Crucible nanometer mixed coating spraying device

Abstract

This invention relates to the field of spraying equipment technology, and provides a crucible nano-hybrid coating spraying device, including a rotating support platform, a robotic arm with an atomizing spray gun at the execution end, and a controller. The atomizing spray gun includes two atomizing nozzles arranged symmetrically at the center, both inclined tangentially along the crucible, one inclined upwards and the other downwards, and both have built-in on / off valves. The controller is electrically connected to the two on / off valves, thereby controlling the opening of a single nozzle or both nozzles simultaneously, and coordinating with the lifting of the robotic arm and the rotation of the crucible to achieve inner wall spraying. The crucible nano-hybrid coating spraying device provided by this invention, by adopting dual tangential atomizing nozzles and independently controlling their opening and closing, can achieve synchronous bidirectional spraying of two nozzles, improving the thin-film spraying rhythm. In addition, by alternating spraying with the upper and lower nozzles, the film layers are staggered and complementary, avoiding flow marks and thickness deviations, ensuring uniformity, and if one nozzle fails, the other nozzle can continue to operate, ensuring production continuity.

Description

Technical Field

[0001] This invention relates to the field of spraying equipment technology, and more specifically to a crucible nano-mixed coating spraying device. Background Technology

[0002] Crucibles are containers that are resistant to high temperatures and chemical corrosion. They are commonly used in processes such as high-temperature melting and crystal growth. Before normal use, the inner wall of the crucible needs to be coated. For example, nano-sized powders are mixed with binders to form a stable slurry. The nano-mixed slurry is then evenly sprayed onto the inner wall of the crucible through the atomization operation of a spraying device to form a uniform, dense, and high-temperature resistant protective layer.

[0003] Existing spraying equipment places the crucible on a rotating frame before spraying, allowing the crucible to rotate with the frame. Then, it uses components such as robotic arms on the spraying equipment to control the atomizing spray gun to extend into the crucible to complete the coating process.

[0004] However, the above-mentioned spraying device still has the following aspects to be optimized during multiple thin spraying processes: the atomizing spray gun usually uses a single nozzle with a long spraying path and a long construction cycle, and unidirectional spraying is prone to forming flow marks and streaks on the coating surface, which may affect the unevenness of the coating thickness and poor flatness; in addition, once a single nozzle is blocked or malfunctions, it is necessary to stop the machine for maintenance. Summary of the Invention

[0005] To overcome the above-mentioned defects, embodiments of the present invention provide a crucible nano-hybrid coating spraying device, which solves the technical problems in the related technology such as the need to improve the spraying efficiency of a single nozzle, the easy generation of flow marks and thickness deviations on the coating surface, and the need to stop for maintenance after a single nozzle is blocked or malfunctions.

[0006] At least one embodiment of the present invention provides a crucible nano-hybrid coating spraying device for spraying a nano-hybrid coating onto the inner wall of a crucible, comprising: A rotating support platform, which is used to support and drive the crucible to rotate; A robotic arm is provided with an atomizing spray gun at its execution end. The robotic arm can drive the atomizing spray gun to extend into the crucible for spraying the inner wall. The atomizing spray gun includes two atomizing nozzles that are centrally symmetrical and arranged tangentially along the crucible. One atomizing nozzle is inclined upward and the other atomizing nozzle is inclined downward. Each atomizing nozzle is provided with an on / off valve for sealing the atomizing nozzle. The controller is electrically connected to both of the opening and closing valves. The controller is used to send a first control command to one of the atomizing nozzles to control the corresponding atomizing nozzle to open, and / or send a second control command to the other atomizing nozzle to control the corresponding atomizing nozzle to open, so that either of the atomizing nozzles opens, or that both atomizing nozzles open synchronously.

[0007] According to one embodiment of this application, the robotic arm is used to drive the atomizing spray gun to reciprocate up and down, and further includes: A position sensor is used to detect the height position of the atomizing nozzle and send a position signal to the controller. The controller can receive the position signal and send a first control command to the opening and closing valve.

[0008] According to one embodiment provided in this application, the two atomizing nozzles are divided into an upper nozzle and a lower nozzle, wherein the upper nozzle is inclined upward and the lower nozzle is inclined downward; When the atomizing spray gun rises, the controller sends a first control command to the opening and closing valve of the upper nozzle to control the upper nozzle to open; As the atomizing spray gun descends, the controller sends a first control command to the opening / closing valve of the lower nozzle to control the lower nozzle to open.

[0009] According to one embodiment of this application, the controller is also electrically connected to the robotic arm, and the controller is configured to execute the following control logic: The inner wall of the crucible is divided into a spherical bottom area, a cylindrical body area, and a mouth edge area; When the atomizing nozzle is in the bottom region of the sphere, the robotic arm is controlled to move at a second speed. When the atomizing nozzle is in the cylinder area, the robotic arm is controlled to slide at a first speed; When the atomizing nozzle is in the mouth edge region, the robotic arm is controlled to slide at a third speed; The first speed is greater than the second speed, and the second speed is greater than the third speed.

[0010] According to one embodiment of this application, the lower nozzle is further provided with a flow control valve, and the flow control valve is electrically connected to the controller; As the atomizing spray gun descends, the controller also sends a third control command to the flow control valve to reduce the flow rate of the lower nozzle, thereby reducing the downward deposition of the nano-mixed coating.

[0011] According to one embodiment provided in this application, the angle between the axis of the upper nozzle and the normal to the inner wall of the crucible, and the angle between the axis of the lower nozzle and the normal to the inner wall of the crucible, are both 30° to 45°.

[0012] According to one embodiment provided in this application, both the upper nozzle and the lower nozzle are fan-shaped atomizing nozzle structures, and the fan angle of the fan-shaped atomizing nozzle structure is 60° to 90°.

[0013] According to one embodiment provided in this application, the atomizing spray gun further includes: A feeding cylinder for storing nano-mixed coatings, with a mounting base at the bottom of the feeding cylinder connected to the actuator of the robotic arm; Both the upper nozzle and the lower nozzle can be detachably mounted at the bottom of the feed cylinder and communicate with the feed cylinder.

[0014] According to one embodiment of this application, the mounting base has a built-in heating module, which is sleeved on the outside of the feeding cylinder and used to heat the nano-mixed coating inside the feeding cylinder.

[0015] According to one embodiment provided in this application, it further includes: A spraying chamber, wherein the rotating support platform is rotatably mounted inside the spraying chamber, and the robotic arm is mounted on the top of the spraying chamber; An electric motor is located inside the spraying chamber and is used to drive the rotating support platform to rotate.

[0016] The present invention provides a crucible nano-hybrid coating spraying device. Compared with the prior art, by adding dual atomizing nozzles and cooperating with independent opening and closing control, the spraying quality of the spraying device in multiple thin-layer spraying scenarios is optimized. Specifically, the spraying device is equipped with two atomizing nozzles arranged in a centrally symmetrical, one above and one below tangential direction. The controller can control the two atomizing nozzles to open simultaneously, so that the dual atomizing nozzles can synchronously complete bidirectional coverage upward and downward. In mass production scenarios where multiple thin-layer sprayings are required on the inner wall of the crucible, the spraying rhythm of thin-layer spraying can be significantly improved.

[0017] In addition, the controller can independently control one of the atomizing nozzles to open, achieving alternating spraying: first, the robotic arm moves the atomizing spray gun from the bottom of the crucible upwards, opening the upward-facing atomizing nozzle; then, the robotic arm moves the atomizing spray gun downwards from the crucible opening, opening the downward-facing atomizing nozzle, repeating the above operation to spray alternately. Thus, the flow marks and thickness deviations left by spraying in the same direction can be covered and smoothed by the film layer sprayed in the opposite direction, avoiding uneven coating thickness or poor flatness that may be caused by a single nozzle, ensuring that the nano-hybrid coating is flat and has a uniform thickness.

[0018] Meanwhile, the two atomizing nozzles operate independently. If one nozzle becomes clogged, leaks, or malfunctions, the other atomizing nozzle can be used to complete the spraying operation independently without shutting down the entire machine, thus ensuring production continuity. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a crucible nano-mixed coating spraying device provided in an embodiment of the present invention; Figure 2 This is an embodiment of the present invention. Figure 1 Schematic diagram of the structure of a medium-atomizing spray gun; Figure 3 This is an embodiment of the present invention. Figure 1 Schematic diagram of the spray booth structure.

[0021] In the diagram: 1. Rotating support platform; 2. Robotic arm; 3. Atomizing spray gun; 301. Atomizing nozzle; 3011. Upper nozzle; 3012. Lower nozzle; 302. Feed cylinder; 303. Mounting base; 4. Spraying chamber. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0023] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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.

[0025] The terms "first," "second," "third," "fourth," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in a sequence other than those illustrated or described herein.

[0026] To make the drawings concise and easy to understand, some drawings only show one of the components with the same structure or function, or only one of them is marked. In this article, "one" not only means "only one", but can also mean "more than one", and "several" includes "two" and "more than two".

[0027] Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus. It is understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. The embodiments of this application are described in detail below with reference to the accompanying drawings.

[0028] The existing crucible inner wall spraying device is a structure with a rotating support and a single-nozzle robotic arm 2 for spraying. The core relies on the rotation of the crucible to achieve circumferential coverage and the robotic arm 2 to drive the spray gun to achieve axial coverage, thus completing the full-area spraying operation of the inner wall. However, this spraying device still has obvious shortcomings in multiple thin spraying operations: the atomizing spray gun 3 is a single nozzle design, with a long spraying path and long construction cycle. Moreover, unidirectional spraying is prone to flow marks and streaks in the coating, resulting in uneven thickness and poor flatness. At the same time, the single nozzle has no redundancy backup. Once it is blocked or malfunctions, it is necessary to stop the machine for maintenance, which affects the continuity of production.

[0029] To solve the above problems, such as Figures 1-3As shown, an embodiment of the present invention illustrates a crucible nano-mixed coating spraying device for spraying nano-mixed coating onto the inner wall of a crucible. The device includes a rotating support platform 1, a robotic arm 2, and an atomizing spray gun 3 equipped with two atomizing nozzles 301. Specifically, the rotating support platform 1 serves as the crucible's support and rotation drive component, supporting the crucible while simultaneously driving the crucible's vertical axis to rotate at a uniform speed. Its overall structure is a disc-shaped platform, consisting of a support surface, a positioning clamp, a rotating shaft, and a base (all components are shown in the illustration). The positioning clamp can be an arc-shaped claw / elastic limiting ring, bolted or integrally formed on the support surface, and the rotating shaft is fixedly connected below the support surface. The rotating shaft is rotatably connected to the base via bearings. The base can be a metal base, providing overall support and preventing tipping, ensuring the device operates without shaking.

[0030] The robotic arm 2 adopts a multi-degree-of-freedom industrial robotic arm structure. Its execution end can be rigidly fixed to the mounting base 303 at the bottom of the atomizing spray gun 3 through the flange, ensuring the stability of the atomizing spray gun 3 in the working position inside the crucible. The robotic arm 2 is a conventional device, so its structure and control principle are not described in detail.

[0031] The atomizing spray gun 3 has a one-piece structure, such as... Figure 2 As shown, the device includes a feeding cylinder 302, a mounting base 303, and two atomizing nozzles 301. Specifically, the feeding cylinder 302 is a vertical hollow cylinder. The mounting base 303 is fitted onto and integrally formed at the bottom of the feeding cylinder 302 and connected to the execution end of the robotic arm 2. The side of the mounting base 303 has a main air passage quick-connect interface for connecting to an external air supply pipe. The air supplied through the air supply pipe passes through the main air passage (isolated from the slurry flow channel inside the feeding cylinder 302) and is then guided by two branch air passages to the two atomizing nozzles 301. The two atomizing nozzles 301 are detachably installed at the bottom of the feeding cylinder 302 via connectors and are connected to the inside of the feeding cylinder 302. The two atomizing nozzles 301 are used for feeding... The cylinder 302 is arranged symmetrically around its vertical axis and is tangentially positioned along the crucible. One cylinder is inclined upwards and the other downwards, ensuring that the inclined direction does not impact the inner wall of the crucible perpendicularly. Each atomizing nozzle 301 has an on / off valve in its slurry flow channel. An electromagnetic needle-type on / off valve can be selected, which includes an electromagnetic drive assembly, a needle valve core, and a sealing seat. The needle valve core is sealed to the slurry flow channel of the nozzle, and the sealing seat is rigidly connected to the slurry flow channel of the atomizing nozzle 301, preventing slurry leakage. The electromagnetic drive assemblies of the two on / off valves are electrically connected to the controller, thereby controlling the start and stop of the spraying by the atomizing nozzle 301 by controlling the opening and closing of the needle valve core.

[0032] The controller can be a PLC controller, which can independently send a first control command to the opening and closing valve to control one of the atomizing nozzles 301 to open, or send a second control command to the opening and closing valve to control both atomizing nozzles 301 to open.

[0033] This embodiment provides a crucible nano-hybrid coating spraying device. By configuring dual atomizing nozzles 301 and matching them with independent opening and closing control, the dual atomizing nozzles 301 can simultaneously complete bidirectional coverage upwards and downwards. In mass production scenarios where multiple thin sprays are required on the inner wall of the crucible, this significantly improves the spraying rhythm of thin sprays. Furthermore, the controller can independently control the opening of a single nozzle, realizing alternating spraying operations: when the spray gun moves upwards from the bottom of the crucible, the upper nozzle 3011 is opened, and when it moves downwards from the opening, the lower nozzle 3012 is opened. This alternation is repeated, and the staggered coverage of the film layers by reverse spraying can effectively offset the flow marks and thickness deviations caused by unidirectional spraying, ensuring that the nano-hybrid coating is flat and has a uniform thickness. In addition, the dual atomizing nozzles 301 are independent working units. When one nozzle becomes blocked, drips, or malfunctions, the other nozzle can continue to complete the spraying operation without shutting down the entire machine, effectively ensuring the continuity of production operations.

[0034] Furthermore, the mounting base 303 has a built-in heating module. The heating module is sleeved on the outside of the feeding cylinder 302 and is used to heat the nano-mixed coating inside the feeding cylinder 302. It can adopt a ring heating coil structure and has a built-in temperature sensor to detect the heating temperature in real time and feed it back to the controller to achieve constant temperature control, thereby avoiding problems such as poor slurry fluidity, agglomeration and deposition.

[0035] In some embodiments, a position sensor is installed and electrically connected to the controller to achieve accurate detection of the height position of the atomizing nozzle 301 and linkage control of the nozzle opening and closing, providing core position signal support for alternating spraying of the dual nozzles; specifically, the robotic arm 2 drives the atomizing spray gun 3 to reciprocate up and down along the vertical axis of the feeding cylinder 302. The position sensor adopts a non-contact detection component (such as a laser displacement sensor) to achieve real-time detection of the crucible position. It is located at the top of the crucible and can be bolted to an external frame, just enough to avoid the position of the robotic arm 2. The position sensor is electrically connected to the controller, so that the controller can receive the position signal and send the first control command to the opening and closing valve to match the alternating spraying logic of the dual nozzles: "open the upper nozzle 3011 when moving upward and open the lower nozzle 3012 when moving downward".

[0036] Specifically, the two atomizing nozzles 301 are divided into an upper nozzle 3011 and a lower nozzle 3012. The upper nozzle 3011 is tilted upwards, and the lower nozzle 3012 is tilted downwards. The control logic is as follows: When the atomizing spray gun 3 initially moves upwards from the bottom of the crucible, the position sensor detects this position, i.e., the farthest distance, and the controller sends a first control command to the opening and closing valve of the upper nozzle 3011 to control the upper nozzle 3011 to open (the lower nozzle 3012 to close), realizing upward tangential spraying; when the atomizing spray gun 3 rises to the crucible opening and needs to move downwards from the crucible opening to complete the second thin spray, the position sensor detects this position, i.e., the closest distance, and the controller sends a first control command to the opening and closing valve of the lower nozzle 3012 to control the lower nozzle 3012 to open (the upper nozzle 3011 to close), realizing downward tangential spraying; the above operation is repeated to complete the alternating spraying.

[0037] This embodiment provides a crucible nano-mixed coating spraying device that realizes the linkage between the opening and closing of the atomizing nozzle 301 and the height of the atomizing spray gun 3. Real-time position detection ensures that the atomizing nozzle 301 opens and closes accurately at a preset height, avoiding uneven coating thickness and flow marks caused by the timing deviation of the dual nozzle switching.

[0038] As a further implementation, the inner wall of the crucible is divided into a spherical bottom area, a cylindrical body area, and an opening edge area along the height direction. Different heights are matched with different lifting speeds of the atomizing spray gun 3 to adapt to the structural properties of different areas and avoid coating defects. Specifically: the spherical bottom area has a large curvature, so a slower second speed should be used to ensure that the slurry fully covers every part of the spherical surface and prevent the bottom center from being too thick or the edges from being too thin; the cylindrical body area is a regular cylindrical curved surface, which is easy to spray, so a faster first speed can be used to improve spraying efficiency and ensure that the coating thickness in the cylindrical body area is uniform; the opening edge area is the transition section between the inner and outer walls of the crucible, which is prone to slurry overflow, edge accumulation, or missed spraying, so the slowest third speed is used to precisely control the spraying range and prevent slurry from being sprayed onto the outer wall.

[0039] Therefore, the controller is also electrically connected to the robotic arm 2. When the atomizing nozzle 301 is in the bottom area of ​​the sphere, the controller controls the robotic arm 2 to move at the second speed; when the atomizing nozzle 301 is in the cylinder area, the controller controls the robotic arm 2 to slide at the first speed; when the atomizing nozzle 301 is in the mouth edge area, the controller controls the robotic arm 2 to slide at the third speed. The first speed is greater than the second speed, the second speed is greater than the third speed, the first speed is 80-120 mm / s, preferably 100 mm / s; the second speed is 40-60 mm / s, preferably 50 mm / s; the third speed is 20-40 mm / s, preferably 30 mm / s.

[0040] In addition, for large-diameter crucibles, the speed values ​​can be appropriately reduced (e.g., the first speed can be reduced to 80-90 mm / s) to ensure the overlap rate of the sprayed coating; for small-diameter crucibles (<500 mm), the first speed can be increased (110-120 mm / s) to improve efficiency.

[0041] As a further implementation, the lower nozzle 3012 is also equipped with a flow control valve, which can be an electromagnetic proportional valve (which can be similar to the structure of an on / off valve, a conventional method, so it will not be elaborated on in detail), and is electrically connected to the controller. When the atomizing spray gun 3 descends, the controller also sends a third control command to the flow control valve to reduce the flow of the lower nozzle 3012. The reason is that the lower nozzle 3012 is tilted downwards, which is consistent with the direction of gravity. After the slurry is atomized, it will be easier to accumulate in the lower area than the upper nozzle 3011 (which sprays upwards, opposite to the direction of gravity) under the action of gravity, resulting in a thicker coating at the lower part of the spray path (near the bottom of the sphere). Therefore, the flow of the lower nozzle 3012 needs to be reduced to avoid the downward deposition of the nano-mixed coating.

[0042] As a specific embodiment, the angle between the axis of the upper nozzle 3011 and the normal of the inner wall of the crucible, and the angle between the axis of the lower nozzle 3012 and the normal of the inner wall of the crucible are both 30° to 45°. If the angle is less than 30°, it is easy to generate excessive tangential force, which can easily lead to lateral flow marks and slippage. If the angle is greater than 45°, it is close to direct impact, loses the leveling advantage, and the rebound is aggravated.

[0043] As a specific embodiment, both the upper nozzle 3011 and the lower nozzle 3012 are fan-shaped atomizing nozzle structures. The fan angle of the fan-shaped atomizing nozzle structure is 60° to 90°. Compared with a small fan angle, it can reduce the number of times the spray gun is raised and lowered, adapt to multi-pass thin spraying scenarios, and ensure uniform spraying.

[0044] As a specific embodiment, refer to Figure 3 It also includes a closed-cavity spraying chamber 4 for mounting a rotating support platform 1, which is installed on the inner bottom wall of the spraying chamber 4. Correspondingly, a robotic arm 2 is mounted on the inner top wall of the spraying chamber 4, and a motor is built in it to drive the rotating shaft to drive the rotating support platform 1 to rotate. The inner wall of the spraying chamber 4 can be treated with anti-corrosion and anti-adhesion (such as spraying a polytetrafluoroethylene coating) to facilitate the cleaning of nano-slurry splashed during the spraying process. The side of the cavity is equipped with an openable observation window and a maintenance door. The observation window is made of transparent explosion-proof glass to facilitate real-time monitoring of the spraying condition. The maintenance door is equipped with a sealing strip to ensure airtightness after closing.

[0045] Working principle: First, the crucible is fixed on the rotating support platform 1, and the motor drives the support platform to make the crucible rotate at a constant speed. Then, the robotic arm 2 drives the dual tangential atomizing spray gun 3 to extend into the crucible. The controller, combined with the height signal of the position sensor, controls the opening and closing valve of the nozzle: the upper nozzle 3011 is opened when rising and the lower nozzle 3012 is opened when descending, so as to achieve alternating spraying, or control the dual nozzles to open simultaneously to complete bidirectional coverage. In addition, for different areas of the crucible spherical bottom, cylinder body and mouth edge, the controller adjusts the robotic arm 2 to rise and fall at different speeds, and cooperates with the flow compensation of the flow control valve of the lower nozzle 3012 (reduce the flow when descending) to counteract the effects of gravity and curved surface. The whole process is completed in the closed spray chamber 4 to ensure safety and stability.

[0046] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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. Such 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 this application, and should all be included within the protection scope of this application.

Claims

1. A crucible nano-hybrid coating spraying device, used for spraying a nano-hybrid coating onto the inner wall of a crucible, characterized in that, include: Rotating support platform (1), the rotating support platform (1) is used to support and drive the crucible to rotate; A robotic arm (2) is provided with an atomizing spray gun (3) on its execution end. The robotic arm (2) can drive the atomizing spray gun (3) to extend into the crucible for inner wall spraying. The atomizing spray gun (3) includes two atomizing nozzles (301) that are centrally symmetrical and arranged tangentially to the crucible. One of the atomizing nozzles (301) is inclined upward and the other atomizing nozzle (301) is inclined downward. Each atomizing nozzle (301) is provided with an opening and closing valve, which is used to block the atomizing nozzle (301). The controller is electrically connected to both of the opening and closing valves. The controller is used to send a first control command to one of the atomizing nozzles (301) to control the corresponding atomizing nozzle (301) to open, and / or send a second control command to the other atomizing nozzle (301) to control the corresponding atomizing nozzle (301) to open, so that either of the atomizing nozzles (301) opens, or so that both atomizing nozzles (301) open simultaneously. The two atomizing nozzles (301) are divided into an upper nozzle (3011) and a lower nozzle (3012), with the upper nozzle (3011) tilted upward and the lower nozzle (3012) tilted downward. When the atomizing spray gun (3) rises, the controller sends a first control command to the opening and closing valve of the upper nozzle (3011) to control the upper nozzle (3011) to open; When the atomizing spray gun (3) descends, the controller sends a first control command to the opening and closing valve of the lower nozzle (3012) to control the lower nozzle (3012) to open.

2. The crucible nano-mixed coating spraying device according to claim 1, characterized in that, The robotic arm (2) is used to drive the atomizing spray gun (3) to reciprocate up and down, and also includes: A position sensor is used to detect the height position of the atomizing nozzle (301) and send a position signal to the controller. The controller can receive the position signal and send a first control command to the opening and closing valve.

3. The crucible nano-mixed coating spraying device according to claim 1, characterized in that, The controller is also electrically connected to the robotic arm (2), and the controller is configured to execute the following control logic: The inner wall of the crucible is divided into a spherical bottom area, a cylindrical body area, and a mouth edge area; When the atomizing nozzle (301) is in the bottom region of the sphere, the robotic arm (2) is controlled to move at a second speed; When the atomizing nozzle (301) is in the cylinder area, the robotic arm (2) is controlled to slide at a first speed; When the atomizing nozzle (301) is in the mouth edge region, the robotic arm (2) is controlled to slide at a third speed; The first speed is greater than the second speed, and the second speed is greater than the third speed.

4. The crucible nano-mixed coating spraying device according to claim 3, characterized in that, The lower nozzle (3012) is also equipped with a flow control valve, which is electrically connected to the controller; As the atomizing spray gun (3) descends, the controller also sends a third control command to the flow control valve to reduce the flow rate of the lower nozzle (3012) to reduce the downward deposition of the nano-mixed coating.

5. The crucible nano-mixed coating spraying device according to claim 3, characterized in that, The angle between the axis of the upper nozzle (3011) and the normal to the inner wall of the crucible, and the angle between the axis of the lower nozzle (3012) and the normal to the inner wall of the crucible, are both 30° to 45°.

6. The crucible nano-mixed coating spraying device according to claim 3, characterized in that, Both the upper nozzle (3011) and the lower nozzle (3012) are fan-shaped atomizing nozzle structures, and the fan angle of the fan-shaped atomizing nozzle structure is 60° to 90°.

7. The crucible nano-mixed coating spraying device according to claim 3, characterized in that, The atomizing spray gun (3) also includes: A feeding cylinder (302) is used to store nano-mixed coatings. A mounting base (303) is provided at the bottom of the feeding cylinder (302), and the mounting base (303) is connected to the execution end of the robotic arm (2). Both the upper nozzle (3011) and the lower nozzle (3012) can be detachably mounted at the bottom of the feed cylinder (302) and communicate with the feed cylinder (302).

8. The crucible nano-mixed coating spraying device according to claim 7, characterized in that, The mounting base (303) has a built-in heating module, which is sleeved on the outside of the feeding cylinder (302) and used to heat the nano-mixed coating inside the feeding cylinder (302).

9. The crucible nano-mixed coating spraying device according to claim 1, characterized in that, Also includes: Spraying chamber (4), the rotating support platform (1) is rotatably provided inside the spraying chamber (4), and the robotic arm (2) is provided on the top of the spraying chamber (4). The motor is located inside the spraying chamber (4) and is used to drive the rotating support platform (1) to rotate.

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