A plasma spraying device with an anti-clogging structure

Abstract

The present invention relates to the technical field of plasma spraying, and specifically relates to a plasma spraying device with an anti-blocking structure, which includes a spraying device main body and a spraying nozzle. The spraying nozzle includes a nozzle main body, a cathode electrode, a primary feeding seat, a rotating feeding seat, a feeding nozzle, and an anode electrode. An installation cavity and an air supply cavity are provided on the nozzle main body. An air intake channel is provided at the edge of the installation cavity, and the air intake channel is connected to a plasma gas supply device through an air supply pipeline. The cathode electrode is installed in the installation cavity and is connected to the negative pole of the power supply. The primary feeding seat is arranged in a ring shape; by setting the spraying nozzle on the plasma spraying device to be composed of a nozzle main body, a cathode electrode, a primary feeding seat, a rotating feeding seat, a feeding nozzle, and an anode electrode, and rotatably installing the rotating feeding seat on the nozzle main body, the feeding nozzle can perform rotating feeding, so that the nozzle main body can spray more evenly.

Description

Technical Field

[0001] The present invention relates to the technical field of plasma spraying, and specifically provides a plasma spraying device with an anti-blocking structure. Background Technique

[0002] Plasma spraying is a technology for surface strengthening and surface modification of materials, which can endow the surface of the substrate with properties such as wear resistance, corrosion resistance, high-temperature oxidation resistance, electrical insulation, heat insulation, radiation protection, friction reduction, and sealing. Plasma spraying technology uses a plasma arc driven by direct current as a heat source to heat materials such as ceramics, alloys, and metals to a molten or semi-molten state, and spray them onto the surface of the pre-treated workpiece at high speed to form a firmly attached surface layer.

[0003] The existing Chinese patent document with the publication number CN218372472U discloses a spray gun for plasma spraying. The solution includes a spray gun body. One end of the spray gun body is provided with a nozzle structure. The nozzle structure includes a fixed block fixedly connected to one end of the spray gun body and a movable block clamped to the fixed block. Both the fixed block and the movable block include an inner shell provided with a spray hole, a heating layer fixedly connected to the outer surface of the inner shell, an isolation layer fixedly connected to the outer surface of the heating layer, and a heat preservation layer fixedly connected to the isolation layer. Both ends of the middle part of the heat preservation layer are provided with grooves. The middle parts of the axial ends of the heat preservation layer of the fixed block are both provided with clamping blocks, and the middle parts of the axial ends of the heat preservation layer of the movable block are both provided with clamping grooves adapted to the clamping blocks; One end of the spray gun body is threadedly connected with a sealing sleeve through a screw rod. The sealing sleeve is adapted to the nozzle structure. A gas distribution disc is fixedly connected to the inner cavity of the other end of the spray gun body, and a gas inlet pipe is fixedly connected to the middle part of the other end of the gas distribution disc.

[0004] However, the spray gun structure in the above solution is relatively simple, and its powder material is prone to form a bonding problem on the side wall of the part with a smaller nozzle aperture, resulting in a nozzle blockage problem when the spray gun is actually used, thus affecting the production and processing efficiency during maintenance. Therefore, the present invention proposes a plasma spraying device with an anti-blocking structure to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a plasma spraying device with an anti-blocking structure to solve the problems raised in the above background technique.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A plasma spraying device with an anti-blocking structure includes a spraying device main body and a spraying nozzle. The spraying nozzle includes:

[0007] A spray head body, an installation cavity and an air supply cavity are formed on the spray head body, an air inlet channel is arranged at the edge of the installation cavity, and the air inlet channel is connected with a plasma gas supply device through an air supply pipeline;

[0008] A cathode electrode, the cathode electrode is installed in the installation cavity, and the cathode electrode is connected with the negative pole of the power supply;

[0009] A primary feeding seat, the primary feeding seat is arranged in a ring shape, and the primary feeding seat is installed on the spray head body. A primary feeding cavity is formed on the primary feeding seat. A primary guiding hole is arranged at the front side end of the primary feeding cavity. A powder feeding port is arranged at the rear side end of the primary guiding hole, and the powder feeding port is connected with a powder supply device through a powder pipeline;

[0010] A rotary feeding seat, the rotary feeding seat is rotatably installed on the spray head body. A secondary feeding cavity is formed on the rotary feeding seat. A middle air hole and an edge guiding hole are arranged at the front side end of the secondary feeding cavity, and the middle air hole is arranged in alignment with the air supply cavity;

[0011] A feeding spray head, the feeding spray head is connected with the front side end of the spray head body through a connecting flange, and the feeding end of the feeding spray head is arranged in alignment with the edge guiding hole;

[0012] An anode electrode, the anode electrode is fixed on the rear end face of the spray head body.

[0013] Preferably, the rear side end of the installation cavity is open, and a threaded groove is arranged at the rear side port of the installation cavity. A rear cover plate is screwed and installed in the threaded groove. The cathode electrode is positioned in the installation cavity through the rear cover plate. A threaded hole is formed on the spray head body. Connecting ear plates are integrally formed at the front and rear ends of the primary feeding seat. An installation hole is arranged on the connecting ear plate, and the installation hole corresponds to the threaded hole, and the connecting ear plate is fixed on the spray head body through a positioning screw.

[0014] Preferably, a primary bearing groove is formed at the front side end of the spray head body, a secondary bearing groove is formed at the front side end of the primary feeding seat, a tertiary bearing groove is formed at the rear side end of the rotary feeding seat, a quaternary bearing groove is formed at the rear side port of the middle air hole, the secondary bearing groove and the tertiary bearing groove are arranged in correspondence with each other, and a primary sealing bearing is arranged between the secondary bearing groove and the tertiary bearing groove. The primary bearing groove and the quaternary bearing groove are arranged in correspondence with each other, and a secondary sealing bearing is arranged between the primary bearing groove and the quaternary bearing groove. The rotary feeding seat is rotationally connected through the primary sealing bearing and the secondary sealing bearing.

[0015] Preferably, five feeding nozzles and anode electrodes are arranged equidistantly around the nozzle body. The anode electrodes are all connected to the positive pole of the power supply, and the anode electrodes and the feeding nozzles are arranged in a staggered manner. The ports of the feeding nozzles are arranged towards the center position of the nozzle body, and the feeding nozzles and the anode electrodes are arranged in a one-to-one correspondence.

[0016] Preferably, a circle of first-stage guiding holes is arranged equidistantly. The first-stage guiding holes are arranged in a flared shape, and the rear ends of adjacent first-stage guiding holes are connected. The edge guiding holes are arranged in the same way as the first-stage guiding holes.

[0017] Preferably, an annular gear is fixedly installed on the outer side wall of the rotary feeding seat. A motor bracket is fixedly installed on the rear side wall of the nozzle body. A reduction motor is fixedly installed on the motor bracket. A transmission gear is fixedly installed on the output shaft of the reduction motor. The transmission gear is meshed with the annular gear.

[0018] Preferably, the feeding nozzle is composed of a nozzle body and a nozzle. The nozzle body and the nozzle are connected by welding. A threaded seat and a lock prevention seat are integrally formed on the side wall at the root of the nozzle. A steel ball storage cover is screwed on the threaded seat. A steel ball groove is formed by enclosing between the steel ball storage cover and the outer side wall of the nozzle. Steel balls are movably arranged in the steel ball groove. The gravity value of the steel balls is greater than the centrifugal force generated by the steel balls when the rotary feeding seat rotates.

[0019] Preferably, a force receiving ring is integrally formed on the outer side wall of the nozzle. The force receiving ring is an annular convex structure with a semicircular cross-section. The force receiving ring is cast from spring steel. One side of the force receiving ring is connected to the outer side wall of the nozzle, and the other side of the force receiving ring is separated from the outer side wall of the nozzle.

[0020] Preferably, a movable groove is opened on the lock prevention seat. A top rod groove is opened at the bottom of the movable groove. A support spring and a movable plate are movably installed in the movable groove. One end of the support spring is fixedly connected to the movable plate, and the other end of the support spring is connected with a force receiving plate. The force receiving plate abuts against the end face of the nozzle body. An opening groove is opened on the side wall of the movable groove. A push rod is fixedly welded on the side wall of the movable plate. The push rod is movably arranged in the opening groove. A top rod is integrally formed on the movable plate. The top rod is movably arranged in the top rod groove. A clamping hole is opened on the end face of the steel ball storage cover. A circle of clamping holes is arranged equidistantly.

[0021] Preferably, when the steel ball storage cover is actually tightened and the support spring is in the reset state, the end of the top rod is embedded in the clamping hole. After the push rod is pushed upward, the end of the top rod completely disengages from the clamping hole. The edge line position of the end face of the top rod is chamfered.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. By setting the spray head on the plasma spraying device to be composed of a spray head body, a cathode electrode, a primary feeding seat, a rotating feeding seat, a feeding spray head and an anode electrode, and rotatably installing the rotating feeding seat on the spray head body, the feeding spray head can perform rotating feeding, so that the spray head body can spray more evenly;

[0024] 2. By setting the feeding spray head to be composed of a spray head body and a nozzle, installing a steel ball storage cover on the threaded seat of the nozzle, and movably arranging steel balls in the steel ball groove between the steel ball storage cover and the nozzle, the rotation of the rotating feeding seat drives the steel balls to move, thereby generating an impact on the nozzle, effectively avoiding the problem of powder accumulation on the inner wall of the nozzle and nozzle blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of the present invention;

[0026] Figure 2 is a half-sectional view of the present invention;

[0027] Figure 3 is Figure 2 an enlarged schematic view of the structure at A in

[0028] Figure 4 is a half-sectional view of the spray head body of the present invention;

[0029] Figure 5 is a schematic structural diagram of the feeding spray head of the present invention;

[0030] Figure 6 is a half-sectional view of the feeding spray head of the present invention;

[0031] Figure 7 is Figure 6 an enlarged schematic view of the structure at B in

[0032] Figure 8 is Figure 7 an enlarged schematic view of the structure at C in

[0033] Figure 9 is Figure 7 an enlarged schematic view of the structure at D in

[0034] Figure 10 is a half-sectional view of the primary feeding seat of the present invention;

[0035] Figure 11 is a schematic diagram of the position of the primary feeding cavity of the present invention;

[0036] Figure 12 Structural schematic diagram of the rotary feeding seat of the present invention;

[0037] Figure 13 Half-sectional view of the rotary feeding seat of the present invention;

[0038] Figure 14 Structural schematic diagram of the steel ball storage cover of the present invention.

[0039] In the figure: spray head body 1, cathode electrode 2, primary feeding seat 3, rotary feeding seat 4, feeding spray head 5, anode electrode 6, installation cavity 7, air supply cavity 8, air inlet channel 9, threaded groove 10, primary bearing groove 11, threaded hole 12, primary feeding cavity 13, powder feeding port 14, primary guiding hole 15, secondary bearing groove 16, secondary feeding cavity 17, central air hole 18, edge guiding hole 19, tertiary bearing groove 20, quaternary bearing groove 21, primary sealing bearing 22, secondary sealing bearing 23, connecting flange 24, annular gear 25, motor bracket 26, reduction motor 27, transmission gear 28, spray head body 29, nozzle 30, threaded seat 31, steel ball storage cover 32, steel ball groove 34, steel ball 35, force-bearing ring 36, movable groove 37, support spring 38, movable plate 39, force-bearing plate 40, ejector rod 41, push rod 42, engaging hole 43, anti-loosening seat 49, rear cover plate 50. Specific embodiments

[0040] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0041] Please refer to Figures 1 - 14 , the present invention provides embodiments of the following three preferred solutions:

[0042] Example 1: A plasma spraying device with an anti-clogging structure, including a spraying device main body and a spraying nozzle. The spraying nozzle includes a nozzle main body 1, a cathode electrode 2, a primary feeding seat 3, a rotating feeding seat 4, a feeding nozzle 5 and an anode electrode 6. An installation cavity 7 and an air supply cavity 8 are formed on the nozzle main body 1. An air inlet channel 9 is arranged at the edge of the installation cavity 7. The air inlet channel 9 is connected to a plasma gas supply device through an air supply pipeline. The cathode electrode 2 is installed in the installation cavity 7 and is connected to the negative pole of the power supply. The primary feeding seat 3 is arranged in a ring shape and is installed on the nozzle main body 1. A primary feeding cavity 13 is formed on the primary feeding seat 3. A primary guiding hole 15 is formed at the front end of the primary feeding cavity 13. A powder feeding port 14 is arranged at the rear end of the primary guiding hole 15. The powder feeding port 14 is connected to a powder supply device through a powder pipeline. The rotating feeding seat 4 is rotatably installed on the nozzle main body 1. A secondary feeding cavity 17 is formed on the rotating feeding seat 4. A middle air hole 18 and an edge guiding hole 19 are formed at the front end of the secondary feeding cavity 17. The middle air hole 18 is arranged in alignment with the air supply cavity 8. The feeding nozzle 5 is connected to the front end of the nozzle main body 1 through a connecting flange 24, and the feeding end of the feeding nozzle 5 is arranged in alignment with the edge guiding hole 19. The anode electrode 6 is fixed on the rear end face of the nozzle main body 1. The rear end of the installation cavity 7 is open, and a threaded groove 10 is formed at the rear end port of the installation cavity 7. A rear cover plate 50 is screwed and installed in the threaded groove 10. The cathode electrode 2 is positioned in the installation cavity 7 through the rear cover plate 50. Threaded holes 12 are formed on the nozzle main body 1. Connecting ear plates are integrally formed at the front and rear ends of the primary feeding seat 3. Installation holes are formed on the connecting ear plates and are arranged in correspondence with the threaded holes 12. The connecting ear plates are fixed on the nozzle main body 1 through positioning screws.

[0043] A primary bearing groove 11 is formed at the front end of the nozzle main body 1. A secondary bearing groove 16 is formed at the front end of the primary feeding seat 3. A tertiary bearing groove 20 is formed at the rear end of the rotating feeding seat 4. A quaternary bearing groove 21 is formed at the rear end port of the middle air hole 18. The secondary bearing groove 16 and the tertiary bearing groove 20 are arranged in correspondence with each other, and a primary sealing bearing 22 is arranged between the secondary bearing groove 16 and the tertiary bearing groove 20. The primary bearing groove 11 and the quaternary bearing groove 21 are arranged in correspondence with each other, and a secondary sealing bearing 23 is arranged between the primary bearing groove 11 and the quaternary bearing groove 21. The rotating feeding seat 4 is rotationally connected through the primary sealing bearing 22 and the secondary sealing bearing 23. By setting the spraying nozzle on the plasma spraying device to be composed of a combination of a nozzle main body 1, a cathode electrode 2, a primary feeding seat 3, a rotating feeding seat 4, a feeding nozzle 5 and an anode electrode 6, and rotatably installing the rotating feeding seat 4 on the nozzle main body 1, the feeding nozzle 5 can perform rotational feeding, so that the nozzle main body 1 can spray more evenly.

[0044] There are five feeding nozzles 5 and anode electrodes 6 arranged equidistantly around the nozzle body 1. The anode electrodes 6 are all connected to the positive pole of the power supply, and the anode electrodes 6 and the feeding nozzles 5 are arranged in a staggered manner. The port of the feeding nozzle 5 is arranged towards the center position of the nozzle body 1, and the feeding nozzles 5 and the anode electrodes 6 are arranged in a one-to-one correspondence. The anode electrodes 6 in five directions and the feeding nozzles 5 opposite to the five directions can enable the powder to spread better in five directions after melting, thereby effectively increasing the spraying coverage area.

[0045] There is a circle of first-stage guiding holes 15 arranged equidistantly. The first-stage guiding holes 15 are arranged in a flared shape, and the rear ends of adjacent first-stage guiding holes 15 are connected. The edge guiding holes 19 are arranged in the same way as the first-stage guiding holes 15. The flared first-stage guiding holes 15 and edge guiding holes 19 can effectively avoid blocking the powder.

[0046] An annular gear 25 is fixedly installed on the outer side wall of the rotating feeding base 4. A motor bracket 26 is fixedly installed on the rear side wall of the nozzle body 1. A reduction motor 27 is fixedly installed on the motor bracket 26. A transmission gear 28 is fixedly installed on the output shaft of the reduction motor 27, and the transmission gear 28 is meshed with the annular gear 25.

[0047] Embodiment 2: On the basis of Embodiment 1, the feeding nozzle 5 is composed of a nozzle body 29 and a nozzle 30. The nozzle body 29 and the nozzle 30 are connected by welding. A threaded seat 31 and an anti-loosening seat 49 are integrally formed on the root side wall of the nozzle 30. A steel ball storage cover 32 is screwed on the threaded seat 31. A steel ball groove 34 is formed by enclosing between the steel ball storage cover 32 and the outer side wall of the nozzle 30. A steel ball 35 is movably arranged in the steel ball groove 34. The gravity value of the steel ball 35 is greater than the centrifugal force generated by the steel ball 35 when the rotating feeding base 4 rotates. By setting the feeding nozzle 5 to be composed of the nozzle body 29 and the nozzle 30, installing the steel ball storage cover 32 on the threaded seat 31 of the nozzle 30, and movably arranging the steel ball 35 in the steel ball groove 34 between the steel ball storage cover 32 and the nozzle 30, the rotation of the rotating feeding base 4 drives the steel ball 35 to move, thereby generating an impact on the nozzle 30, effectively avoiding the problem of powder accumulation on the inner wall of the nozzle 30 and nozzle blockage.

[0048] A force-receiving ring 36 is integrally formed on the outer side wall of the nozzle 30. The force-receiving ring 36 is a ring-shaped convex structure with a semi-circular cross-section. The force-receiving ring 36 is cast from spring steel. One side of the force-receiving ring 36 is connected to the outer side wall of the nozzle 30, and the other side of the force-receiving ring 36 is separated from the outer side wall of the nozzle 30. The setting of the force-receiving ring 36 can enable the steel ball 35 to be better subjected to force impact, thereby effectively improving the vibration cleaning effect on the nozzle 30.

[0049] Embodiment 3: On the basis of Embodiment 2, a movable groove 37 is formed in the anti-loosening seat 49. A ejector rod groove is formed at the bottom of the movable groove 37. A support spring 38 and a movable plate 39 are movably installed in the movable groove 37. One end of the support spring 38 is fixedly connected to the movable plate 39, and the other end of the support spring 38 is connected to a force-bearing plate 40. The force-bearing plate 40 is abutted against the end face of the nozzle body 29. An opening groove 48 is formed in the side wall of the movable groove 37. A push rod 42 is fixedly welded to the side wall of the movable plate 39. The push rod 42 is movably arranged in the opening groove 48. A ejector rod 41 is integrally formed on the movable plate 39. The ejector rod 41 is movably arranged in the ejector rod groove. A clamping hole 43 is formed in the end face of the steel ball storage cover 32. The clamping holes 43 are arranged in a circle at equal circumferences. The ejector rod 41 is embedded in the clamping hole 43, which can form a self-locking effect on the steel ball storage cover 32, thus effectively avoiding the loosening of the steel ball storage cover 32 caused by the impact and vibration force of the steel ball 35.

[0050] When the steel ball storage cover 32 is actually tightened and the support spring 38 is in the reset state, the end of the ejector rod 41 is embedded in the clamping hole 43. After the push rod 42 is pushed upward, the end of the ejector rod 41 completely disengages from the clamping hole 43. The edge position of the end face of the ejector rod 41 is chamfered to facilitate the alignment and insertion of the ejector rod 41 into the clamping hole 43.

[0051] Although the illustrative specific embodiments of the present application have been described above to enable those skilled in the art to understand the present application, the present application is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present application defined and determined by the appended claims, all application creations using the concept of the present application are within the scope of protection.

Claims

1. A plasma spraying device with an anti-blocking structure, comprising a spraying device main body and a spraying nozzle, characterized in that: The spraying nozzle includes: A nozzle body (1), in which an installation cavity (7) and an air supply cavity (8) are formed. An air inlet channel (9) is arranged at the edge of the installation cavity (7), and the air inlet channel (9) is connected to a plasma gas supply device through an air supply pipeline; A cathode electrode (2), which is installed in the installation cavity (7) and is connected to the negative pole of a power supply; A primary feeding seat (3), which is annularly arranged and installed on the nozzle body (1). A primary feeding cavity (13) is formed in the primary feeding seat (3). A primary guiding hole (15) is formed at the front end of the primary feeding cavity (13), and a powder feeding port (14) is arranged at the rear end of the primary guiding hole (15). The powder feeding port (14) is connected to a powder supply device through a powder pipeline; A rotary feeding seat (4), which is rotatably installed on the nozzle body (1). A secondary feeding cavity (17) is formed in the rotary feeding seat (4). A middle air hole (18) and an edge guiding hole (19) are formed at the front end of the secondary feeding cavity (17), and the middle air hole (18) is arranged in alignment with the air supply cavity (8); A feeding nozzle (5), which is connected to the front end of the nozzle body (1) through a connecting flange (24), and the feeding end of the feeding nozzle (5) is arranged in alignment with the edge guiding hole (19); An anode electrode (6), which is fixed on the rear end face of the nozzle body (1).

2. The plasma spraying equipment with an anti-blocking structure according to claim 1, characterized in that: The rear end of the installation cavity (7) is open, and a threaded groove (10) is formed at the rear end port of the installation cavity (7). A rear cover plate (50) is screwed and installed in the threaded groove (10). The cathode electrode (2) is positioned in the installation cavity (7) through the rear cover plate (50). A threaded hole (12) is formed in the nozzle body (1). Connecting ear plates are integrally formed at the front and rear ends of the primary feeding seat (3), and mounting holes are formed in the connecting ear plates. The mounting holes are arranged in correspondence with the threaded hole (12), and the connecting ear plates are fixed on the nozzle body (1) through positioning screws.

3. A plasma spraying device with an anti-clogging structure according to claim 1, characterized in that: A primary bearing groove (11) is formed at the front end of the nozzle body (1). A secondary bearing groove (16) is formed at the front end of the primary feeding seat (3). A tertiary bearing groove (20) is formed at the rear end of the rotary feeding seat (4). A quaternary bearing groove (21) is formed at the rear end port of the middle air hole (18). The secondary bearing groove (16) and the tertiary bearing groove (20) are arranged in correspondence, and a primary sealing bearing (22) is arranged between the secondary bearing groove (16) and the tertiary bearing groove (20). The primary bearing groove (11) and the quaternary bearing groove (21) are arranged in correspondence, and a secondary sealing bearing (23) is arranged between the primary bearing groove (11) and the quaternary bearing groove (21). The rotary feeding seat (4) is rotationally connected through the primary sealing bearing (22) and the secondary sealing bearing (23).

4. The plasma spraying equipment with an anti-blocking structure according to claim 3, characterized in that: The feeding nozzle (5) and the anode electrode (6) are both arranged in five equal circles around the nozzle body (1). The anode electrodes (6) are all connected to the positive pole of the power supply, and the anode electrodes (6) and the feeding nozzles (5) are arranged in a staggered manner. The port of the feeding nozzle (5) is arranged towards the center position of the nozzle body (1), and the feeding nozzles (5) and the anode electrodes (6) are arranged in a one-to-one correspondence.

5. A plasma spraying device with an anti-clogging structure according to claim 4, characterized in that: A circle of the first-stage guiding holes (15) is arranged in an equal circle. The first-stage guiding holes (15) are arranged in a horn shape, and the rear ends of adjacent first-stage guiding holes (15) are connected. The edge guiding holes (19) are arranged in the same way as the first-stage guiding holes (15).

6. The plasma spraying equipment with an anti-clogging structure according to claim 5, wherein: An annular gear (25) is fixedly installed on the outer side wall of the rotary feeding seat (4). A motor bracket (26) is fixedly installed on the rear side wall of the nozzle body (1). A reduction motor (27) is fixedly installed on the motor bracket (26). A transmission gear (28) is fixedly installed on the output shaft of the reduction motor (27). The transmission gear (28) is meshed with the annular gear (25).

7. The plasma spraying device with an anti-clogging structure according to claim 6, characterized in that: The feeding nozzle (5) is composed of a nozzle body (29) and a nozzle (30) in combination. The nozzle body (29) and the nozzle (30) are connected by welding. A threaded seat (31) and a locknut seat (49) are integrally formed on the root side wall of the nozzle (30). A steel ball storage cover (32) is screwed on the threaded seat (31). A steel ball groove (34) is formed by enclosing between the steel ball storage cover (32) and the outer side wall of the nozzle (30). Steel balls (35) are movably arranged in the steel ball groove (34). The gravity value of the steel balls (35) is greater than the centrifugal force generated by the steel balls (35) when the rotary feeding seat (4) rotates.

8. A plasma spraying device with an anti-blocking structure according to claim 7, characterized in that: A force-receiving ring (36) is integrally formed on the outer side wall of the nozzle (30). The force-receiving ring (36) is an annular convex structure with a semicircular cross-section. The force-receiving ring (36) is cast from spring steel. One side of the force-receiving ring (36) is connected to the outer side wall of the nozzle (30), and the other side of the force-receiving ring (36) is separated from the outer side wall of the nozzle (30).

9. The plasma spraying device with an anti-blocking structure according to claim 8, characterized in that: The anti-loosening seat (49) is provided with a movable groove (37). A ejector rod groove is provided at the bottom of the movable groove (37). A support spring (38) and a movable plate (39) are movably installed in the movable groove (37). One end of the support spring (38) is fixedly connected to the movable plate (39), and the other end of the support spring (38) is connected to a force-receiving plate (40). The force-receiving plate (40) is abutted against the end face of the nozzle body (29). An opening groove (48) is provided on the side wall of the movable groove (37). A push rod (42) is fixedly welded on the side wall of the movable plate (39). The push rod (42) is movably arranged in the opening groove (48). A ejector rod (41) is integrally formed on the movable plate (39). The ejector rod (41) is movably arranged in the ejector rod groove. A clamping hole (43) is provided on the end face of the steel ball storage cover (32). The clamping holes (43) are arranged in a circle at equal circumferences.

10. A plasma spraying device with an anti-clogging structure according to claim 9, characterized in that: When the steel ball storage cover (32) is actually tightened and the support spring (38) is in a reset state, the end of the ejector rod (41) is embedded into the clamping hole (43). After the push rod (42) is pushed upward, the end of the ejector rod (41) completely disengages from the clamping hole (43). The edge position of the end face of the ejector rod (41) is chamfered.

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