Ion spraying device for metal surface coating

Abstract

The invention relates to the technical field of plasma spraying, in particular to an ion spraying device for a metal surface coating, which comprises a base, a preheating ring and an outer frame are arranged on the base, the base and the preheating ring are fixedly mounted through a support column, and the base and the outer frame are fixedly mounted through a support plate. A preheating ring is arranged in the outer frame, an annular electric heating plate is installed in the preheating ring, a plurality of rotating plates are arranged in the outer frame, plasma spraying heads are installed on the rotating plates, an adjusting mechanism used for adjusting the plasma spraying heads is arranged in the outer frame, and synchronizing mechanisms used for adjusting the positions of the plasma spraying heads are arranged on the rotating plates. Compared with the prior art, when spline workpieces are sprayed, the direction of the workpieces does not need to be changed frequently, the temperature change of the workpieces is small, the flame flow length of plasma spraying is compensated, and the uniformity of workpiece spraying is improved.

Description

Technical Field

[0001] This invention relates to the field of plasma spraying technology, specifically to an plasma spraying apparatus for coating metal surfaces. Background Technology

[0002] Plasma spraying is a technology for strengthening and modifying material surfaces. It can give the substrate surface 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 then sprays them at high speed onto the pre-treated workpiece surface to form a firmly adhered surface layer. Plasma spraying also has medical applications, such as spraying a coating of tens of micrometers onto the surface of artificial bones to strengthen the artificial bones and enhance their biocompatibility.

[0003] When performing plasma spraying on spline-shaped workpieces, it is necessary to frequently change the workpiece's orientation during the spraying process. During this process, the workpiece's temperature changes rapidly within a short period of time. When re-spraying, the change in the initial spraying temperature leads to differences in the uniformity of the spraying. If the workpiece surface has depressions or protrusions, the length of the flame will change when the plasma spraying reaches these points, resulting in significant differences in the uniformity of the spraying and causing uneven spraying.

[0004] Therefore, based on the above problems, we have invented an ion spraying device for coating metal surfaces. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an ion spraying apparatus for metal surface coatings, thereby solving the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an ion spraying device for metal surface coating, comprising a base, a preheating ring and an outer frame on the base, the base and the preheating ring being fixedly installed by a support column, an annular electric heating plate installed inside the preheating ring, the base and the outer frame being fixedly installed by a support plate, a plurality of rotating plates inside the outer frame, plasma spraying heads mounted on the rotating plates, an adjustment mechanism for adjusting the plasma spraying heads inside the outer frame, and a synchronization mechanism for adjusting the position of the plasma spraying heads on the rotating plates.

[0007] Furthermore, the adjustment mechanism includes a fixed ring disposed within the outer frame, the fixed ring being fixed to the inner wall of the outer frame by a fixed plate, an orientation adjustment frame being rotatably mounted on the fixed ring, a rotating motor being mounted on the side wall of the fixed plate, the drive shaft of the rotating motor rotatably passing through the fixed plate and coaxially mounted with a rotating gear, an annular toothed groove being provided on the orientation adjustment frame to mesh with the rotating gear, a rotating column being rotatably mounted on the inner wall of the orientation adjustment frame, a rotating plate being fixedly mounted with the rotating column, an arc-shaped hole being provided on the orientation adjustment frame, and a fine-tuning mechanism for rotating the rotating plate being provided within the arc-shaped hole.

[0008] Furthermore, the fine-tuning mechanism includes an intermediate block rotatably mounted to the inner wall of the arc-shaped hole. The intermediate block contains a fine-tuning cavity, and a fine-tuning screw is located within the cavity. A sliding sleeve is slidably fitted around the fine-tuning screw, and the sliding sleeve is rotatably mounted to the inner wall of the fine-tuning cavity. Both ends of the fine-tuning screw are threaded through the intermediate block, and one end of the screw is rotatably mounted to one side of a rotating plate. An intermediate shaft is located within the fine-tuning cavity, and the intermediate shaft is connected to the sliding sleeve via a first bevel gear set. One end of the intermediate shaft rotatably passes through the intermediate block and is coaxially mounted with a first transmission gear. A fine-tuning transmission ring is rotatably mounted outside the orientation adjustment frame, and the fine-tuning transmission ring has annular toothed grooves that mesh with multiple first transmission gears. A second drive motor is mounted on the inner wall of the arc-shaped hole, and the drive shaft of the second drive motor rotatably passes through the orientation adjustment frame and is coaxially mounted with a second drive gear. The outer wall of the fine-tuning transmission ring has a groove for engaging with the second drive motor. The rotating plate has a fine-tuning groove, and a movable screw is rotatably installed in the fine-tuning groove. A threaded block is threaded onto the external thread of the movable screw, and the threaded block is slidably connected to the inner wall of the fine-tuning groove. A cavity is provided inside the rotating column. One end of the movable screw rotatably passes through the rotating plate and the rotating column and extends into the cavity. A drive shaft is provided inside the cavity. The drive shaft and the movable screw are connected by a second bevel gear set. One end of the drive shaft rotatably passes through the rotating column and is coaxially mounted with a second transmission gear. A drive transmission ring is rotatably installed outside the orientation adjustment frame. The drive transmission ring has annular grooves that mesh with multiple second transmission gears. A fixing block is installed on the inner wall of the orientation adjustment frame. A first drive motor is installed on one side of the fixing block. The drive shaft of the first drive motor rotatably passes through the fixing block and is coaxially mounted with a first drive gear. The drive transmission ring has annular grooves that mesh with the first drive gear.

[0009] Furthermore, the first bevel gear set includes a first bevel gear and a second bevel gear that mesh with each other, the first bevel gear being coaxially mounted with the intermediate shaft, and the second bevel gear being coaxially mounted with the sliding sleeve.

[0010] Furthermore, the second bevel gear set includes a third bevel gear and a fourth bevel gear that mesh with each other. The third bevel gear is coaxially mounted with the drive shaft, and the fourth bevel gear is coaxially mounted with the moving screw.

[0011] Furthermore, the synchronization mechanism includes a connecting plate fixedly installed on the outer wall of the rotating plate. A detection frame is installed on the connecting plate, and a detection rod is provided inside the detection frame. One end of the detection rod slides through the connecting plate and is equipped with a roller. A sliding plate is installed at the end of the detection rod located inside the detection frame. The sliding plate is slidably installed with the inner wall of the detection frame. A distance sensor is installed on the sliding plate. A return spring is sleeved on the detection rod. The two ends of the return spring are fixed to the sliding plate and the connecting plate, respectively. An mounting block is installed on the threaded block. A telescopic motor is embedded in the mounting block. The drive shaft of the telescopic motor slides through the mounting block and is fixedly installed with the plasma spraying head. The distance sensor is electrically connected to the telescopic motor.

[0012] Furthermore, multiple plasma spray heads are arranged in a ring array inside the orientation adjustment frame.

[0013] Furthermore, each of the plasma spray heads is controlled by an independent switch.

[0014] Compared with the prior art, the present invention provides an ion spraying device for metal surface coating, which has the following beneficial effects: 1. By setting up adjustment and fine-tuning mechanisms, the position of the plasma spraying head is adjusted according to the type and shape of the spline-type workpiece, so that the plasma spraying head corresponds to the spline. When performing plasma spraying on the workpiece, it is not necessary to frequently change the position of the workpiece. During the spraying process, the temperature change of the workpiece itself will not be too large, which improves the uniformity of the spraying.

[0015] 2. By setting a synchronization mechanism, the protrusions and depressions of the workpiece can be detected, and the difference in spraying distance between the protrusions and depressions can be compensated, so that the distance between the plasma spraying head and the workpiece is always consistent, and the spraying flame length of the plasma spraying head is always kept within a certain range, thereby improving the uniformity of spraying the workpiece.

[0016] When spraying spline-type workpieces, this application eliminates the need to frequently change the workpiece orientation, minimizes workpiece temperature changes, and compensates for the flame length during plasma spraying, thereby improving the uniformity of workpiece spraying. Attached Figure Description

[0017] Figure 1 This is a front view of the present invention. Figure 2 This is a schematic diagram of the preheating ring in this invention; Figure 3This is a perspective view of the internal structure of the outer frame in this invention; Figure 4 This is a schematic diagram of the front structure inside the outer frame in this invention; Figure 5 This is a schematic diagram of the rear view structure inside the outer frame in this invention; Figure 6 This is a perspective view of the side structure inside the outer frame in this invention; Figure 7 This is a perspective view of the fine-tuning mechanism and synchronization mechanism in this invention; Figure 8 for Figure 7 Enlarged view of point A in the middle; Figure 9 This is a partial perspective view of the synchronization mechanism in this invention.

[0018] In the diagram: 1. Base; 2. Preheating ring; 3. Support column; 4. Annular electric heating plate; 5. Outer frame; 6. Support plate; 7. Adjustment mechanism; 8. Orientation adjustment frame; 9. Fixing plate; 10. Arc-shaped hole; 11. Rotating plate; 12. Plasma spray head; 13. Fine-tuning mechanism; 14. Synchronization mechanism; 15. Intermediate block; 16. Fine-tuning screw; 17. First bevel gear set; 18. Intermediate shaft; 19. First transmission gear; 20. Fine-tuning transmission ring; 21. First bevel gear; 22. Second bevel gear; 23. Fine-tuning groove; 24. Moving screw; 25. Threaded block; 26. Rotating column; 27. Cavity 28. Mounting block; 29. ​​Telescopic motor; 30. Second bevel gear set; 31. Third bevel gear; 32. Fourth bevel gear; 33. Drive shaft; 34. Second transmission gear; 35. Drive transmission ring; 36. Rotating gear; 37. Rotating motor; 38. Fine-tuning cavity; 39. Connecting plate; 40. Detection frame; 41. Detection rod; 42. Roller; 43. Distance sensor; 44. Slide plate; 45. Return spring; 46. Sliding sleeve; 47. Fixing ring; 48. Fixing block; 49. First drive motor; 50. First drive gear; 51. Second drive motor; 52. Second drive gear. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 are within the scope of protection of the present invention.

[0020] As described in the background section, there are shortcomings in the existing technology. In order to solve the above-mentioned technical problems, this application proposes an ion spraying device for metal surface coating.

[0021] like Figures 1-9 As shown, an ion spraying device for metal surface coating includes a base 1, a preheating ring 2 and an outer frame 5 on the base 1, the base 1 and the preheating ring 2 are fixedly installed by a support column 3, an annular electric heating plate 4 is installed inside the preheating ring 2, the base 1 and the outer frame 5 are fixedly installed by a support plate 6, a plurality of rotating plates 11 are provided inside the outer frame 5, plasma spraying heads 12 are installed on the rotating plates 11, an adjustment mechanism 7 for adjusting the plasma spraying heads 12 is provided inside the outer frame 5, and a synchronization mechanism 14 for adjusting the position of the plasma spraying heads 12 is provided on the rotating plates 11. It should be noted that the plurality of plasma spraying heads 12 are distributed in a ring array inside the orientation adjustment frame 8, and the plurality of plasma spraying heads 12 are all controlled by independent switches.

[0022] In this invention, the adjustment mechanism 7 includes a fixing ring 47 disposed within the outer frame 5. The fixing ring 47 is fixed to the inner wall of the outer frame 5 by a fixing plate 9. An orientation adjustment frame 8 is rotatably mounted on the fixing ring 47. A rotating motor 37 is mounted on the side wall of the fixing plate 9. The drive shaft of the rotating motor 37 rotatably passes through the fixing plate 9 and is coaxially mounted with a rotating gear 36. The orientation adjustment frame 8 is provided with an annular toothed groove that meshes with the rotating gear 36. A rotating column 26 is rotatably mounted on the inner wall of the orientation adjustment frame 8. The rotating plate 11 is fixedly mounted to the rotating column 26. The orientation adjustment frame 8 is provided with an arc-shaped hole 10. A fine-tuning mechanism 13 for rotating the rotating plate 11 is provided in the arc-shaped hole 10.

[0023] In this invention, the fine-tuning mechanism 13 includes an intermediate block 15 rotatably mounted to the inner wall of the arc-shaped hole 10. The intermediate block 15 contains a fine-tuning cavity 38, and the fine-tuning cavity 38 contains a fine-tuning screw 16. A sliding sleeve 46 is slidably fitted around the fine-tuning screw 16, and the sliding sleeve 46 is rotatably mounted to the inner wall of the fine-tuning cavity 38. Both ends of the fine-tuning screw 16 are threaded through the intermediate block 15, and one end of the fine-tuning screw 16 is rotatably mounted to one side of the rotating plate 11. An intermediate shaft 18 is provided within the fine-tuning cavity 38, and the intermediate shaft 18 and the sliding sleeve 46 are connected via a first bevel gear set 17. Notably, the first bevel gear set 17 includes a first bevel gear 21 and a second bevel gear 22 that mesh with each other. The first bevel gear 21 is coaxially mounted with the intermediate shaft 18, and the second bevel gear 22 is coaxially mounted with the sliding sleeve 46. One end of the intermediate shaft 18 rotatably passes through the intermediate block 15 and is coaxially mounted with the first transmission gear 19. A fine-tuning transmission ring 20 is rotatably mounted on the outside of the orientation adjustment frame 8. The fine-tuning transmission ring 20 is provided with annular tooth grooves that mesh with multiple first transmission gears 19. A second drive motor 51 is mounted on the inner wall of the arc-shaped hole 10. The drive shaft of the second drive motor 51 rotatably passes through the orientation adjustment frame 8 and is coaxially mounted with the second drive gear 52. The outer wall of the fine-tuning transmission ring 20 is provided with annular tooth grooves that mesh with the second drive motor 51. A fine-tuning groove 23 is provided on the rotating plate 11.

[0024] In this invention, a movable screw 24 is rotatably mounted inside the fine-tuning groove 23. A threaded block 25 is threaded onto the external thread of the movable screw 24, and the threaded block 25 is slidably connected to the inner wall of the fine-tuning groove 23. A cavity 27 is provided inside the rotating column 26. One end of the movable screw 24 rotatably passes through the rotating plate 11 and the rotating column 26 and extends into the cavity 27. A drive shaft 33 is provided inside the cavity 27. The drive shaft 33 and the movable screw 24 are connected by a second bevel gear set 30. It should be noted that the second bevel gear set 30 includes a third bevel gear 31 and a fourth bevel gear 32 that mesh with each other. The third bevel gear 31 is coaxially mounted with the drive shaft 33. The fourth bevel gear 32 is coaxially mounted with the moving screw 24. One end of the drive shaft 33 rotates through the rotating column 26 and is coaxially mounted with the second transmission gear 34. A drive transmission ring 35 is rotatably mounted on the outside of the orientation adjustment frame 8. The drive transmission ring 35 is provided with annular tooth grooves that mesh with multiple second transmission gears 34. A fixing block 48 is installed on the inner wall of the orientation adjustment frame 8. A first drive motor 49 is installed on one side of the fixing block 48. The drive shaft of the first drive motor 49 rotates through the fixing block 48 and is coaxially mounted with the first drive gear 50. The drive transmission ring 35 is provided with annular tooth grooves that mesh with the first drive gear 50.

[0025] Through the above technical features: the drive shaft of the second drive motor 51 drives the second drive gear 52 to rotate, the second drive gear 52 drives the fine-tuning transmission ring 20 to rotate, the fine-tuning transmission ring 20 drives multiple first transmission gears 19 to rotate, the first transmission gears 19 drive the intermediate shaft 18 to rotate, the intermediate shaft 18 drives the sliding sleeve 46 to rotate, the sliding sleeve 46 drives the fine-tuning screw 16 to rotate, the fine-tuning screw 16 moves under the action of the thread, the fine-tuning screw 16 pushes the rotating plate 11 to rotate around the rotating column 26, the second bevel gear 22 drives the plasma spraying head 12 to rotate until the appropriate position, the first drive motor 49 drives the first drive gear 50 to rotate, the first drive gear 50 drives the drive transmission ring 35 to rotate. The drive transmission ring 35 drives multiple second transmission gears 34 to rotate, the second transmission gears 34 drive the moving screw 24 to rotate, the moving screw 24 drives the threaded block 25 to move, and the threaded block 25 drives the plasma spraying head 12 to move until it reaches the appropriate position. The plasma spraying head 12 can be adjusted to the appropriate position. Since multiple sheet plates are distributed in an array on the outer side of the spline-type workpiece, the spraying angle of the plasma spraying head 12 can be adjusted according to the angle of the sheet plate array until the plasma spraying head 12 is perpendicular to the surface of the sheet plate. It has a wide range of applications. During the spraying process, it is not necessary to frequently change the position of the workpiece. During the spraying process, the temperature change of the workpiece itself will not be too large, which improves the uniformity of the spraying of the workpiece.

[0026] In this invention, the synchronization mechanism 14 includes a connecting plate 39 fixedly installed on the outer wall of the rotating plate 11. A detection frame 40 is installed on the connecting plate 39. A detection rod 41 is provided inside the detection frame 40. One end of the detection rod 41 slides through the connecting plate 39 and is equipped with a roller 42. A sliding plate 44 is installed at the end of the detection rod 41 located inside the detection frame 40. The sliding plate 44 is slidably installed with the inner wall of the detection frame 40. A distance sensor 43 is installed on the sliding plate 44. A return spring 45 is sleeved on the detection rod 41. The two ends of the return spring 45 are fixed to the sliding plate 44 and the connecting plate 39, respectively. An installation block 28 is installed on the threaded block 25. A telescopic motor 29 is embedded in the installation block 28. The drive shaft of the telescopic motor 29 slides through the installation block 28 and is fixedly installed with the plasma spray head 12. The distance sensor 43 is electrically connected to the telescopic motor 29.

[0027] Through the above technical features: during the workpiece spraying process, when the workpiece is continuously conveyed at a uniform speed, the roller 42 will roll on the surface of the workpiece. When the roller 42 rolls to the protrusion or depression of the workpiece, the detection rod 41 extends and retracts under the action of the return spring 45, driving the distance sensor 43 to move. At this time, the distance detected by the distance sensor 43 changes, and the change signal is transmitted to the telescopic motor 29. After a period of time, when the protrusion or depression moves to the position of the plasma spraying head 12, the telescopic motor 29 drives the plasma spraying head 12 to extend and retract, compensating for the spraying distance difference between the depression or protrusion, so that the distance between the plasma spraying head 12 and the workpiece is always consistent, and the flame length of the plasma spraying head 12 is always kept within a certain range, thereby improving the uniformity of the workpiece spraying.

[0028] Working principle: The second drive motor 51 drives the second drive gear 52 to rotate via its drive shaft. The second drive gear 52 drives the fine-tuning transmission ring 20 to rotate, which in turn drives multiple first transmission gears 19 to rotate. The first transmission gears 19 drive the intermediate shaft 18 to rotate, which in turn drives the sliding sleeve 46 to rotate. The sliding sleeve 46 drives the fine-tuning screw 16 to rotate, which moves under the action of the thread. The fine-tuning screw 16 pushes the rotating plate 11 to rotate around the rotating column 26. The second bevel gear 22 drives the plasma spraying head 12 to rotate until it reaches the appropriate position. The first drive motor 49 then drives the first drive gear 50 to rotate, which in turn drives the drive transmission ring 35 to rotate. The moving ring 35 drives multiple second transmission gears 34 to rotate, the second transmission gears 34 drive the moving screw 24 to rotate, the moving screw 24 drives the threaded block 25 to move, and the threaded block 25 drives the plasma spraying head 12 to move until it reaches the appropriate position. The plasma spraying head 12 can be adjusted to the appropriate position. Since multiple sheet plates are distributed in an array on the outer side of the spline-type workpiece, the spraying angle of the plasma spraying head 12 can be adjusted according to the angle of the sheet plate array until the plasma spraying head 12 is perpendicular to the surface of the sheet plate. It has a wide range of applications. During the spraying process, it is not necessary to frequently change the position of the workpiece. During the spraying process, the temperature change of the workpiece itself will not be too large, which improves the uniformity of the workpiece spraying. During the workpiece spraying process, when the workpiece is continuously conveyed at a uniform speed, the roller 42 rolls on the surface of the workpiece. When the roller 42 rolls to the protrusion or depression of the workpiece, the detection rod 41 extends and retracts under the action of the return spring 45, driving the distance sensor 43 to move. At this time, the distance detected by the distance sensor 43 changes, and the change signal is transmitted to the telescopic motor 29. After a period of time, when the protrusion or depression moves to the position of the plasma spraying head 12, the telescopic motor 29 drives the plasma spraying head 12 to extend and retract, compensating for the spraying distance difference between the depression and the protrusion, so that the distance between the plasma spraying head 12 and the workpiece remains consistent, and the flame length of the plasma spraying head 12 remains within a certain range, thereby improving the uniformity of the workpiece spraying.

[0029] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0030] The detailed descriptions listed above are merely specific descriptions of feasible implementation methods of this application and are not intended to limit the scope of protection of this application. All equivalent implementation methods or modifications made without departing from the spirit of the art of this application should be included within the scope of protection of this invention.

Claims

1. An ion spraying apparatus for coating metal surfaces, characterized in that: Includes a base (1), on which a preheating ring (2) and an outer frame (5) are provided. The base (1) and the preheating ring (2) are fixedly installed by a support column (3). An annular electric heating plate (4) is installed inside the preheating ring (2). The base (1) and the outer frame (5) are fixedly installed by a support plate (6). Multiple rotating plates (11) are provided inside the outer frame (5). A plasma spraying head (12) is installed on the rotating plate (11). An adjustment mechanism (7) for adjusting the plasma spraying head (12) is provided inside the outer frame (5). A synchronization mechanism (14) for adjusting the position of the plasma spraying head (12) is provided on the rotating plate (11).

2. The ion spraying apparatus for metal surface coating according to claim 1, characterized in that: The adjustment mechanism (7) includes a fixing ring (47) set inside the outer frame (5). The fixing ring (47) is fixed to the inner wall of the outer frame (5) by a fixing plate (9). An orientation adjustment frame (8) is rotatably mounted on the fixing ring (47). A rotating motor (37) is mounted on the side wall of the fixing plate (9). The drive shaft of the rotating motor (37) rotates through the fixing plate (9) and is coaxially mounted with a rotating gear (36). The orientation adjustment frame (8) is provided with an annular tooth groove that meshes with the rotating gear (36). A rotating column (26) is rotatably mounted on the inner wall of the orientation adjustment frame (8). The rotating plate (11) is fixedly mounted with the rotating column (26). The orientation adjustment frame (8) is provided with an arc-shaped hole (10). A fine adjustment mechanism (13) for rotating the rotating plate (11) is provided in the arc-shaped hole (10).

3. An ion spraying apparatus for metal surface coating according to claim 2, characterized in that: The fine-tuning mechanism (13) includes an intermediate block (15) rotatably mounted to the inner wall of the arc-shaped hole (10). The intermediate block (15) contains a fine-tuning cavity (38), and the fine-tuning cavity (38) contains a fine-tuning screw (16). A sliding sleeve (46) is slidably fitted around the fine-tuning screw (16). The sliding sleeve (46) is rotatably mounted to the inner wall of the fine-tuning cavity (38). Both ends of the fine-tuning screw (16) are threaded through the intermediate block (15). One end of the fine-tuning screw (16) is rotatably mounted to one side of the rotating plate (11). An intermediate shaft (18) is provided inside the fine-tuning cavity (38). The intermediate shaft (18) and the sliding sleeve (46) are connected... The intermediate shaft (18) is connected by a first bevel gear set (17). One end of the intermediate shaft (18) rotates through the intermediate block (15) and is coaxially mounted with a first transmission gear (19). A fine-tuning transmission ring (20) is rotatably mounted on the outside of the orientation adjustment frame (8). The fine-tuning transmission ring (20) is provided with annular tooth grooves that mesh with multiple first transmission gears (19). A second drive motor (51) is mounted on the inner wall of the arc-shaped hole (10). The drive shaft of the second drive motor (51) rotates through the orientation adjustment frame (8) and is coaxially mounted with a second drive gear (52). The outer wall of the fine-tuning transmission ring (20) is provided with a tooth groove that meshes with the second drive motor (51). The rotating plate (11) has a fine-tuning groove (23), and a movable screw (24) is rotatably installed in the fine-tuning groove (23). A threaded block (25) is threaded onto the external thread of the movable screw (24). The threaded block (25) is slidably connected to the inner wall of the fine-tuning groove (23). A cavity (27) is provided in the rotating column (26). One end of the movable screw (24) rotatably passes through the rotating plate (11) and the rotating column (26) and extends into the cavity (27). A drive shaft (33) is provided in the cavity (27). The drive shaft (33) and the movable screw (24) are connected by a second bevel gear set (30). One end of the directional adjustment frame (8) rotates through the rotating column (26) and is coaxially mounted with a second transmission gear (34). A drive transmission ring (35) is rotatably mounted on the outside of the directional adjustment frame (8). The drive transmission ring (35) is provided with annular tooth grooves that mesh with multiple second transmission gears (34). A fixing block (48) is installed on the inner wall of the directional adjustment frame (8). A first drive motor (49) is installed on one side of the fixing block (48). The drive shaft of the first drive motor (49) rotates through the fixing block (48) and is coaxially mounted with a first drive gear (50). The drive transmission ring (35) is provided with annular tooth grooves that mesh with the first drive gear (50).

4. An ion spraying apparatus for metal surface coating according to claim 3, characterized in that: The first bevel gear set (17) includes a first bevel gear (21) and a second bevel gear (22) that mesh with each other. The first bevel gear (21) is coaxially mounted with the intermediate shaft (18), and the second bevel gear (22) is coaxially mounted with the sliding sleeve (46).

5. An ion spraying apparatus for metal surface coating according to claim 3, characterized in that: The second bevel gear set (30) includes a third bevel gear (31) and a fourth bevel gear (32) that mesh with each other. The third bevel gear (31) is coaxially mounted with the drive shaft (33), and the fourth bevel gear (32) is coaxially mounted with the moving screw (24).

6. An ion spraying apparatus for metal surface coating according to claim 3, characterized in that: The synchronization mechanism (14) includes a connecting plate (39) fixedly installed on the outer wall of the rotating plate (11). A detection frame (40) is installed on the connecting plate (39). A detection rod (41) is provided inside the detection frame (40). One end of the detection rod (41) slides through the connecting plate (39) and is equipped with a roller (42). A sliding plate (44) is installed on the end of the detection rod (41) inside the detection frame (40). The sliding plate (44) is slidably installed on the inner wall of the detection frame (40). A roller (42) is installed on the sliding plate (44). A distance sensor (43) is provided. The detection rod (41) is fitted with a return spring (45). The two ends of the return spring (45) are fixed to the slide plate (44) and the connecting plate (39) respectively. An installation block (28) is installed on the threaded block (25). A telescopic motor (29) is embedded in the installation block (28). The drive shaft of the telescopic motor (29) slides through the installation block (28) and is fixedly installed with the plasma spray head (12). The distance sensor (43) is electrically connected to the telescopic motor (29).

7. An ion spraying apparatus for metal surface coating according to claim 1, characterized in that: Multiple plasma spray heads (12) are arranged in a ring array inside the orientation adjustment frame (8).

8. An ion spraying apparatus for metal surface coating according to claim 1, characterized in that: Each of the plasma spray heads (12) is controlled by an independent switch.

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