Liquid metal 3D printing equipment nozzle plugging device

Abstract

The application provides a liquid metal 3D printing equipment nozzle plugging device, and mainly relates to the technical field of 3D printing equipment. The device comprises a nozzle at the bottom of a crucible, a nozzle hole horizontally and uniformly arranged on the bottom surface of the nozzle, a plugging assembly arranged below the crucible, and a moving platform connected with the crucible. The moving platform comprises a working platform, a lifting assembly and a horizontal displacement assembly. The lifting assembly drives the horizontal displacement assembly to move up and down, and the horizontal displacement assembly drives the plugging assembly to move horizontally. The plugging rods of the plugging assembly are matched with the nozzle holes one by one, and a positioning assembly and a controller are further arranged to realize precise control. The plugging rods are made of molybdenum rods. The nozzle is plugged and unplugged from the outside of the crucible, so that the operations such as slagging and refining in the crucible are not affected, the gas protection and vacuum state are not damaged, the multi-nozzle scene is adapted, the risk of scalding caused by manual operation is eliminated, the plugging is precise, high-temperature-resistant and stable, the high-temperature working environment of the melt impact method liquid metal 3D printing is adapted, and the printing effect is effectively ensured.

Description

Technical Field

[0001] This invention mainly relates to the field of 3D printing equipment technology, specifically a nozzle sealing device for liquid metal 3D printing equipment. Background Technology

[0002] With continuous exploration of liquid metal 3D printing technology, more methods for directly molding liquid metal into metal castings and ingots have been developed. Among these is the melt impact method, in which the nozzle is a crucial component of melt impact liquid metal 3D printing equipment.

[0003] Melt impact 3D printing is a technique that uses a high-speed jet or molten metal droplets to reciprocate and print molten metal, forming high-performance castings, ingots, or composite materials. Its core principle is to refine grains by stirring and impacting the molten metal pool, utilizing the grain proliferation principle to obtain castings or ingots with fine microstructure, uniform composition, and excellent performance. The implementation of melt impact 3D printing requires a high-speed jet of molten metal. This high-speed jet is typically achieved through the pressure difference between the material ejection end and the forming end of the nozzle. Furthermore, the nozzle orifice size must be very small. Before printing, the nozzle must be closed to prevent molten metal leakage; the nozzle opens to begin printing. This necessitates a device to block the nozzle before printing and open it during printing to enable melt impact 3D printing. The device of this invention arose from this context. The nozzle assembly, in conjunction with the nozzle blocking device, allows for the smooth execution of melt impact 3D printing of molten metal.

[0004] Existing nozzle sealing devices for liquid metal 3D printing equipment mainly use a plunger-type pressure rod structure. The pressure rod is placed directly inside the crucible containing the molten metal. Before printing, the pressure rod is used to block the nozzle, and during printing, the plunger is removed from the crucible to open the nozzle. This structure has several shortcomings: 1. The pressure bar is placed in the crucible. Before printing, the oxide scale and impurities on the surface of the molten metal in the crucible need to be removed. The pressure bar will block and hinder the slag removal operation. At the same time, the degassing, refining and other processes before printing will also be interfered with by the presence of the pressure bar, affecting the pre-processing effect. 2. For printing equipment that requires gas protection and pressurization at the upper cavity outlet, the inside of the crucible must be kept sealed. Removing the pressure rod before printing will directly destroy the gas protection and vacuum environment inside the crucible, causing the metal solution to oxidize and seriously affecting the quality of the printed product. 3. This type of plunger-type pressure bar structure is only suitable for single-nozzle scenarios. For multi-nozzle devices with higher printing efficiency, it cannot achieve synchronous and precise sealing and opening, resulting in poor applicability. 4. The pressure rod is in a high-temperature environment inside the crucible for a long time. After the metal melts, the temperature inside the crucible is extremely high. If the pressure rod is removed manually, the operator is at risk of being burned by the high temperature. If it is removed mechanically, a complex high-temperature protection structure needs to be designed, which increases the equipment cost. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a nozzle sealing device for liquid metal 3D printing equipment. This device achieves nozzle sealing and opening from outside the crucible, effectively avoiding various defects of existing plunger-type pressure rod structures. It also features precise positioning, controllable opening and closing, high temperature resistance, and strong stability, making it suitable for the high-temperature working environment of melt impact liquid metal 3D printing. Furthermore, its reasonable structural design and convenient operation make it adaptable to multi-nozzle scenarios, effectively ensuring the overall effect and operational safety of liquid metal 3D printing.

[0006] To achieve the above objectives, the present invention employs the following technical solution: A nozzle sealing device for liquid metal 3D printing equipment includes a nozzle disposed at the bottom of a crucible, the nozzle being fixedly installed at the center of the bottom surface of the crucible, and several horizontally evenly distributed nozzle holes being opened on the bottom surface of the nozzle. A sealing component is disposed below the crucible opposite to the nozzle, and the sealing component is connected to the crucible via a moving platform. The moving platform includes a working platform, a lifting component, and a horizontal displacement component. The working platform is fixedly installed on the outside of the crucible, and the lifting component and the horizontal displacement component are disposed at the bottom of the working platform. The lifting component drives the horizontal displacement component to move up and down, and the sealing component is fixed to one side of the horizontal displacement component, and the horizontal displacement component drives the sealing component to move horizontally.

[0007] The sealing assembly includes a fixed plate and sealing rods. The fixed plate is driven to move horizontally by a horizontal displacement component. Several evenly distributed sealing rods are fixedly installed on the top surface of the fixed plate. The sealing rods correspond one-to-one with the nozzle holes and match each other to ensure that each nozzle hole can be accurately sealed.

[0008] The lifting assembly includes an electric telescopic rod and support blocks. The electric telescopic rods are fixedly installed on the front and rear sides of the work platform, and support blocks are fixedly installed on the lower ends of the moving rods of the electric telescopic rods. A horizontal displacement component is connected to one side of the two support blocks, and a fixed plate is located between the two support blocks. Through the synchronous extension and retraction of the two electric telescopic rods, the support blocks and the horizontal displacement component are driven to make stable up and down lifting movements.

[0009] The horizontal displacement assembly includes a screw, a screw sleeve, and an L-shaped support plate. A screw is rotatably mounted on one side of each support block. Screw sleeves are threaded onto the outside of each screw. Two screw sleeves are positioned opposite each other. An L-shaped support plate is fixedly mounted on the opposite side of each of the two L-shaped support plates. A fixing plate is fixedly mounted on the opposite side of each of the two L-shaped support plates. The two screws are connected by a synchronous drive assembly. The synchronous drive assembly drives the two screws to rotate synchronously, thereby causing the screw sleeves to move horizontally along the screws, thus achieving horizontal position adjustment of the sealing assembly.

[0010] The synchronous drive assembly includes a stepper motor, synchronous pulleys, and a synchronous belt. A vertical plate is fixedly installed at the bottom of the work platform, and a stepper motor is fixedly installed on one side of the vertical plate. The output end of the stepper motor is fixedly connected to the outer end of one of the screws. Synchronous pulleys are fixedly installed on the outside of each screw. The two synchronous pulleys are symmetrically arranged and connected by a synchronous belt. Power is provided by the stepper motor. Through the cooperation of the synchronous pulleys and the synchronous belt, the synchronous rotation of the two screws is ensured, thus ensuring the stability of the sealing assembly when moving horizontally.

[0011] The device also includes a positioning component, which includes a first rangefinder and a second rangefinder. The first rangefinder is fixedly installed on the front and rear sides of the bottom surface of the working platform, and a first target matching the first rangefinder on the same side is fixedly installed on the top surface of the support block. A second rangefinder is fixedly installed on the side of the support block facing the screw sleeve. A second target matching the second rangefinder on the same side is fixedly installed on the outer side of the screw sleeve through a bracket. Both the first and second rangefinders are laser rangefinders, which can accurately detect the lifting and horizontal positions of the sealing component through laser ranging.

[0012] The device also includes a controller, which is fixedly installed on one side of the bottom of the work platform. The controller is used to control the synchronous extension and retraction of the two electric telescopic rods. At the same time, by processing the detection data of the first and second rangefinders, the controller determines the position of the two support blocks and realizes data feedback to ensure that the two support blocks are always on the same horizontal plane during the lifting and lowering process. Furthermore, by determining the position of the support blocks, the controller determines whether the sealing rod is inserted into or removed from the nozzle hole, thereby realizing precise opening and closing control of the nozzle.

[0013] The sealing rod is a molybdenum rod. Utilizing the fact that molybdenum's melting point (2620℃) is much higher than aluminum's (660℃), it ensures that molten aluminum will not adhere to the molybdenum rod. Metallic molybdenum is relatively stable and will not react with molten aluminum in a short time, thus preventing contamination of the printing material. With a Mohs hardness of 5-5.5, molybdenum is a high-hardness metal and will not deform during the molten aluminum process, preventing device failure. The coefficient of linear expansion of molybdenum is 4.9 × 10⁻⁶ at 20-100℃. -6 / ℃, belonging to low expansion material, remains stable at high temperatures, suitable for high-temperature environments, and will not cause excessive thermal expansion deformation due to increased nozzle temperature, preventing the molybdenum rod from being unable to be removed from the nozzle; during use, the lifting component of the moving platform is used to vertically insert the molybdenum rod into the nozzle hole from bottom to top at the corresponding position of the nozzle hole, blocking the nozzle before printing, and during printing, the lifting component moves the molybdenum rod downward to remove it from the nozzle hole, and under the action of the horizontal displacement component, it moves horizontally out of the nozzle printing range without affecting the printing effect.

[0014] A counterweight is fixedly installed on the side of the work platform away from the horizontal displacement component to balance the force on the work platform, prevent the work platform from tilting due to excessive load on one side, and ensure the structural stability of the entire device.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention places the sealing component outside the crucible and uses a moving platform to raise and lower the sealing rod and move it horizontally. The sealing and opening of the nozzle is completed from the outside without extending into the crucible. This effectively avoids interference with the early process operations such as slag removal, degassing, and refining inside the crucible, ensuring the pretreatment effect of the metal solution. At the same time, it does not damage the gas protection and vacuum state of the crucible, prevents the oxidation of the metal solution, and effectively ensures the quality of the printed product. 2. The sealing rods of the present invention correspond one-to-one with the nozzle holes and match each other. Multiple sealing rods can be set according to the actual design requirements of the nozzles, which perfectly adapts to multi-nozzle printing equipment, realizes the synchronous and precise sealing and opening of multiple nozzles, and greatly improves the applicability and printing efficiency of the device. 3. The entire process of this invention is automated through a controller, eliminating the need for manual contact with the high-temperature crucible and sealing components, thus eliminating the risk of burns from manual operation. At the same time, through laser ranging and data feedback of the positioning component, the position of the sealing component is precisely controlled, ensuring accurate docking of the sealing rod and the nozzle hole, and high opening and closing control precision. 4. The sealing rod of the present invention is made of molybdenum rod. Molybdenum rod has the characteristics of high melting point, high hardness, stable chemical properties and low coefficient of linear expansion. It is perfectly adapted to the high temperature working environment of liquid metal 3D printing. It will not stick or react with the metal solution, nor will it deform or get stuck due to high temperature or thermal expansion. This ensures the long-term stable operation of the sealing device. At the same time, the sealing rod can be moved horizontally out of the nozzle printing range during printing, without obstructing the metal jet and without affecting the printing effect. 5. The mobile platform of the present invention adopts a combination structure of electric telescopic rod and screw transmission, and is equipped with synchronous drive components to ensure the smoothness and synchronicity of movement. At the same time, the working platform is equipped with counterweights to effectively balance the force and ensure the structural stability of the entire device. Moreover, the overall structural design is reasonable, the parts are highly standardized, and it is easy to install, maintain and modify later. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is the front view of the present invention; Figure 3 This is a side view schematic diagram of the installation structure of the positioning component of the present invention; Figure 4 This is a schematic diagram of the connection structure between the sealing component and the mobile platform of the present invention; Figure 5 yes Figure 4 Enlarged view of part I; Figure 6 This is a schematic diagram of the working platform and counterweight installation structure of the present invention; Figure 7 This is a schematic diagram of the assembly structure of the mobile platform of the present invention.

[0017] The following are the labels in the attached diagram: 10, crucible; 20, nozzle; 201, nozzle orifice; 30, sealing assembly; 301, fixing plate; 302, sealing rod; 40, moving platform; 401, working platform; 402, vertical plate; 50, lifting assembly; 501, electric telescopic rod; 502, support block; 60, horizontal displacement assembly; 601, screw; 602, screw sleeve; 603, L-shaped support plate; 70, synchronous drive assembly; 701, stepper motor; 702, synchronous pulley; 703, synchronous belt; 80, positioning assembly; 801, first rangefinder; 802, second rangefinder; 803, first target; 804, second target; 90, controller. Detailed Implementation

[0018] The present invention will be further described in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined in this application.

[0019] Example: A nozzle sealing device for liquid metal 3D printing equipment like Figure 1-7 As shown, a nozzle sealing device for a liquid metal 3D printing equipment has the following specific structure: The nozzle 20 is located at the bottom of the crucible 10, which is a hollow cavity structure with an open top, used to hold molten metal printing material. The nozzle 20 is fixedly welded to the center of the bottom of the crucible 10 and is connected to the inside of the crucible 10. The bottom surface of the nozzle 20 has 6 evenly distributed nozzle holes 201 along the horizontal direction. Molten metal is ejected through the nozzle holes 201 to form a jet and realize the printing operation.

[0020] A horizontally positioned work platform 401 is welded and fixed to the outside of the crucible 10. The work platform 401 is made of stainless steel and has sufficient structural strength and load-bearing capacity. A cast iron counterweight is fixed to the side of the work platform 401 away from the nozzle 20 by bolts. The weight of the counterweight matches the total weight of the lifting assembly 50, horizontal displacement assembly 60 and other components on the other side of the work platform 401 to balance the force on the work platform 401 and prevent the work platform 401 from tilting.

[0021] Electric telescopic rods 501 are bolted to the front and rear sides of the bottom of the work platform 401. The two electric telescopic rods 501 are of the same model and specifications and are synchronously connected to the controller 90 to ensure synchronized telescopic movements. Support blocks 502 are fixedly installed at the lower ends of the moving rods of each electric telescopic rod 501. The support blocks 502 are square metal blocks. A horizontally arranged screw rod 601 is rotatably mounted on one side of each support block 502 via a bearing. A threaded sleeve 602 is threaded onto the outside of each screw rod 601. The threaded sleeves 602 are symmetrically arranged front and back, and L-shaped support plates 603 are welded and fixed to the opposite sides of the two threaded sleeves 602. The two L-shaped support plates 603 are welded and fixed to the opposite sides of the fixed plate 301. The fixed plate 301 is a horizontally arranged metal plate, and six vertically upward sealing rods 302 are welded and fixed to its top surface. The sealing rods 302 are made of molybdenum rods, and their diameter matches the inner diameter of the nozzle hole 201. Their positions correspond one-to-one with the nozzle hole 201, and they can be accurately inserted into the nozzle hole 201 to achieve sealing.

[0022] The two screws 601 rotate synchronously through a synchronous drive assembly 70, which includes a stepper motor 701, a synchronous pulley 702, and a synchronous belt 703. A vertical plate 402 is welded and fixedly installed at the bottom of the working platform 401. A stepper motor 701 is fixedly installed on one side of the vertical plate 402 through a motor bracket. The stepper motor 701 is a servo stepper motor, which can realize forward and reverse rotation and precise speed control. Its output end is fixedly connected to the outer end of the front screw 601 through a coupling. The two screws 601 are both fixedly installed with synchronous pulleys 702 through key connections. The two synchronous pulleys 702 have the same specifications and are connected by a synchronous belt 703. When the stepper motor 701 starts, it can drive the two screws 601 to rotate synchronously and at the same speed, thereby driving the screw sleeve 602 to move horizontally along the screws 601, realizing the horizontal position adjustment of the fixing plate 301 and the sealing rod 302.

[0023] The device also includes a positioning component 80, which comprises a first rangefinder 801 and a second rangefinder 802, both of which are laser rangefinders with a measurement accuracy of up to 0.1 mm. The first rangefinder 801 is fixedly installed on the front and rear sides of the bottom surface of the working platform 401 by brackets. The top surface of the support block 502 is welded with a first target 803 that matches the first rangefinder 801 on the same side. The first rangefinder 801 emits a laser to the first target 803, which can accurately detect the lifting height of the support block 502 and thus determine the vertical position of the sealing rod 302. The side of the support block 502 facing the screw sleeve 602 is fixedly installed with a second rangefinder 802 by brackets. The outer side of the screw sleeve 602 is welded with a second target 804 that matches the second rangefinder 802 on the same side by brackets. The second rangefinder 802 emits a laser to the second target 804, which can accurately detect the horizontal displacement distance of the screw sleeve 602 and thus determine the horizontal position of the sealing rod 302.

[0024] A controller 90 is fixedly installed on one side of the bottom surface of the work platform 401 via a protective box. In this embodiment, the controller 90 is a PLC controller, equipped with a motherboard, memory module, storage medium, and mains power supply. The signal input terminal of the controller 90 is electrically connected to the first rangefinder 801 and the second rangefinder 802 to receive distance measurement data. The signal output terminal of the controller 90 is electrically connected to the electric telescopic rod 501 and the stepper motor 701 to control their actions. The controller 90 can control the synchronous extension and retraction of the two electric telescopic rods 501. At the same time, by processing the detection data of the first rangefinder 801 and the second rangefinder 802, it judges the position of the two support blocks 502, realizes real-time data feedback, and ensures that the two support blocks 502 are always on the same horizontal plane during the lifting and lowering process. This avoids the sealing rod 302 tilting and failing to accurately insert into the nozzle hole 201. At the same time, by judging the position of the support block 502, it accurately controls the insertion or removal of the sealing rod 302 into the nozzle hole 201, realizing the automated opening and closing control of the nozzle 20.

[0025] The working principle described above is as follows: During the pre-printing preparation stage, the controller 90 controls the stepper motor 701 to start, which drives the screw 601 to rotate through the synchronous drive component 70. This causes the screw sleeve 602 to move the sealing component 30 horizontally to directly below the nozzle 20, at which point the sealing rod 302 is precisely aligned with the nozzle hole 201. Subsequently, the controller 90 controls the two electric telescopic rods 501 to retract synchronously, driving the support block 502 and the sealing component 30 to move upward until the sealing rod 302 is vertically inserted into the nozzle hole 201 from bottom to top, thus sealing the nozzle 20 and preventing the molten metal in the crucible 10 from flowing out.

[0026] When printing begins, the controller 90 first controls the two electric telescopic rods 501 to retract synchronously, driving the sealing rod 302 to move downwards and completely out of the nozzle hole 201. Then, it controls the stepper motor 701 to reverse, driving the sealing component 30 to move horizontally to the outside of the printing range of the nozzle 20, so as to avoid obstructing the metal jet. At this time, the molten metal in the crucible 10 forms a high-speed jet through the nozzle hole 201 under the action of pressure difference, and the printing operation begins.

[0027] After printing is completed, the controller 90 first controls the stepper motor 701 to rotate forward, driving the sealing component 30 to move horizontally to directly below the nozzle 20, and then controls the electric telescopic rod 501 to retract, so that the sealing rod 302 can be inserted into the nozzle hole 201 again to achieve sealing, thus completing the nozzle opening and closing control of the entire printing operation.

[0028] The location of the controller in this solution is set by the staff according to the actual situation during operation. The controller is used to control the electrical components used in this solution, including but not limited to sensors, motors, telescopic rods, displays, computer input devices, switches, communication devices, lights, speakers, and microphones. The controller is an Intel processor, AMD processor, PLC controller, ARM processor, or microcontroller. It is used in conjunction with a motherboard, memory modules, storage media, and power supply, which is AC power or a lithium battery. When a display screen is provided, a graphics card is also included. For the operating principle of the controller, please refer to "Principles of Automatic Control," "Microcontroller Principles and Application Simulation Cases," and "Sensor Principles and Applications" published by Tsinghua University Press. Other books in this field can also be consulted. Other automation control and electrical components not mentioned are knowledge well known to those skilled in the art and will not be described in detail here.

[0029] In explaining this invention, it should be noted that the terms indicating location are used only for ease of description and understanding, and are not intended to limit the installation location of specific technical features. Other possible installation methods are not excluded.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A nozzle sealing device for a liquid metal 3D printing equipment, comprising a nozzle (20) disposed at the bottom of a crucible (10), the nozzle (20) being fixedly installed at the center of the bottom surface of the crucible (10), characterized in that: The bottom surface of the nozzle (20) is provided with several nozzle holes (201) that are evenly distributed in the horizontal direction. The bottom of the crucible (10) is provided with a sealing assembly (30) that is opposite to the nozzle (20). The sealing assembly (30) is connected to the crucible (10) through a moving platform (40). The mobile platform (40) includes a working platform (401), a lifting component (50), and a horizontal displacement component (60). The working platform (401) is fixedly installed on the outside of the crucible (10). The bottom of the working platform (401) is provided with a lifting component (50) and a horizontal displacement component (60). The lifting component (50) drives the horizontal displacement component (60) to move up and down. The sealing component (30) is fixed on one side of the horizontal displacement component (60), and the horizontal displacement component (60) drives the sealing component (30) to move horizontally.

2. The nozzle sealing device for liquid metal 3D printing equipment according to claim 1, characterized in that: The sealing assembly (30) includes: A fixed plate (301) is driven to move horizontally by a horizontal displacement assembly (60); A sealing rod (302) is fixedly installed on the top surface of the fixing plate (301) with several evenly distributed sealing rods (302). The sealing rods (302) correspond one-to-one with the nozzle holes (201) and match each other.

3. The nozzle sealing device for liquid metal 3D printing equipment according to claim 2, characterized in that: The lifting assembly (50) includes: Electric telescopic rod (501), the electric telescopic rod (501) is fixedly installed on the front and rear sides of the working platform (401). The lower end of the moving rod of the electric telescopic rod (501) is fixedly installed with the support block (502). A horizontal displacement component (60) is connected to one side of the two support blocks (502), and the fixing plate (301) is located between the two support blocks (502).

4. The nozzle sealing device for liquid metal 3D printing equipment according to claim 3, characterized in that: The horizontal displacement component (60) includes: Screw (601), and screws (601) are rotatably mounted on one side of the support block (502); Screw sleeve (602), the screw (601) is externally threaded to install the screw sleeve (602), and the two screw sleeves (602) are arranged opposite to each other; L-shaped support plate (603), L-shaped support plate (603) is fixedly installed on the opposite side of the two screw sleeves (602), and fixing plate (301) is fixedly installed on the opposite side of the two L-shaped support plates (603). The two screws (601) are connected by a synchronous drive assembly (70).

5. The nozzle sealing device for liquid metal 3D printing equipment according to claim 4, characterized in that: The synchronous drive component (70) includes: A stepper motor (701) is fixedly installed on the bottom of the working platform (401) with a vertical plate (402). A stepper motor (701) is fixedly installed on one side of the vertical plate (402). The output end of the stepper motor (701) is fixedly connected to the outer end of one of the screws (601). Synchronous pulleys (602) are fixedly installed on the outside of the screw (601), and the two synchronous pulleys (602) are arranged symmetrically. The synchronous belt (603) connects the two synchronous pulleys (602) via the synchronous belt (603).

6. The nozzle sealing device for liquid metal 3D printing equipment according to claim 5, characterized in that: It also includes a positioning component (80), which includes a first rangefinder (801) and a second rangefinder (802). The first rangefinder (801) is fixedly installed on the front and rear sides of the bottom surface of the working platform (401). The top surface of the support block (502) is fixedly installed with a first target (803) that matches the first rangefinder (801) on the same side. The second rangefinder (802) is fixedly installed on the side of the support block (502) facing the screw sleeve (602). The outer side of the screw sleeve (602) is fixedly installed with a second target (804) that matches the second rangefinder (802) on the same side through a bracket.

7. The nozzle sealing device for liquid metal 3D printing equipment according to claim 6, characterized in that: It also includes a controller (90), which is fixedly installed on one side of the bottom surface of the work platform (401). The controller (90) is used to control the synchronous extension and retraction of the two electric telescopic rods (501). At the same time, by processing the detection data of the first rangefinder (801) and the second rangefinder (802), the controller judges the position of the two support blocks (502) to realize data feedback, ensuring that the two support blocks (502) are always on the same horizontal plane during the lifting and lowering process. Furthermore, by judging the position of the support blocks (502), the controller determines whether the sealing rod (302) is inserted into or removed from the nozzle hole (201) to realize the opening and closing control of the nozzle (20).

8. The nozzle sealing device for liquid metal 3D printing equipment according to claim 2, characterized in that: The plugging rod (302) is a molybdenum rod.

9. The nozzle sealing device for liquid metal 3D printing equipment according to claim 1, characterized in that: A counterweight is fixedly installed on the side of the working platform (401) away from the horizontal displacement component (60).

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