A spray system and its multi-stage vortex mixing device

Abstract

The utility model discloses a kind of spraying system and its multistage vortex mixing device, the device includes mixing chamber, vortex generating assembly and spiral flow guide component.Premixing section of mixing chamber is provided with air inlet and at least two powder feed ports, air inlet is set in the top wall of mixing chamber;Powder feed port is set in the side wall of mixing chamber, enough and corresponding component's powder feeder communication;Vortex generating assembly is set in premixing section, the central axis of its rotating shaft coincides with the central axis of mixing chamber, vortex generating assembly includes at least a pair of vortex blade, vortex blade is configured as adjustable inclination angle.Mixing chamber outlet section is configured to be able to communicate with spray gun, the cross-sectional area of outlet section is less than the cross-sectional area of premixing section;Mixing chamber mixes powder contraction section is conical, between premixing section and outlet section;Spiral flow guide component is set in powder contraction section, the central axis of its flow guide rotating shaft coincides with the central axis of mixing chamber, realizes the multistage sufficient mixing of multiple powders, improves the powder mixing effect of mixed powder.

Description

Technical Field

[0001] This utility model relates to the field of spraying technology, and in particular to a spraying system and its multi-stage vortex mixing device. Background Technology

[0002] The powder mixing device is a key piece of equipment in the spraying system that ensures uniform mixing and stable delivery of powder materials. Its performance directly affects the uniformity and performance of the coating.

[0003] Existing powder mixing devices have poor powder mixing performance and uneven powder mixing, making them unsuitable for use in high-end special equipment spraying scenarios. Utility Model Content

[0004] This invention provides a spraying system and its multi-stage vortex mixing device to achieve multi-stage thorough mixing of various powders and improve the powder mixing effect.

[0005] According to one aspect of the present invention, a multi-stage vortex mixing device is provided, the multi-stage vortex mixing device comprising a mixing chamber, a vortex generating component, and a spiral guiding component;

[0006] The mixing chamber includes a premixing section, a powder mixing shrinkage section, and an outlet section;

[0007] The premixing section is provided with an air inlet and at least two powder delivery ports. The air inlet is located on the top wall of the mixing chamber and is configured to receive airflow. The powder delivery ports are located on the side wall of the mixing chamber and are configured to communicate with powder feeders of corresponding components. The vortex generating assembly is located in the premixing section, with its rotation axis coinciding with the central axis of the mixing chamber. The vortex generating assembly includes at least one pair of vortex blades that are symmetrical about the central axis of the rotation axis, and the vortex blades are configured with adjustable tilt angles.

[0008] The outlet section is configured to communicate with the spray gun, and the cross-sectional area of ​​the outlet section is smaller than that of the premix section; the powder mixing shrinkage section is conical and located between the premix section and the outlet section; the spiral guide assembly is disposed in the powder mixing shrinkage section, and the central axis of its rotation axis coincides with the central axis of the mixing chamber.

[0009] Optionally, the two sides of the vortex blade have different curvatures.

[0010] Optionally, from the end connected to the premixing section to the end connected to the outlet section, the width of the spiral guide blades of the spiral guide assembly gradually increases with the increase of the cross-sectional area of ​​the powder mixing shrinkage section.

[0011] Optionally, the inclination angle of the spiral guide blades of the spiral guide assembly is between 30° and 40°.

[0012] Optionally, the multi-stage eddy mixing device also includes a pressure sensor and a powder discharge switch;

[0013] The pressure sensor is located in the powder mixing shrinkage section and is configured to collect powder quantity data in the powder mixing shrinkage section.

[0014] The powder outlet switch is located at the end of the outlet section and is connected to the pressure sensor. The powder outlet switch is configured to adjust the opening of the outlet section according to the powder quantity data.

[0015] Optionally, the pressure sensor includes a piezoelectric ceramic sensor.

[0016] Optionally, the aspect ratios at both ends of the powder-mixing shrinkage section are 2.5 and 3.5, respectively.

[0017] According to another aspect of the present invention, a spraying system is provided, the system comprising: at least two sets of powder feeders, spray guns, blower devices, controllers, and any of the multi-stage vortex mixing devices described in the first aspect;

[0018] The powder feeders of different components are respectively connected to different powder feeding ports of the multi-stage vortex mixing device;

[0019] The blower is located at the air inlet of the multi-stage vortex mixing device;

[0020] The spray gun is connected to the end of the outlet section of the multi-stage vortex mixing device;

[0021] The controller is connected to the powder feeder, the spray gun, and the blower, respectively.

[0022] Optionally, the spraying system may also include: a powder concentration sensor;

[0023] The powder concentration sensor is located in the outlet section;

[0024] The controller is also connected to the powder concentration sensor.

[0025] Optionally, the spraying system also includes a laser-induced breakdown spectrometer, which is located near the spray gun and configured to detect the compositional data of the powder sprayed from the spray gun;

[0026] The controller is also connected to the laser-induced breakdown spectrometer.

[0027] The spraying system and its multi-stage vortex mixing device provided by this utility model include a mixing chamber, a vortex generating component, and a spiral guiding component. The premixing section of the mixing chamber is provided with an air inlet and at least two powder feeding ports. The air inlet is located on the top wall of the mixing chamber; the powder feeding ports are located on the side wall of the mixing chamber and are connected to the powder feeders of the corresponding components. The vortex generating component is located in the premixing section, with its central axis of rotation coinciding with the central axis of the mixing chamber. The vortex generating component includes at least one pair of vortex blades, which are configured with adjustable tilt angles. The outlet section of the mixing chamber is configured to communicate with a spray gun, and the cross-sectional area of ​​the outlet section is smaller than that of the premixing section. The powder mixing contraction section of the mixing chamber is conical and located between the premixing section and the outlet section. The spiral guiding component is located in the powder mixing contraction section, with its central axis of rotation coinciding with the central axis of the mixing chamber, achieving multi-stage thorough mixing of multiple powders and improving the powder mixing effect.

[0028] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 A three-dimensional schematic diagram of a multi-stage eddy current mixing device provided for an embodiment of this utility model;

[0031] Figure 2 A perspective view of the mixing chamber of a multi-stage eddy current mixing device provided for an embodiment of this utility model;

[0032] Figure 3 A schematic diagram of the structure of an eddy current generating component provided in an embodiment of this utility model;

[0033] Figure 4 A schematic diagram illustrating the arrangement of the powder feeding port relative to the premixing section, provided for an embodiment of this utility model;

[0034] Figure 5 A perspective view of the mixing chamber of another multi-stage eddy current mixing device provided in an embodiment of this utility model;

[0035] Figure 6 This is a schematic diagram of the composition of a spraying system provided in an embodiment of the present utility model;

[0036] Figure 7 This is a schematic diagram of another spraying system provided in an embodiment of the present utility model;

[0037] Figure 8 This is a schematic diagram of another spraying system provided in an embodiment of the present utility model. Detailed Implementation

[0038] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0039] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model 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 the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0040] To address the problems in the background art, this utility model proposes a multi-stage eddy current mixing device. Figure 1 This is a three-dimensional schematic diagram of a multi-stage eddy current mixing device provided in an embodiment of the present invention. Figure 2 This is a perspective view of the mixing chamber of a multi-stage eddy current mixing device provided in an embodiment of the present invention. Figure 3 This is a schematic diagram of the structure of an eddy current generating component provided in an embodiment of the present utility model, combined with... Figure 1 , Figure 2 and Figure 3The multi-stage vortex mixing device 100 includes a mixing chamber 101, a vortex generating assembly 102, and a spiral guiding assembly 103. The mixing chamber 101 includes a premixing section 104, a powder mixing and shrinking section 105, and an outlet section 106. The premixing section 104 is provided with an air inlet 107 and at least two powder delivery ports 108. The air inlet 107 is located on the top wall of the mixing chamber 101 and is configured to receive airflow. The powder delivery ports 108 are located on the side wall of the mixing chamber 101 and are configured to communicate with powder feeders of corresponding components. The vortex generating assembly 102 is located in the premixing section 104, and its rotation axis coincides with the central axis of the mixing chamber 101. The vortex generating assembly 102 includes at least a pair of vortex blades 301 that are symmetrical about the rotation axis, and the vortex blades 301 are configured with adjustable tilt angles. The outlet section 106 is configured to communicate with the spray gun, and the cross-sectional area of ​​the outlet section 106 is smaller than that of the premix section 104. The powder mixing shrinkage section 105 is conical and located between the premix section 104 and the outlet section 106. The spiral guide assembly 103 is disposed in the powder mixing shrinkage section 105, and the central axis of its rotation axis coincides with the central axis of the mixing chamber 101.

[0041] Specifically, the mixing chamber 101 serves as a mixing chamber for at least two different powder components. The mixing chamber 101 can receive powders of different components through at least two powder inlets 108, and utilizes the vortex generator 102 and spiral guide assembly 103 disposed therein to perform mixing operations on the various powders. The premixing section 104 is a powder initial mixing section provided by the mixing chamber 101, and its height is higher than the powder shrinkage section 105 and the outlet section 106. The air inlet 107 is an opening for blowing air into the mixing chamber 101. The center of the air inlet 107 can be on the extended line of the central axis of the mixing chamber 101. For example, a blower can be provided at the air inlet 107 to achieve air circulation inside and outside the mixing chamber 101.

[0042] The powder inlet 108 is provided as a powder inlet, which can be connected to the mixing chamber 101 and the corresponding powder feeder via a pipeline, allowing the powder transported by the powder feeder to be received into the mixing chamber 101. Both the air inlet 107 and the powder inlet 108 are located in the premixing section 104. The air inlet 107 is located on the top surface of the premixing section 104, and the powder inlet 108 is located on the side wall of the premixing section 104. For example... Figure 4 This is a schematic diagram illustrating the arrangement of the powder feeding port relative to the premixing section according to an embodiment of the present invention. Figure 1 , Figure 2 , Figure 3 and Figure 4Multiple powder feeding ports 108 can be set at the same height on different sides of the premixing section 104. The powder feeding direction provided by the powder feeding ports 108 to the premixing section 104 can be tangential to the airflow rotation direction in the premixing section, facilitating the powder to enter the cavity with the airflow. The outlet section 106 is the mixed powder output section of the mixing chamber 101, and its cross-sectional area is smaller than that of the premixing section 104. The end of the outlet section 106 can be connected to a spray gun to deliver the mixed powder to the spray gun. The powder shrinkage section 105 is the powder shrinkage and concentration section of the mixing chamber 101, which is set between the premixing section 104 and the outlet section 106, and its height is lower than that of the premixing section 104 and higher than that of the outlet section 106. The powder shrinkage section 105 is tapered with a wider top and a narrower bottom, which can realize the concentrated processing of powder and facilitate the concentrated output of powder by the subsequent outlet section 106. For example, the cross-section of the powder shrinkage section 105 is circular.

[0043] The vortex generator assembly 102 is a swirling enhancement structure that generates a rotating airflow within the mixing chamber 101 through the rotation of the vortex blades 301 around a rotating axis, thereby mixing various powders. The rotating axis of the vortex generator can be referred to as the vortex rotating axis, and its central axis coincides with the central axis of the mixing chamber 101. The vortex generator assembly 102 is disposed in the premixing section 104 of the mixing chamber 101, and its height can at least partially coincide with or be slightly lower than the height of the powder inlet 108, so that the powder entering the mixing chamber 101 can be rotated and mixed by the vortex generator assembly 102 during the process of falling due to gravity and the airflow from the air inlet 107. The vortex blades 301 of the vortex generating assembly 102 are tilted at a preset angle relative to the height plane, so that the vortex generating assembly 102 can still rotate around its rotation axis with the airflow blown in by the air inlet 107 without the installation of a power motor. Here, the height plane refers to the plane perpendicular to the straight line where the central axis of the mixing chamber 101 is located, and the preset angle is the tilt angle of the vortex blades 301, which is adjustable. The vortex blades 301 and the rotation axis can be connected via a stroke-adjustable mechanical component to realize the adjustable tilt angle of the vortex blades 301. For example, each vortex blade 301 is equipped with an independent pitch bearing and servo motor between its root and the rotation axis.

[0044] The spiral guide assembly 103 is disposed in the powder mixing shrinkage section 105 and can drive the powder entering the powder mixing shrinkage section 105 downward. The spiral guide assembly 103 includes a rotating shaft and spiral-shaped guide vanes. The rotating shaft of the spiral guide assembly 103 can be referred to as the guide rotating shaft, and the central axis of the guide rotating shaft coincides with the central axis of the mixing chamber 101. The spiral-shaped guide vanes are fixedly installed around the guide rotating shaft. When the guide rotating shaft is rotated by a motor or by the flow of air, the guide rotating shaft will drive the spiral-shaped guide vanes to rotate. After the spiral vanes rotate, they will have a certain downward guiding effect on the material. For example, the guide rotating shaft of the spiral guide assembly 103 can be fixedly connected to the rotating shaft of the vortex generating assembly 102, so that when the vortex generating assembly 102 is rotated by the airflow, the spiral guide assembly 103 will also rotate, thereby guiding the powder downward.

[0045] The multi-stage vortex mixing device provided in this embodiment includes a mixing chamber, a vortex generating component, and a spiral guiding component. The premixing section of the mixing chamber is provided with an air inlet and at least two powder feeding ports. The air inlet is located on the top wall of the mixing chamber; the powder feeding ports are located on the side wall of the mixing chamber and are connected to the powder feeders of the corresponding components. The vortex generating component is located in the premixing section, with its central axis of rotation coinciding with the central axis of the mixing chamber. The vortex generating component includes at least one pair of vortex blades, which are configured with adjustable tilt angles. The outlet section of the mixing chamber is configured to communicate with a spray gun, and the cross-sectional area of ​​the outlet section is smaller than that of the premixing section. The powder mixing contraction section of the mixing chamber is conical and located between the premixing section and the outlet section. The spiral guiding component is located in the powder mixing contraction section, with its guiding rotation axis coinciding with the central axis of the mixing chamber. This achieves multi-stage thorough mixing of multiple powders, improving the powder mixing effect.

[0046] Optionally, based on the foregoing embodiments, further combinations are made... Figure 2 and Figure 3 The vortex generating assembly 102 includes two pairs of vortex blades 301, with a blade angle of 90° formed between the lines connecting the centroids of adjacent blades to the center of rotation. The two sides of the vortex blades 301 have different curvatures, thereby forming a double-curvature flow channel within the mixing cavity 101. The ratio of the two side curvature radii can be dynamically adjusted; for example, the ratio of curvature radii can be adjusted between 1.5 and 1.8.

[0047] Optionally, based on the foregoing embodiments, further combinations are made... Figure 2From the end connected to the premixing section 104 to the end connected to the outlet section 106, the width of the spiral guide blades of the spiral guide assembly 103 gradually widens as the cross-sectional area of ​​the powder mixing shrinkage section 105 increases, so that the size of the spiral guide blades matches the cavity size of the powder mixing shrinkage section 105. The inclination angle of the spiral guide blades in the spiral guide assembly 103 is between 30° and 40°. The length-to-diameter ratios at the two ends of the powder mixing shrinkage section 105 are 2.5 and 3.5, respectively.

[0048] Specifically, the edge of the spiral guide vane can be set in contact with the cavity wall of the powder mixing shrinkage section 105, so that the powder can fall as the spiral guide vane rotates, reducing the amount of adhesion in the gap between the spiral guide vane and the cavity wall, and improving the guiding effect.

[0049] The tilt angle of the guide vanes is set between 30° and 40°. This angle is moderately designed, large enough to allow the powder to flow downwards, and small enough to allow the powder flow speed to be controlled, thereby improving the controllability of the powder conveying speed of the multi-stage vortex mixer 100.

[0050] The aspect ratio of the powder mixing shrinkage section 105 at both ends is the ratio of the length of the powder mixing shrinkage section 105 to the diameter of the corresponding port. Numerically, the aspect ratio of the upper end of the powder mixing shrinkage section 105 is equal to the ratio between the length of the powder mixing shrinkage section 105 and the diameter of the cross-section of the premixing section 104, for example, equal to 2.5. The aspect ratio of the lower end of the powder mixing shrinkage section 105 is equal to the ratio between the length of the powder mixing shrinkage section 105 and the diameter of the cross-section of the outlet section 106, for example, equal to 3.5. This setting of the aspect ratio of the powder mixing shrinkage section 105 at both ends ensures that the length and inlet / outlet dimensions of the powder mixing shrinkage section 105 are appropriate, making the powder transmission smoother and reducing powder retention while ensuring controllable transmission speed.

[0051] Optionally, Figure 5 This is a perspective view of the mixing chamber of another multi-stage eddy current mixing device provided in an embodiment of the present invention. Based on the foregoing embodiments, refer to... Figure 5 The multi-stage eddy current mixing device 100 also includes a pressure sensor 401 and a powder discharge switch 402. The pressure sensor 401 is located in the powder mixing contraction section 105 and is configured to collect powder quantity data in the powder mixing contraction section 105. The powder discharge switch 402 is located at the end of the outlet section 106 and is connected to the pressure sensor 401. The powder discharge switch 402 is configured to adjust the opening of the outlet section 106 based on the powder quantity data.

[0052] Specifically, pressure sensor 401 is disposed in the powder mixing shrinkage section 105. By collecting pressure data from the powder mixing shrinkage section 105, the powder quantity data of the powder mixing shrinkage section 105 can be determined accordingly. The powder quantity data can be positively correlated with the pressure data. For example, pressure sensor 401 may include a piezoelectric ceramic sensor. Powder outlet switch 402 is disposed on outlet section 106 and can control the opening degree of outlet section 106, thereby controlling the amount of powder supplied. For example, powder outlet switch 402 may include a controllable valve. Powder outlet switch 402 is connected to pressure sensor 401, and its opening degree can be linked to the powder quantity data collected by pressure sensor 401. For example, the opening percentage of powder outlet switch 402 can be positively correlated with the powder quantity data collected by pressure sensor 401. The linkage between powder outlet switch 402 and pressure sensor 401 can reduce control response time and improve the powder supply sensitivity of multi-stage eddy current mixing device 100.

[0053] This utility model also provides a spraying system. Figure 6 This is a schematic diagram of the composition of a spraying system provided in an embodiment of the present utility model. Based on the foregoing embodiments, and in conjunction with... Figure 2 and Figure 6 The spraying system 500 includes at least two sets of powder feeders 501, spray guns 502, blowers 503, controllers 504, and the multi-stage vortex mixing device 100 described in the previous embodiment. Powder feeders 501 with different compositions are respectively connected to different powder inlets 108 of the multi-stage vortex mixing device 100. Blowers 503 are located at the air inlet 107 of the multi-stage vortex mixing device 100. Spray guns 502 are connected to the end of the outlet section 106 of the multi-stage vortex mixing device 100. The controller 504 is connected to the powder feeders 501, spray guns 502, and blowers 503.

[0054] Specifically, the powder feeder 501 is a material conveying functional component in the thermal spraying system 500. It is connected to the corresponding powder feeding port 108 on the multi-stage vortex mixing device 100 and is responsible for stably and uniformly conveying the powder material of the corresponding component in the corresponding powder storage bin to the multi-stage vortex mixing device 100 as needed. One multi-stage vortex mixing device 100 can correspond to at least two powder feeders 501 with different components to achieve the mixing of multi-component powders. For example, the powder feeder 501 can include at least one of gravity powder feeder, screw powder feeder, disc powder feeder, fluidized bed powder feeder, and vibrating powder feeder.

[0055] Spray gun 502 is a spraying functional component of spraying system 500. It is connected to the end of the outlet section 106 of multi-stage vortex mixing device 100 and is responsible for combining the spraying material in the mixed powder state processed by multi-stage vortex mixing device 100 with an energy source and spraying it at high speed onto the substrate surface to form a coating. For example, spray gun 502 may include a plasma spray gun and / or a high-speed oxygen fuel spray gun.

[0056] The blower 503 is a device that supplies air to the mixing chamber 101 of the multi-stage vortex mixing device 100 in the spraying system 500. It is located at the air inlet 107 of the mixing chamber 101 and can blow air from outside the mixing chamber 101 into the mixing chamber 101 through the air inlet 107 to form an airflow channel, thereby carrying more powder downwards.

[0057] The controller 504 is the control center of the spraying system 500. It is connected to the powder feeder 501, spray gun 502, blower 503, and sampling and controllable devices in the multi-stage vortex mixer. It can perform coordinated control of the powder feeder 501, spray gun 502, blower 503, and multi-stage vortex mixer to effectively control the powder transport speed. For example, the controller 504 may include a microcontroller. When the pressure sensor 401 detects excessive powder in the mixing chamber 101, the controller 504 can increase the opening of the powder discharge switch 402 on the outlet section 106 to increase the discharge of powder from the multi-stage vortex mixer. Simultaneously, the controller 504 can reduce the powder feeding power of each powder feeder 501 to reduce the powder input to the multi-stage vortex mixer. Conversely, when a significant amount of powder is detected stagnant on the inner wall of the mixing chamber 101, the controller 504 can increase the blower power of the blower 503 to increase the flow rate of the fluid within the chamber, causing the powder on the chamber wall to fall.

[0058] The spraying system provided in this embodiment includes at least two sets of powder feeders, spray guns, blowers, controllers, and the multi-stage vortex mixing device described in the previous embodiment. Powder feeders of different compositions are connected to different powder feeding ports of the multi-stage vortex mixing device. The blower is located at the air inlet of the multi-stage vortex mixing device. The spray gun is connected to the end of the outlet section of the multi-stage vortex mixing device. The controller is connected to the powder feeders, spray guns, and blowers, enabling coordinated control of the powder feeders, spray guns, blowers, and multi-stage vortex mixing device, significantly improving the transport efficiency and reliability of the powder material.

[0059] Optionally, Figure 7 This is a schematic diagram of another spraying system provided in an embodiment of the present invention. Based on the foregoing embodiments, and in conjunction with... Figure 2 and Figure 7The spraying system 500 also includes a powder concentration sensor 601. The powder concentration sensor 601 is located at the outlet section 106. The controller 504 is also connected to the powder concentration sensor 601.

[0060] Specifically, the powder concentration sensor 601 can detect the powder concentration at the outlet section 106 of the mixing chamber 101 in the multi-stage vortex mixer 100. For example, the powder concentration sensor 601 can be a microwave density sensor. The controller 504 is connected to the powder concentration sensor 601 and can control the upstream powder feeder 501, spray gun 502, blower 503, vortex generating component 102 and spiral guide component 103 in the multi-stage vortex mixer 100 according to the powder concentration at the outlet section 106. This achieves closed-loop feedback adjustment of the powder concentration fed by the spray gun 502, improving the accuracy of the powder supply.

[0061] Optionally, Figure 8 This is a schematic diagram of another spraying system provided in an embodiment of the present invention. Based on the foregoing embodiments, refer to... Figure 8 The spraying system 500 also includes a laser-induced breakdown spectrometer 701, which is located near the spray gun 502 and is configured to detect the composition data of the powder sprayed from the spray gun 502; the controller 504 is also connected to the laser-induced breakdown spectrometer 701.

[0062] Specifically, the laser-induced breakdown spectrometer 701 is an elemental analysis technique based on laser ablation and atomic emission spectroscopy. It generates plasma on the sample surface using high-energy laser pulses and analyzes the characteristic spectra emitted when the plasma cools, achieving rapid, non-destructive, and simultaneous multi-element detection. The laser-induced breakdown spectrometer 701 is positioned at the spray gun 502 and can detect the compositional data of the powder ejected from the spray gun 502. The controller 504 is also connected to the laser-induced breakdown spectrometer 701. The controller 504 can adjust the powder feeding efficiency of each powder feeder 501 based on the compositional data and using PID and fuzzy control strategies. For example, if the compositional data shows that the ratio of Al2O3 powder to NiCrAlY powder is relatively large compared to a preset ratio, the controller 504 can appropriately reduce the powder feeding power of the powder feeder 501 corresponding to Al2O3 powder and appropriately increase the powder feeding power of the powder feeder corresponding to NiCrAlY powder, thereby bringing the ratio of Al2O3 powder to NiCrAlY powder closer to the preset ratio. The laser-induced breakdown spectrometer 701 enables the analysis of the composition of the sprayed material, allowing for continuous adjustment of the proportion of various powder components, improving the accuracy of the powder supply ratio, and greatly optimizing the spraying effect of the spraying system 500.

[0063] The spraying system and its multi-stage vortex mixing device provided by this utility model include a mixing chamber, a vortex generating component, and a spiral guiding component. The premixing section of the mixing chamber is provided with an air inlet and at least two powder feeding ports. The air inlet is located on the top wall of the mixing chamber; the powder feeding ports are located on the side wall of the mixing chamber and are connected to the powder feeders of the corresponding components. The vortex generating component is located in the premixing section, with its central axis of rotation coinciding with the central axis of the mixing chamber. The vortex generating component includes at least one pair of vortex blades, which are configured with adjustable tilt angles. The outlet section of the mixing chamber is configured to communicate with a spray gun, and the cross-sectional area of ​​the outlet section is smaller than that of the premixing section. The powder mixing contraction section of the mixing chamber is conical and located between the premixing section and the outlet section. The spiral guiding component is located in the powder mixing contraction section, with its central axis of rotation coinciding with the central axis of the mixing chamber, achieving multi-stage thorough mixing of multiple powders and improving the powder mixing effect.

[0064] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A multi-stage eddy current mixing device, characterized in that, include: Mixing cavity, vortex generator assembly, and spiral guide assembly; The mixing chamber includes a premixing section, a powder mixing shrinkage section, and an outlet section; The premixing section is provided with an air inlet and at least two powder delivery ports. The air inlet is located on the top wall of the mixing chamber and is configured to receive airflow. The powder delivery ports are located on the side wall of the mixing chamber and are configured to communicate with powder feeders of corresponding components. The vortex generating assembly is located in the premixing section, with its rotation axis coinciding with the central axis of the mixing chamber. The vortex generating assembly includes at least one pair of vortex blades that are symmetrical about the central axis of the rotation axis, and the vortex blades are configured with adjustable tilt angles. The outlet section is configured to communicate with the spray gun, and the cross-sectional area of ​​the outlet section is smaller than that of the premix section; the powder mixing shrinkage section is conical and located between the premix section and the outlet section; the spiral guide assembly is disposed in the powder mixing shrinkage section, and the central axis of its rotation axis coincides with the central axis of the mixing chamber.

2. The multi-stage eddy current mixing device according to claim 1, characterized in that, The two sides of the vortex blade have different curvatures.

3. The multi-stage eddy current mixing device according to claim 1, characterized in that, From the end connected to the premixing section to the end connected to the outlet section, the width of the spiral guide blades of the spiral guide assembly gradually increases with the increase of the cross-sectional area of ​​the powder mixing shrinkage section.

4. The multi-stage eddy current mixing device according to claim 1, characterized in that, The spiral guide vanes of the spiral guide assembly have an inclination angle between 30° and 40°.

5. The multi-stage eddy current mixing device according to claim 1, characterized in that, Also includes: Pressure sensor and powder discharge switch; The pressure sensor is located in the powder mixing shrinkage section and is configured to collect powder quantity data in the powder mixing shrinkage section. The powder outlet switch is located at the end of the outlet section and is connected to the pressure sensor. The powder outlet switch is configured to adjust the opening of the outlet section according to the powder quantity data.

6. The multi-stage eddy current mixing device according to claim 5, characterized in that, The pressure sensor includes a piezoelectric ceramic sensor.

7. The multi-stage eddy current mixing device according to claim 1, characterized in that, The aspect ratios at both ends of the powder mixing shrinkage section are 2.5 and 3.5, respectively.

8. A spraying system, characterized in that, include: At least two sets of powder feeders, spray guns, blowers, controllers, and the multi-stage vortex mixing device as described in any one of claims 1-7; The powder feeders of different components are respectively connected to different powder feeding ports of the multi-stage vortex mixing device; The blower is located at the air inlet of the multi-stage vortex mixing device; The spray gun is connected to the end of the outlet section of the multi-stage vortex mixing device; The controller is connected to the powder feeder, the spray gun, and the blower, respectively.

9. The spraying system according to claim 8, characterized in that, Also includes: Powder concentration sensor; The powder concentration sensor is located in the outlet section; The controller is also connected to the powder concentration sensor.

10. The spraying system according to claim 8, characterized in that, It also includes: a laser-induced breakdown spectrometer, which is located near the spray gun and configured to detect the compositional data of the powder ejected from the spray gun; The controller is also connected to the laser-induced breakdown spectrometer.

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