), a displacement bracket (5-3), and a limit switch (5-4) are provided on the displacement body; the displacement motor (5-1) is arranged on the other side of the nozzle bracket (6), and the driving end of the displacement motor (5-1) is connected to the eccentric wheel (5-2); The limit switch (5-4) is arranged on the nozzle bracket (6), and the displacement bracket (5-3) is connected to the limit switch (5-4).

7. The nozzle according to claim 6, characterized in that The eccentric wheel (5-2) is provided with a motor mounting hole (5-2-1) and an eccentric groove (5-2-2), the eccentric groove (5-2-2) is located outside the motor mounting hole (5-2-1), and the driving end of the position changing motor (5-1) is connected to the eccentric wheel (5-2) through the motor mounting hole (5-2-1).

8. The nozzle according to claim 6, characterized in that The displacement bracket (5-3) comprises a guide column (5-3-1), and an inclined surface (5-3-2) and a limiting boss (5-3-3) are connected to the guide column (5-3-1).

9. The nozzle according to claim 8, characterized in that The cross section of the limiting boss (5-3-3) is concave.

10. The nozzle according to claim 8, characterized in that The cross section of the inclined surface (5-3-2) is U-shaped.

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