Plasma ag spray apparatus having multiple acceleration passages

Abstract

This invention relates to the field of spraying equipment technology, specifically to a plasma AG spraying device with multi-stage acceleration channels; it includes: a plasma emitting module and a storage module, a sorting module, and a pneumatic discharge module sequentially and coaxially fixed at the emitting end of the plasma emitting module; the storage module has a first storage cavity and a second storage cavity capable of storing powders of different particle sizes; the sorting module has a sorting unit capable of sorting the powder and a driving unit capable of driving the powder to move and cooperate with the sorting unit for sorting; the pneumatic discharge module has a discharge pipe, a first conduction pipe and a second conduction pipe respectively connected to the first storage cavity and the second storage cavity, and a first pneumatic discharge nozzle and a second pneumatic discharge nozzle respectively connected to the discharge ends of the first conduction pipe and the second conduction pipe; this invention can perform graded accelerated conduction of powders of different particle sizes, resulting in uniform powder heating and good density.

Description

Technical Field

[0001] This invention relates to the field of spraying equipment technology, specifically to a plasma AG spraying equipment with multi-stage acceleration channels. Background Technology

[0002] Plasma spraying is a surface strengthening process that uses a high-temperature plasma jet to heat the coating material to a molten or semi-molten state and then sprays it at high speed onto the substrate surface to form a functional coating. Existing plasma AG spraying equipment typically transports and accelerates the plasma gas flow and coating particles through a single spray gun channel or a single-stage acceleration structure. In actual spraying, the coating particles must simultaneously undergo multiple processes such as powder feeding, heating, melting, and acceleration. However, due to differences in particle size distribution, the thermal and kinetic energy acquired by different particles within the single-stage acceleration channel often varies significantly. This leads to some particles not melting sufficiently and others overheating and evaporating, thus affecting the uniformity of the final coating structure and the deposition quality. Simultaneously, the large variation in airflow velocity gradient within the single-stage acceleration structure makes particles prone to deviating from the center of the main jet during high-speed transport, resulting in dispersed particle flight trajectories and reduced spraying deposition efficiency and material utilization.

[0003] Furthermore, as the requirements for density, bonding strength, and uniformity of high-performance coatings continue to increase, traditional spraying equipment is prone to problems such as uneven particle heating, jet energy attenuation, and discrete particle velocity distribution during long-distance or large-area continuous spraying. This results in large local thickness fluctuations, high porosity, and unstable interfacial bonding performance in the coating. Especially when spraying high-melting-point materials or composite powder materials, the difficulty in maintaining consistent heating and acceleration states for different particles further increases the probability of coating defects.

[0004] Meanwhile, most existing equipment adopts a fixed spray structure, which lacks the ability to control the plasma jet energy and particle motion state in stages. It is difficult to achieve gradient heating and step-by-step acceleration of particles according to different spraying materials and process requirements, resulting in poor adaptability of the spraying process and limiting the preparation quality and process stability of high-performance functional coatings. Summary of the Invention

[0005] To address the aforementioned issues, a plasma AG spraying device with multi-stage acceleration channels is provided. By proposing a spraying device capable of conducting powders of different particle sizes using multi-stage acceleration channels, the technical problems of uneven particle heating, poor jet stability, and insufficient coating density in existing plasma spraying devices are solved.

[0006] To address the problems of existing technologies, this invention provides a plasma AG spraying device with multi-stage acceleration channels, comprising: a plasma emitting module and a storage module, a sorting module, and a pneumatic discharge module sequentially and coaxially fixed at the emitting end of the plasma emitting module; the storage module has a first storage cavity and a second storage cavity capable of storing powders of different particle sizes; the sorting module has a sorting unit capable of sorting the powder and a driving unit capable of driving the powder to move and cooperate with the sorting unit for sorting; the pneumatic discharge module has a discharge pipe, a first conduction pipe and a second conduction pipe respectively connected to the first storage cavity and the second storage cavity, and a first pneumatic discharge nozzle and a second pneumatic discharge nozzle respectively connected to the discharge ends of the first conduction pipe and the second conduction pipe; wherein, the first pneumatic discharge nozzle is connected to the proximal end of the discharge pipe near the plasma emitting module, and the second pneumatic discharge nozzle is connected to the distal end of the discharge pipe, to form two powder acceleration channels of different lengths; powders of different particle size ranges are respectively introduced into the discharge pipe through the corresponding powder acceleration channels, thereby obtaining different heating strokes in the plasma flow.

[0007] Preferably, the storage module further includes a baffle and a storage bin; the storage bin is cone-shaped, and the first storage cavity and the second storage cavity are axially opened on the side wall of the storage bin along the axis of the storage bin; the baffle is coaxially covered outside the storage bin and forms a cone-shaped storage cavity for storing powder with the storage bin.

[0008] Preferably, the sorting unit further includes a first sorting bin and a second sorting bin arranged in a conical shape, and a first through hole and a second through hole respectively penetrating the first sorting bin and the second sorting bin; a plurality of first through holes and a plurality of second through holes are arranged in a one-to-one correspondence; the first through holes and the second through holes are both arranged to gradually expand from one end to the other end.

[0009] Preferably, the first sorting bin and the second sorting bin are arranged to rotate relative to each other; when the first sorting bin and the second sorting bin rotate, the overlap area between the first through hole and the second through hole can be changed to adjust the sorting gap of the powder.

[0010] Preferably, the driving unit is provided with multiple feeding strips and a driving ring capable of driving the multiple feeding strips to rotate synchronously; the multiple feeding strips are arranged at intervals along the circumference of the conical storage cavity and are all arranged in an inclined state; the driving ring is coaxially rotatably disposed outside the launching module and is fixedly connected to the multiple feeding strips.

[0011] Preferably, the pneumatic discharge module further includes two opening and closing rings capable of opening and closing the first transmission tube and the second transmission tube respectively; the opening and closing rings are rotatably disposed in the corresponding first pneumatic discharge nozzle and the second pneumatic discharge nozzle; the opening and closing rings are provided with a guide hole that can communicate with the corresponding transmission tube.

[0012] Preferably, a first acceleration channel and a second acceleration channel are formed in the first and second conduction tubes, respectively; the first acceleration channel is connected to the first pneumatic outlet nozzle; the second acceleration channel is connected to the second pneumatic outlet nozzle; and the length of the first acceleration channel is greater than the length of the second acceleration channel.

[0013] Preferably, the first storage chamber is used to store the sorted fine particulate powder; the second storage chamber is used to store the sorted coarse particulate powder; the fine particulate powder enters the first acceleration channel through the first conduction pipe; the coarse particulate powder enters the second acceleration channel through the second conduction pipe; so that powders of different particle sizes enter the spraying area through plasma acceleration channels of different lengths.

[0014] The advantages of this invention compared to the prior art are: 1. This invention sets up a sorting module and utilizes the adjustable sorting gap formed between the first and second sorting chambers to classify the spraying powder online, so that powders of different particle sizes can enter the corresponding storage chambers for classified storage. This avoids the problems of uneven heating and large differences in melting state caused by the mixed conveying of powders of different particle sizes in traditional spraying equipment, thereby improving the consistency of the sprayed particle state and the stability of the final coating quality.

[0015] 2. This invention places a first pneumatic outlet nozzle at the end of the outlet tube furthest from the plasma emission module and a second pneumatic outlet nozzle at the end of the outlet tube closest to the plasma emission module. This allows powders of different particle sizes to enter plasma acceleration channels of different lengths, thereby obtaining different plasma heating strokes. Coarse powder particles achieve a longer heating and acceleration distance, while fine powder particles achieve a relatively shorter heating distance. This achieves a corresponding match between different particle sizes and the heating path, reducing over-burning, evaporation, and oxidation of fine powders, while avoiding insufficient melting of coarse powder particles.

[0016] 3. This invention, through the coordinated operation of a conical storage chamber, a gradually expanding sorting through-hole, and a feeding bar, enables the powder to be conveyed, dispersed, and graded simultaneously during the continuous conveying process from the narrow end to the wide end. This not only improves the continuity and stability of the powder sorting process, but also allows for adjustment of the sorting gap according to different spraying process requirements, enabling rapid switching and precise supply of powders of different particle sizes, and improving the equipment's adaptability and adjustment capabilities to various spraying materials. Attached Figure Description

[0017] Figure 1 This is a three-dimensional diagram of a plasma AG spraying equipment with multi-stage acceleration channels.

[0018] Figure 2 A side view of a plasma AG spraying equipment with multi-stage acceleration channels. Figure 1 .

[0019] Figure 3 yes Figure 2 Sectional view at point AA.

[0020] Figure 4 yes Figure 3 A magnified view of section B.

[0021] Figure 5 yes Figure 3 A magnified view of a portion of point C.

[0022] Figure 6 This is an exploded perspective view of the plasma emission module in a plasma AG spraying equipment with multi-stage acceleration channels.

[0023] Figure 7 A side view of a plasma AG spraying equipment with multi-stage acceleration channels. Figure 2 .

[0024] Figure 8 yes Figure 7 A three-dimensional sectional view of the section at DD.

[0025] The numbers on the map are: 1. Plasma emission module; 2. Material storage module; 21. First storage cavity; 22. Second storage cavity; 23. Material baffle; 24. Material storage bin; 3. Sorting module; 31. Sorting unit; 311. First sorting bin; 312. Second sorting bin; 313. First through hole; 314. Second through hole; 32. Drive unit; 321. Feed bar; 322. Drive ring; 323. Drive cover; 324. Air source inlet; 4. Pneumatic discharge module; 41. Discharge pipe; 42. First transmission pipe; 43. Second transmission pipe; 44. First pneumatic discharge nozzle; 45. Second pneumatic discharge nozzle; 46. Opening and closing loop; 47. Material guide hole. Detailed Implementation

[0026] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0027] See Figures 1 to 8As shown: A plasma AG spraying device with multi-stage acceleration channels, characterized in that it includes: a plasma emitting module 1 and a storage module 2, a sorting module 3, and a pneumatic discharge module 4, which are sequentially and coaxially fixed at the emitting end of the plasma emitting module 1; the storage module 2 is provided with a first storage cavity 21 and a second storage cavity 22 for storing powders of different particle sizes; the sorting module 3 is provided with a sorting unit 31 for sorting the powder and a driving unit 32 for driving the powder to move and cooperating with the sorting unit 31 for sorting; the pneumatic discharge module 4 is provided with a discharge pipe 41, which is connected to the first storage module 21 and the second storage cavity 22. The cavity 21 and the second storage cavity 22 are connected by a first conductive tube 42 and a second conductive tube 43, and by a first pneumatic outlet nozzle 44 and a second pneumatic outlet nozzle 45 respectively connected to the outlet ends of the first conductive tube 42 and the second conductive tube 43; wherein, the first pneumatic outlet nozzle 44 is connected to the proximal end of the outlet tube 41 near the plasma emission module 1, and the second pneumatic outlet nozzle 45 is connected to the distal end of the outlet tube 41, so as to form two powder acceleration channels of different lengths; powders of different particle size ranges are introduced into the outlet tube 41 through the corresponding powder acceleration channels, thereby obtaining different heating strokes in the plasma flow.

[0028] When plasma AG spraying is required, the powder to be sprayed is first introduced into the storage module 2, and the powder of different particle sizes is pre-classified by the sorting module 3. The classified powders are stored in the first storage cavity 21 and the second storage cavity 22 respectively. Then, the pneumatic discharge module 4 is activated, and the powders of different particle sizes are transported to the corresponding first pneumatic discharge nozzle 44 and second pneumatic discharge nozzle 45 through the first conduction pipe 42 and the second conduction pipe 43 respectively. The first pneumatic discharge nozzle 44 is connected to the end of the discharge pipe 41 away from the plasma emission module 1, and the second pneumatic discharge nozzle 45 is connected to the end of the discharge pipe 41 close to the plasma emission module 1. Therefore, the plasma flow path length experienced by powders of different particle sizes after entering the discharge pipe 41 is different, thus forming multiple powder acceleration channels of different lengths. The powder is continuously heated and accelerated by the high-speed plasma airflow in the corresponding acceleration channel, so that powders of different particle sizes can obtain a heating stroke that matches their own melting requirements, avoiding burn-off of fine powder due to overheating, and avoiding insufficient melting of coarse powder due to insufficient heating.

[0029] By constructing multiple powder acceleration channels of different lengths, differentiated heating and acceleration of powders with different particle sizes can be achieved, thereby improving the melting consistency of sprayed particles and the coating quality.

[0030] See Figure 6As shown: The storage module 2 further includes a baffle 23 and a storage bin 24; the storage bin 24 is cone-shaped, and the first storage cavity 21 and the second storage cavity 22 are axially opened on the side wall of the storage bin 24 along the axis of the storage bin 24; the baffle 23 is coaxially covered outside the storage bin 24 and forms a cone-shaped storage cavity for storing powder with the storage bin 24.

[0031] The storage bin 24 adopts a conical structure design, and the baffle 23 is coaxially mounted on the outside of the storage bin 24, forming a conical storage cavity. When the powder is introduced by the external feeding device, the powder first accumulates in the narrow end area of ​​the conical storage cavity. Since the conical storage cavity gradually expands along the axial direction, a conveying path that gradually expands from the narrow end to the wide end can be formed during the subsequent material conveying process, thereby reducing the phenomenon of local accumulation of powder. At the same time, the first storage cavity 21 and the second storage cavity 22 are directly opened on the side wall of the storage bin 24, so that the sorted powder can fall directly into the corresponding storage area for classified storage, providing a storage basis for the subsequent formation of acceleration channels of different lengths.

[0032] The narrow end of the baffle 23 is also radially fixed with an inlet ring 25 that can guide the powder into the conical storage cavity.

[0033] See Figure 4 and Figure 6 As shown: The sorting unit 31 further includes a first sorting bin 311 and a second sorting bin 312 arranged in a conical shape, and a first through hole 313 and a second through hole 314 respectively opened through the first sorting bin 311 and the second sorting bin 312; a plurality of first through holes 313 and a plurality of second through holes 314 are arranged in a one-to-one correspondence; the first through holes 313 and the second through holes 314 are both arranged to gradually expand from one end to the other end.

[0034] The narrow ends of the first through hole 313 and the second through hole 314 are located close to the narrow end of the first sorting chamber 311, and the wide ends are located close to the wide end of the first sorting chamber 311.

[0035] When the powder is conveyed from the narrow end to the wide end along the conical storage cavity under the action of the drive unit 32, the powder sequentially passes through the sorting area formed between the first sorting bin 311 and the second sorting bin 312. Since both the first through hole 313 and the second through hole 314 adopt a gradually expanding structure, only powder with a smaller particle size is allowed to pass through near the narrow end area. As the conveying distance increases, the through hole size gradually increases, and powder with a larger particle size can also gradually pass through the corresponding through hole. This forms a sorting interval that changes step by step along the conveying direction, realizing the continuous grading of powder with different particle sizes.

[0036] See Figure 4 and Figure 6 As shown: the first sorting bin 311 and the second sorting bin 312 are arranged to rotate relative to each other; when the first sorting bin 311 and the second sorting bin 312 rotate, they can change the overlap area between the first through hole 313 and the second through hole 314, so as to adjust the sorting gap of the powder.

[0037] When different specifications of spray powder need to be accommodated, the first sorting chamber 311 can be driven to rotate relative to the second sorting chamber 312. As they rotate relative to each other, the overlap area between the first through hole 313 and the second through hole 314 changes, thereby altering the actual sorting aperture. By adjusting the overlap area, the powder passage conditions can be quickly changed, enabling the equipment to adapt to the sorting requirements of powders of different mesh sizes without replacing the sorting components. The sorted powders still enter the corresponding first storage chamber 21 or second storage chamber 22, providing a particle size basis for subsequent conveying through different acceleration channels.

[0038] See Figure 6 and Figure 8 As shown: The drive unit 32 is provided with a plurality of feeding strips 321 and a drive ring 322 capable of driving the plurality of feeding strips 321 to rotate synchronously; the plurality of feeding strips 321 are arranged at intervals along the circumference of the conical storage cavity and are all arranged in an inclined state; the drive ring 322 is coaxially rotatably disposed outside the launching module and is fixedly connected to the plurality of feeding strips 321.

[0039] The drive unit 32 also includes a drive cover 323 coaxially disposed outside the drive ring 322 and an air source inlet 324 that can tilt toward the drive cover 323 to input a drive air source.

[0040] After the powder enters the conical storage chamber, the driving air source enters the drive cover 323 through the air source inlet 324, and drives the drive ring 322 to rotate around the axis of the plasma emission module 1. The drive ring 322 drives multiple inclined feeding strips 321 to rotate synchronously. During the rotation, the feeding strips 321 continuously push the powder along the conical storage chamber from the narrow end to the wide end. Because the feeding strips 321 are inclined, they can generate not only axial conveying force but also circumferential disturbance force, keeping the powder in a dispersed state during the conveying process, increasing the contact probability between the powder and the sorting through-holes, thereby improving the overall sorting efficiency.

[0041] Furthermore, to further improve the sorting accuracy of powders of different particle sizes, during the sorting process, multiple feed bars 321 first drive the powder to move along the first sorting area at a first rotational speed. Because the first sorting area corresponds to a small overlap between the first through-hole 313 and the second through-hole 314, smaller fine powders can preferentially pass through the corresponding sorting gap and enter the corresponding storage cavity, while larger powders remain in the conical storage cavity. After the fine powder completes the initial sorting, the multiple feed bars 321 then drive the remaining powder along the second sorting area at a second rotational speed, causing the powder to gradually enter the corresponding larger sorting gap area. At this time, larger coarse powders can pass through the corresponding sorting gap and enter the corresponding storage cavity, thereby achieving the separation of coarse and fine powders. By controlling the movement state of the powder in different sorting areas in stages, the mutual interference caused by powders of different particle sizes passing through the sorting gap simultaneously can be reduced, improving the stability of powder particle size classification.

[0042] See Figure 5 As shown: The pneumatic discharge module 4 further includes two opening and closing rings 46 that can control the opening and closing of the first transmission tube 42 and the second transmission tube 43 respectively; the opening and closing rings 46 are rotatably disposed in the corresponding first pneumatic discharge nozzle 44 and second pneumatic discharge nozzle 45; the opening and closing rings 46 are provided with guide holes 47 that can communicate with the corresponding transmission tubes.

[0043] When a specific particle size powder needs to be selected for spraying, simply rotate the opening and closing ring 46 inside the corresponding pneumatic outlet nozzle. When the guide hole 47 on the opening and closing ring 46 is connected to the corresponding transmission pipe, the powder in the corresponding storage chamber can enter the outlet pipe 41 under the action of airflow; when the guide hole 47 is misaligned with the transmission pipe, the conveying path is cut off. By independently controlling different opening and closing rings 46, different particle size powders can be sprayed individually, mixed, or sprayed in different modes.

[0044] See Figure 3 and Figure 5 As shown: A first acceleration channel and a second acceleration channel are respectively formed in the first conduction tube 42 and the second conduction tube 43; the first acceleration channel is connected to the first pneumatic outlet nozzle 44; the second acceleration channel is connected to the second pneumatic outlet nozzle 45; the length of the first acceleration channel is greater than the length of the second acceleration channel.

[0045] Since the first pneumatic outlet nozzle 44 is connected to the distal end of the outlet tube 41, and the second pneumatic outlet nozzle 45 is connected to the proximal end of the outlet tube 41, a first acceleration channel and a second acceleration channel of different lengths are formed inside the first outlet tube 41 and the second outlet tube 41, respectively. When the powder enters the outlet tube 41, it will complete the heating, acceleration, and melting process under the action of the plasma flow. The length of the first acceleration channel is greater than the length of the second acceleration channel. Therefore, the powder entering the second acceleration channel can obtain a longer plasma action time, while the powder entering the first acceleration channel obtains a relatively shorter action time, thereby achieving differentiated heating for different powders.

[0046] See Figure 3 and Figure 5 As shown: the first storage chamber 21 is used to store the sorted fine particulate powder; the second storage chamber 22 is used to store the sorted coarse particulate powder; the fine particulate powder enters the first acceleration channel through the first conduction pipe 42; the coarse particulate powder enters the second acceleration channel through the second conduction pipe 43; so that powders of different particle sizes enter the spraying area through plasma acceleration channels of different lengths.

[0047] After sorting, the fine powder particles first enter the first storage chamber 21 and then enter the first acceleration channel via the first conduction pipe 42. Because the fine powder particles are small in size and heat up quickly, the risk of localized oxidation or burn-off caused by prolonged high-temperature exposure is reduced within the longer acceleration channel. Simultaneously, the coarse powder particles enter the second storage chamber 22 and then enter the second acceleration channel via the second conduction pipe 43. Due to their larger mass and stronger inertia, the coarse powder particles enter closer to the spraying area, achieving a stable and uniform plasma heating effect. By using plasma acceleration channels of different lengths corresponding to different particle sizes, the sprayed particles can all reach a relatively ideal molten state before reaching the workpiece surface.

[0048] This invention can classify powders of different particle sizes to accelerate heat conduction, resulting in uniform heating and good density of the powders.

[0049] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A plasma AG spraying equipment with multi-stage acceleration channels, characterized in that, include: A plasma emission module and a material storage module, a sorting module, and a pneumatic discharge module are sequentially and coaxially fixed at the emission end of the plasma emission module. The storage module is equipped with a first storage chamber and a second storage chamber capable of storing powders of different particle sizes; The sorting module is equipped with a sorting unit capable of sorting powder and a drive unit capable of driving the powder to move and cooperating with the sorting unit to perform sorting. The pneumatic export module is provided with an export tube, a first conduction tube and a second conduction tube that are respectively connected to the first storage cavity and the second storage cavity, and a first pneumatic export nozzle and a second pneumatic export nozzle that are respectively connected to the export ends of the first conduction tube and the second conduction tube. The first pneumatic outlet nozzle is connected to the proximal end of the outlet tube near the plasma emission module, and the second pneumatic outlet nozzle is connected to the distal end of the outlet tube to form two powder acceleration channels of different lengths. Powders of different particle size ranges are introduced into the discharge pipe through corresponding powder acceleration channels, thereby obtaining different heating strokes in the plasma flow.

2. The plasma AG spraying equipment with multi-stage acceleration channels according to claim 1, characterized in that, The material storage module also includes a baffle and a material storage bin; The storage bin is cone-shaped, and the first storage cavity and the second storage cavity are axially opened on the side wall of the storage bin along the axis of the storage bin; The baffle is coaxially mounted outside the storage bin and together with the storage bin forms a conical storage cavity for storing powder.

3. The plasma AG spraying equipment with multi-stage acceleration channels according to claim 2, characterized in that, The sorting unit further includes a first sorting bin and a second sorting bin arranged in a conical shape, and a first through hole and a second through hole respectively penetrating the first sorting bin and the second sorting bin; Each of the first through holes and the second through holes is provided in a one-to-one correspondence. Both the first through hole and the second through hole are gradually widened from one end to the other.

4. The plasma AG spraying equipment with multi-stage acceleration channels according to claim 3, characterized in that, The first sorting bin and the second sorting bin are arranged to rotate relative to each other; When the first sorting bin and the second sorting bin rotate, they can change the overlap area between the first through hole and the second through hole, thereby adjusting the sorting gap of the powder.

5. A plasma AG spraying equipment with multi-stage acceleration channels according to claim 2, characterized in that, The drive unit is provided with multiple feeding bars and a drive ring capable of driving the multiple feeding bars to rotate synchronously; Multiple feeding strips are arranged at intervals along the circumference of the conical storage cavity, and all of the feeding strips are arranged in an inclined state. The drive ring is coaxially rotatably disposed outside the launching module and is fixedly connected to multiple feeding strips.

6. The plasma AG spraying equipment with multi-stage acceleration channels according to claim 1, characterized in that, The pneumatic output module also includes two opening and closing loops that can respectively control the opening and closing of the first conductive tube and the second conductive tube; The opening and closing ring is rotatably disposed within the corresponding first pneumatic outlet nozzle and second pneumatic outlet nozzle; The opening and closing ring is provided with a material guide hole that can communicate with the corresponding transmission pipe.

7. The plasma AG spraying equipment with multi-stage acceleration channels according to claim 1, characterized in that, A first acceleration channel and a second acceleration channel are respectively formed inside the first and second conduction tubes. The first acceleration channel is connected to the first pneumatic outlet nozzle; The second acceleration channel is connected to the second pneumatic outlet nozzle; The length of the first acceleration channel is greater than the length of the second acceleration channel.

8. A plasma AG spraying equipment with multi-stage acceleration channels according to claim 7, characterized in that, The first storage cavity is used to store the sorted fine particulate powder; The second storage chamber is used to store the sorted coarse powder particles; The fine powder particles enter the first acceleration channel via the first conduction tube; The coarse powder enters the second acceleration channel via the second conduction pipe; This allows powders of different particle sizes to enter the spraying area through plasma acceleration channels of different lengths.

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