Leak-proof material spray head device and working method

Abstract

The application discloses a leakage-proof material nozzle device and a working method. The device comprises a discharging barrel, a fixing part, a rotating part, a first magnetic mechanism and a second magnetic mechanism. The discharging barrel is internally provided with a cavity. The fixing part is fixedly arranged in the cavity, and the fixing part is internally provided with a first flow channel. The rotating part is rotatably arranged in the cavity, and the rotating part is internally provided with a second flow channel. The first magnetic mechanism is used for generating a first magnetic field to drive the rotating part to rotate. The second magnetic mechanism is used for generating a second magnetic field to drive the rotating part to move close to or away from the fixing part. Through the combined action of the first magnetic mechanism and the second magnetic mechanism on the rotating part, the rotating part can be switched between a connection state and a blocking state. When printing is in flight, the second flow channel is not communicated with the first flow channel, so as to prevent the material from continuously dripping. Moreover, the rotating part does not move along the axial direction of the discharging barrel, thereby reducing the load pressure of the magnetic mechanism.

Description

Technical Field

[0001] This invention relates to the field of additive manufacturing molten particle printing equipment technology, and in particular to a leak-proof nozzle device and its working method. Background Technology

[0002] Due to the inherent viscoelastic memory effect of polymer melts and the residual fluid dynamic pressure within the flow channel, when the printer nozzle completes printing along a certain path and prepares to move across a non-printing area to the next starting point (for a print run), the melt will inevitably continue to seep out or be drawn into fine filaments from the nozzle tip. This not only severely contaminates the surface of the printed parts, reducing surface smoothness, but the overflowing material can also cause serious mechanical interference and collisions. Existing anti-leakage technologies mainly rely on the following two paths: The first method is the screw reversal and pressure reduction method. This method reverses the extrusion screw to make the melt tend to move upwards, thus preventing it from dripping downwards. However, due to the viscosity of the melt, this method not only has a severely delayed response but also easily entangles external air, leading to "bubbling," flow interruption, or material thermal degradation during resuming printing. The second method is the built-in direct-acting physical valve (needle valve / plunger valve) method. By setting the opening and closing of these valves, the outlet can be closed during no-load operation to prevent melt dripping. However, the valve stem of this type of valve needs to withstand extremely high fluid frontal extrusion forces during axial pushing and pulling in high-temperature viscous melt. Furthermore, long-term immersion can easily lead to complete jamming due to carbonization and deposition of residual material in dead corners. Additionally, placing the drive component near the high-temperature zone can easily cause coil aging, short circuits, or high-temperature demagnetization, resulting in a short equipment lifespan and an extremely high failure rate. Summary of the Invention

[0003] The present invention aims to at least solve one of the aforementioned technical problems existing in the prior art. To this end, this application proposes a leak-proof nozzle device that can prevent molten material from dripping outwards during printing dry runs, and the device has higher reliability and stability.

[0004] This application also proposes an additive printing device having the above-mentioned anti-leakage nozzle device, and a working method based on the above-mentioned anti-leakage nozzle device.

[0005] According to a first aspect embodiment of this application, the anti-leakage nozzle device includes: The discharge cylinder has an internal cavity; A fastener is fixedly disposed in the cavity, and a first flow channel is provided inside the fastener; A rotating component is rotatably disposed in the cavity, and a second flow channel is provided inside the rotating component. The rotating component is a magnetic component. A first magnetic mechanism is connected to the discharge cylinder to generate a first magnetic field, which drives the rotating component to rotate. A second magnetic mechanism is connected to the discharge cylinder to generate a second magnetic field, which drives the rotating member to move closer to or away from the fixed member. The rotating component includes an on state and a blocked state. When the rotating component is in the on state, the second flow channel is connected to the first flow channel. When the rotating component is in the blocked state, the second flow channel and the first flow channel are offset from each other.

[0006] The anti-leakage nozzle device according to the embodiments of this application has at least the following beneficial effects: through the combined action of the first magnetic mechanism and the second magnetic mechanism on the rotating part, the rotating part can switch between the on state and the off state. When the printing is running empty, the second flow channel in the rotating part is not connected with the first flow channel in the fixed part, thereby preventing the material from continuing to drip; moreover, since the rotating part does not move along the axial direction of the discharge cylinder, it does not need to resist the squeezing force of the material fluid, thereby reducing the load pressure on the magnetic mechanism and helping to extend its working life.

[0007] According to some embodiments of this application, the rotation axis of the rotating member coincides with the central axis of the fixed member.

[0008] According to some embodiments of this application, the fixing member is provided with a plurality of first flow channels, and the rotating member is provided with a plurality of second flow channels, wherein the number of the first flow channels and the number of the second flow channels are the same and they are arranged in a one-to-one correspondence.

[0009] According to some embodiments of this application, each of the first flow channels is arranged in a circular array around the central axis of the fixed member, and each of the second flow channels is arranged in a circular array around the central axis of the rotating member.

[0010] According to some embodiments of this application, a converging cavity is provided at the bottom of the cavity, and the converging cavity is in communication with each of the second flow channels.

[0011] According to some embodiments of this application, the anti-leakage nozzle device further includes a nozzle, which is detachably connected to the discharge cylinder and connected to the converging cavity.

[0012] According to some embodiments of this application, the outer surface of the fastener is covered with a high-temperature resistant, non-magnetic outer shell.

[0013] According to some embodiments of this application, the anti-leakage nozzle device further includes an extrusion motor, an extrusion screw, and a heating device. The extrusion screw is rotatably disposed in the cavity and is connected to the rotating shaft of the extrusion motor. The heating device is installed outside the discharge cylinder to transfer heat to the discharge cylinder.

[0014] An additive manufacturing apparatus according to a second aspect of this application includes an additive manufacturing apparatus body and the aforementioned anti-leakage nozzle device, wherein the anti-leakage nozzle device is connected to the additive manufacturing apparatus body.

[0015] The working method according to the third aspect of this application, which is based on the above-described anti-leakage nozzle device, includes a normal discharge method and an empty-run sealing method, wherein: The normal discharge method includes: Determine whether the rotating component is currently in an on / off state; If the rotating component is in a blocked state, the second magnetic mechanism is activated, driving the rotating component to move away from the fixed component; The first magnetic mechanism is activated, driving the rotating component to rotate until the rotating component is in the energized state; The second magnetic mechanism drives the rotating member to move closer to the fixed member until the rotating member is in close contact with the fixed member; The material inside the discharge cylinder is transformed into a fluid state under high temperature and high pressure, and flows through the cavity, the first flow channel and the second flow channel in sequence, and is finally discharged from the discharge cylinder; The empty-running blocking method includes: Stop the discharge from the discharge cylinder; Determine whether the rotating component is currently in a blocked state; If the rotating component is in the ON state, the second magnetic mechanism is activated, driving the rotating component to move away from the fixed component. The first magnetic mechanism is activated, driving the rotating component to rotate until the rotating component is in a blocked state; The second magnetic mechanism drives the rotating member to move closer to the fixed member until the rotating member is in close contact with the fixed member; The material in the discharge cylinder cannot flow from the first flow channel to the second flow channel, thereby preventing the material from dripping out of the discharge cylinder.

[0016] The working method according to the embodiments of this application has at least the following beneficial effects: the second magnetic mechanism can adjust the rotational friction between the rotating member and the fixed member, and the first magnetic mechanism can adjust the rotation angle of the rotating member. Thus, by jointly controlling the first magnetic mechanism and the second magnetic mechanism, the rotating member can switch between the on state and the off state.

[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0018] The accompanying drawings are used to provide a further understanding of the technical solutions disclosed in this application and form part of the specification. They are used together with the embodiments disclosed in this application to explain the technical solutions of this application and do not constitute a limitation on the technical solutions disclosed in this application.

[0019] Figure 1 This is a schematic diagram of the structure of the anti-leakage nozzle device according to the first aspect of this application; Figure 2 This is a side view of the leak-proof nozzle device according to the first aspect of this application; Figure 3 for Figure 2 Sectional view at point AA.

[0020] Reference numerals: 100-discharge cylinder, 110-cavity, 120-converging cavity, 130-feed pipe, 200-fixed component, 210-first flow channel, 220-rotating groove, 300-rotating component, 310-second flow channel, 320-rotating protrusion, 400-first magnetic mechanism, 500-second magnetic mechanism, 600-nozzle, 700-extrusion motor, 800-extrusion screw. Detailed Implementation

[0021] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0022] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0023] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0024] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0025] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0026] Due to the inherent viscoelastic memory effect of polymer melts and the residual fluid dynamic pressure within the flow channel, when the printer nozzle completes printing along a certain path and prepares to move across a non-printing area to the next starting point (for a print run), the melt will inevitably continue to seep out or be drawn into fine filaments from the nozzle tip. This not only severely contaminates the surface of the printed parts, reducing surface smoothness, but the overflowing material can also cause serious mechanical interference and collisions. Existing anti-leakage technologies mainly rely on the following two paths: The first method is the screw reversal and pressure reduction method. This method reverses the extrusion screw to make the melt tend to move upwards, thus preventing it from dripping downwards. However, due to the viscosity of the melt, this method not only has a severely delayed response but also easily entangles external air, leading to "bubbling," flow interruption, or material thermal degradation during resuming printing. The second method is the built-in direct-acting physical valve (needle valve / plunger valve) method. By setting the opening and closing of these valves, the outlet can be closed during no-load operation to prevent melt dripping. However, the valve stem of this type of valve needs to withstand extremely high fluid frontal extrusion forces during axial pushing and pulling in high-temperature viscous melt. Furthermore, long-term immersion can easily lead to complete jamming due to carbonization and deposition of residual material in dead corners. Additionally, placing the drive component near the high-temperature zone can easily cause coil aging, short circuits, or high-temperature demagnetization, resulting in a short equipment lifespan and an extremely high failure rate.

[0027] In response, this application proposes a leak-proof nozzle device. Through the combined action of the first and second magnetic mechanisms on the rotating component, the rotating component can switch between an on and off state. During the printing run without load, the second flow channel in the rotating component is not connected to the first flow channel in the fixed component, thereby preventing the material from continuing to drip. Moreover, since the rotating component does not move along the axial direction of the discharge cylinder, it does not need to resist the extrusion pressure of the material fluid, thereby reducing the load pressure on the magnetic mechanism and extending its service life.

[0028] Furthermore, this application also proposes an additive manufacturing apparatus including the aforementioned anti-leakage nozzle device, and a method of operation based on the aforementioned anti-leakage nozzle device. In this method, the second magnetic mechanism can adjust the rotational friction between the rotating component and the fixed component, and the first magnetic mechanism can adjust the rotation angle of the rotating component. Thus, by jointly controlling the first and second magnetic mechanisms, the rotating component can be switched between an on state and a blocked state.

[0029] Reference Figures 1 to 3 The leak-proof nozzle device in the first aspect embodiment of this application includes a discharge cylinder 100, a fixing member 200, a rotating member 300, a first magnetic mechanism 400, and a second magnetic mechanism 500. The discharge cylinder 100 is the main structure of the leak-proof nozzle device, and it has an internal cavity 110. Material can enter the cavity 110 from the feed pipe 130 on one side, and is subjected to extrusion pressure and heat within the cavity 110 to form a flowable fluid. Both the fixing member 200 and the rotating member 300 are disposed within the cavity 110 of the discharge cylinder 100. The fixing member 200 is fixed within the cavity 110, while the rotating member 300 can rotate. Thus, when the rotating member 300 rotates, the communication state between the flow channel on the rotating member 300 and the flow channel on the fixing member 200 can be switched. The first magnetic mechanism 400 is used to drive the rotating member 300 to rotate, thereby switching the working state of the rotating member 300. The second magnetic mechanism 500 is used to drive the rotating member 300 to move closer to or further away from the fixed member 200, thereby adjusting the frictional resistance between the rotating member 300 and the fixed member 200.

[0030] Specifically, the fixing member 200 is fixedly disposed in the cavity 110, and a first flow channel 210 is provided inside the fixing member 200. The first flow channel 210 is connected to the cavity 110, and the extension direction of the first flow channel 210 is the same as the length direction of the cavity 110, so that the material can flow into the first flow channel 210 after being squeezed.

[0031] The rotating component 300 is rotatably disposed in the cavity 110, and a second flow channel 310 is formed inside the rotating component 300. The second flow channel 310 can connect with the first flow channel 210, so that the material in the first flow channel 210 can flow into the second flow channel 310, and finally flow to the end of the cavity 110 and be discharged outward. It is worth noting that the rotating component 300 is a magnetic component, which can rotate and move under the influence of magnetic force.

[0032] The first magnetic mechanism 400 is connected to the discharge cylinder 100 to generate a first magnetic field, which drives the rotating component 300 to rotate. Specifically, the first magnetic mechanism 400 generates the first magnetic field using the principle of electromagnetic induction, thereby applying a magnetic force to the rotating component 300.

[0033] The second magnetic mechanism 500 is connected to the discharge cylinder 100 to generate a second magnetic field, which drives the rotating component 300 to move closer to or away from the fixed component 200. Thus, when the rotating component 300 moves away from the fixed component 200, the frictional resistance between them is low, allowing the rotating component 300 to rotate easily; when the rotating component 300 is close to the fixed component 200, the frictional resistance is high, locking the rotating component 300 and preventing it from rotating, thus acting as a limiting mechanism. Specifically, the second magnetic mechanism 500 uses the principle of electromagnetic induction to generate the second magnetic field, thereby applying magnetic force to the rotating component 300.

[0034] It is easy to understand that, in order to prevent fluid material from flowing between the rotating part 300 and the fixed part 200, the gap between the two should be strictly controlled when the rotating part 300 moves away from the fixed part 200, and the strength of the second magnetic field applied to the second magnetic mechanism 500 needs to be precisely adjusted.

[0035] The working principle of the anti-leakage nozzle device is as follows: The rotating component 300 includes an on state and a blocking state. When the rotating component 300 is in the on state, the second flow channel 310 is connected to the first flow channel 210, and the fluid material can be discharged outward through the first flow channel 210 and the second flow channel 310. When the rotating component 300 is in the blocking state, the second flow channel 310 and the first flow channel 210 are offset from each other, and the fluid material is trapped in the first flow channel 210, thereby preventing the material from being discharged from the discharge cylinder 100. When it is necessary to switch the working state of the rotating component 300, the second magnetic mechanism 500 first moves the rotating component 300 away from the fixed component 200, then the first magnetic mechanism 400 drives the rotating component 300 to rotate, and finally the second magnetic mechanism 500 drives the rotating component 300 to approach and abut against the fixed component 200, thus completing the switching of the working state of the rotating component 300.

[0036] Furthermore, the rotation axis of the rotating member 300 coincides with the central axis of the fixed member 200. The rotating member 300 is provided with a rotating protrusion 320 in the center, and the fixed member 200 is provided with a rotating groove 220 in the center. The rotating protrusion 320 can extend into the rotating groove 220 to restrict the rotation axis of the rotating member 300 on the central axis of the fixed member 200, so as to prevent the rotating member 300 from deviating when rotating.

[0037] Furthermore, the fixed component 200 is provided with multiple first flow channels 210, and the rotating component 300 is provided with multiple second flow channels 310. The number of first flow channels 210 and second flow channels 310 are the same and they are arranged in a one-to-one correspondence. By increasing the number of first flow channels 210 and second flow channels 310, the molten material can be made to flow quickly through each flow channel and be discharged outward, thereby improving the discharge efficiency.

[0038] Furthermore, each of the first flow channels 210 is arranged in a circular array around the central axis of the fixed member 200, so that the material can enter into each of the first flow channels 210 evenly; each of the second flow channels 310 is arranged in a circular array around the central axis of the rotating member 300, so that the material in each of the second flow channels 310 can be discharged outwards evenly.

[0039] Furthermore, a converging cavity 120 is provided at the bottom of the cavity 110. The converging cavity 120 is connected to each of the second flow channels 310, so that the material flowing out from each of the second flow channels 310 can be gathered in the converging cavity 120 and finally discharged outward. Specifically, the converging cavity 120 is generally a conical cavity structure, with its large-diameter end connected to the rotating member 300 and its small-diameter end used for the final extrusion of material.

[0040] Furthermore, the anti-leakage nozzle device also includes a nozzle 600, which is detachably connected to the discharge cylinder 100, allowing the user to replace the nozzle 600 with one of different orifice diameters to change the printing accuracy as needed. It is worth noting that the nozzle 600 is connected to the converging cavity 120, specifically to the small-diameter end of the converging cavity 120.

[0041] Furthermore, referring to Figure 2 The feed pipe 130 and the discharge cylinder 100 are set at an acute angle to each other, so that the material entering from the feed pipe 130 can flow into the discharge cylinder 100 more smoothly.

[0042] Furthermore, the outer surface of the fastener 200 is covered with a high-temperature resistant, non-magnetic shell, which ensures that the fastener 200 will not move due to the magnetic force of the first magnetic mechanism 400 or the second magnetic mechanism 500.

[0043] Furthermore, the anti-leakage nozzle device also includes an extrusion motor 700, an extrusion screw 800, and a heating device. The extrusion screw 800 is rotatably disposed within the cavity 110 and is connected to the rotating shaft of the extrusion motor 700, thereby enabling the extrusion motor 700 to drive the extrusion screw 800 to rotate, and the material is moved by the helical blades on the outer side of the extrusion screw 800. The heating device is installed outside the discharge cylinder 100 to transfer heat to the discharge cylinder 100, causing the material inside the discharge cylinder 100 to melt.

[0044] The additive manufacturing equipment in the second aspect of this application includes an additive manufacturing equipment body and the aforementioned anti-leakage nozzle device, wherein the anti-leakage nozzle device is connected to the additive manufacturing equipment body.

[0045] The working method in the third aspect embodiment of this application is based on the above-mentioned anti-leakage nozzle device, and includes a normal material discharge method and an empty-run sealing method, wherein: The normal discharge method includes the following steps: S110. Determine whether the rotating component 300 is in the ON state. If the rotating component 300 is in the ON state, proceed directly to step S150. S120. If the rotating part 300 is in a blocked state, the state of the rotating part 300 needs to be switched; the second magnetic mechanism 500 is activated, driving the rotating part 300 to move away from the fixed part 200, thereby reducing the frictional resistance between the rotating part 300 and the fixed part 200, making it easier to drive the rotating part 300 to rotate in the future. S130. The first magnetic mechanism 400 is activated, driving the rotating component 300 to rotate until the rotating component 300 is in the connected state. At this time, the second flow channel 310 is connected to the first flow channel 210. S140. The second magnetic mechanism 500 drives the rotating part 300 to move closer to the fixed part 200 until the rotating part 300 is in close contact with the fixed part 200. This is to prevent material from seeping into the gap between the rotating part 300 and the fixed part 200, and also to increase the frictional resistance between the rotating part 300 and the fixed part 200, so that the rotating part 300 is not easy to rotate randomly. S150. Start the extrusion motor 700 and heating device. The material in the discharge cylinder 100 is transformed into a fluid state under high temperature and high pressure, and flows through the cavity 110, the first flow channel 210 and the second flow channel 310 in sequence, and is finally discharged from the discharge cylinder 100 to complete the discharge.

[0046] The empty-running blocking method includes the following steps: S210. Stop the continued discharge from the discharge cylinder 100; the material inside the discharge cylinder 100 tends to stagnate. S220. Determine whether the rotating component 300 is currently in a blocked state; if the rotating component 300 is in a blocked state, you can directly print out an empty run; S230. If the rotating component 300 is in the ON state, the state of the rotating component 300 needs to be switched; the second magnetic mechanism 500 is activated, driving the rotating component 300 to move away from the fixed component 200, thereby reducing the frictional resistance between the rotating component 300 and the fixed component 200, making it easier to drive the rotating component 300 to rotate in the future. S240. The first magnetic mechanism 400 is activated, driving the rotating component 300 to rotate until the rotating component 300 is in a blocked state. At this time, the second flow channel 310 is misaligned with the first flow channel 210 and is not connected to each other. S250. The second magnetic mechanism 500 drives the rotating part 300 to move closer to the fixed part 200 until the rotating part 300 is in close contact with the fixed part 200. This is to prevent material from seeping into the gap between the rotating part 300 and the fixed part 200, and also to increase the frictional resistance between the rotating part 300 and the fixed part 200, so that the rotating part 300 is not easy to rotate randomly. S260. The material in the discharge cylinder 100 cannot flow through the first flow channel 210 to the second flow channel 310, thereby preventing the material from dripping out of the discharge cylinder 100.

[0047] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

Claims

1. A leak-proof nozzle device, characterized in that, include: The discharge cylinder has an internal cavity; A fastener is fixedly disposed in the cavity, and a first flow channel is provided inside the fastener; A rotating component is rotatably disposed in the cavity, and a second flow channel is provided inside the rotating component. The rotating component is a magnetic component. A first magnetic mechanism is connected to the discharge cylinder to generate a first magnetic field, which drives the rotating component to rotate. A second magnetic mechanism is connected to the discharge cylinder to generate a second magnetic field, which drives the rotating member to move closer to or away from the fixed member. The rotating component includes an on state and a blocked state. When the rotating component is in the on state, the second flow channel is connected to the first flow channel. When the rotating component is in the blocked state, the second flow channel and the first flow channel are offset from each other.

2. The leak-proof nozzle device according to claim 1, characterized in that: The rotation axis of the rotating component coincides with the central axis of the fixed component.

3. The leak-proof nozzle device according to claim 2, characterized in that: The fixing component is provided with multiple first flow channels, and the rotating component is provided with multiple second flow channels. The number of first flow channels and second flow channels are the same and they are arranged in a one-to-one correspondence.

4. The leak-proof nozzle device according to claim 3, characterized in that: Each of the first flow channels is arranged in a circular array around the central axis of the fixed member, and each of the second flow channels is arranged in a circular array around the central axis of the rotating member.

5. The leak-proof nozzle device according to claim 3, characterized in that: A converging cavity is provided at the bottom of the cavity, and the converging cavity is connected to each of the second flow channels.

6. The leak-proof nozzle device according to claim 5, characterized in that: The leak-proof nozzle device also includes a nozzle, which is detachably connected to the discharge cylinder and connected to the converging cavity.

7. The leak-proof nozzle device according to claim 1, characterized in that: The outer surface of the fastener is covered with a high-temperature resistant, non-magnetic shell.

8. The leak-proof nozzle device according to claim 1, characterized in that: The leak-proof nozzle device also includes an extrusion motor, an extrusion screw, and a heating device. The extrusion screw is rotatably disposed in the cavity and is connected to the rotating shaft of the extrusion motor. The heating device is installed outside the discharge cylinder to transfer heat to the discharge cylinder.

9. An additive manufacturing apparatus, characterized in that, It includes an additive manufacturing equipment body and a leak-proof nozzle device as described in any one of claims 1 to 8, wherein the leak-proof nozzle device is connected to the additive manufacturing equipment body.

10. A method of operation, based on the anti-leakage nozzle device according to any one of claims 1 to 8, characterized in that, This includes normal discharge methods and empty-run sealing methods, among which: The normal discharge method includes: Determine whether the rotating component is currently in an on / off state; If the rotating component is in a blocked state, the second magnetic mechanism is activated, driving the rotating component to move away from the fixed component; The first magnetic mechanism is activated, driving the rotating component to rotate until the rotating component is in the energized state; The second magnetic mechanism drives the rotating member to move closer to the fixed member until the rotating member is in close contact with the fixed member; The material inside the discharge cylinder is transformed into a fluid state under high temperature and high pressure, and flows through the cavity, the first flow channel and the second flow channel in sequence, and is finally discharged from the discharge cylinder; The empty-running blocking method includes: Stop the discharge from the discharge cylinder; Determine whether the rotating component is currently in a blocked state; If the rotating component is in the ON state, the second magnetic mechanism is activated, driving the rotating component to move away from the fixed component. The first magnetic mechanism is activated, driving the rotating component to rotate until the rotating component is in a blocked state; The second magnetic mechanism drives the rotating member to move closer to the fixed member until the rotating member is in close contact with the fixed member; The material in the discharge cylinder cannot flow from the first flow channel to the second flow channel, thereby preventing the material from dripping out of the discharge cylinder.

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