Inner hole plasma spraying device with deflection angle spraying function

Abstract

The invention relates to the technical field of plasma spraying, and discloses an inner hole plasma spraying device with a drift angle spraying function, which comprises a spraying table, and further comprises a cylindrical part arranged above the spraying table and used for spraying the inner wall of the cylindrical part; the operation frame is arranged below the spraying table and used for supporting the spraying table; the two clamping mechanisms are arranged above the spraying table and used for clamping the cylindrical parts; the driving mechanism is arranged above the spraying table and used for driving the cylindrical part to rotate; and the rotating mechanism is arranged above the spraying table. The uniform-speed rotation of the cylindrical part is combined with the axial swing of the spray head, so that the plasma jet can cover the whole inner wall surface, and the conditions that in traditional inner hole spraying, due to the fact that the spray head is fixed or only rotates in a single mode, the thickness of a coating is not uniform, and axial stripes or coating missing areas exist are overcome; and the uniformity, compactness and bonding strength of the inner wall coating are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of plasma spraying technology, specifically to an internal hole plasma spraying device with off-angle spraying function. Background Technology

[0002] Plasma spraying technology, as an important surface engineering technology, is widely used for surface strengthening, repair, and functional coating preparation of key components such as mechanical parts and aerospace parts. The demand for plasma spraying on the inner walls of cylindrical parts, such as hydraulic cylinder barrels, engine cylinder liners, and pipe inner walls, is increasing, aiming to improve their wear resistance, corrosion resistance, or high-temperature resistance. However, current plasma spraying techniques for the inner walls of cylindrical parts still face a series of technical challenges: Traditional internal hole spraying methods often involve inserting the spray gun into the hole and fixing it or moving it only in a straight line. Due to the directionality of plasma jets and the "beam" characteristics of energy and powder distribution, fixed spraying can lead to significant uneven thickness distribution of the coating in the axial direction. Even in the circumferential direction, the single motion mode of the rotating part can produce uneven coatings in the form of "stripes" or "spirals". Therefore, an internal hole plasma spraying device with an off-angle spraying function is proposed to solve the above-mentioned problems. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an internal hole plasma spraying device with an off-angle spraying function, which addresses the shortcomings of the prior art.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an internal hole plasma spraying device with off-angle spraying function, including a spraying station, and further comprising: A cylindrical part is positioned above the spraying station and is used to spray the inner wall of the cylindrical part. The operating frame is located below the spray booth and is used to support the spray booth. Two clamping mechanisms are located above the spraying station and are used to clamp cylindrical parts; The drive mechanism, located above the spraying station, is used to drive the cylindrical parts to rotate. A rotating mechanism, located above the spraying station, is used to support the clamping mechanism and rotate the cylindrical parts. The spraying angle deflection mechanism is located at the axis of the two clamping mechanisms and is used to spray the inside of cylindrical parts. The clamping mechanism includes: A disc is positioned on one side of the cylindrical part; A retaining ring is fixedly connected to the axis of the disk; Multiple clamping components are mounted on a disc for clamping cylindrical parts; The drive cylinder is fixedly connected to the disc and connected to the clamping assembly via a U-shaped connecting rod, and is used to drive the clamping assembly.

[0005] Preferably, the clamping assembly includes: Multiple cross grooves are equidistantly spaced on the disc, and a cross slide rod is slidably connected to the inner wall of each cross groove. The rotating sleeve is rotatably connected to the outer wall of the fixed ring, and the rotating sleeve is rectangular, with its four corners hinged to the cross slide rod through arc-shaped rods; The U-shaped connecting rod is hinged to one of the arc-shaped rods and the cross slide bar, and is used to push the cross slide bar to move.

[0006] Preferably, the clamping assembly further includes: Multiple arc-shaped pressure rods are rotatably connected in pairs to a pin at the end of the cross slide bar away from the arc-shaped rod, and the inner side of the arc is attached to the outer wall of the cylindrical part to clamp the cylindrical part. The fixing plate is fixedly connected to the outer wall of the cross slide bar, located on the outside of the arc-shaped pressure bar; Multiple contact plates are fixedly connected to the outer wall of the arc-shaped pressure rod at the rotation point away from the arc-shaped pressure rod; Multiple springs are fixedly connected between the fixed plate and the abutment plate to push the abutment plate against the arc-shaped pressure bar and fit it against the outer wall of the cylindrical part.

[0007] Preferably, the rotating mechanism includes: Two circular rails are fixedly connected to the outer walls of the two discs on either side; Two circular support bases are set above the spraying station, and the circular rails rotate on the circular support bases; Two brackets are fixedly connected to the outer walls of two circular support bases to support the circular support bases; Two adjusting blocks are fixedly connected to the bottom of the two brackets and slide within the sliding holes on the spraying table; A bidirectional screw is rotatably connected in the sliding hole and threadedly connected to two adjusting blocks respectively, used to drive the adjusting blocks to move; Motor 2 is installed on the outer wall of the spraying station. Its output end is connected to one end of the bidirectional screw to drive the bidirectional screw to rotate.

[0008] Preferably, the drive mechanism includes: The movable rod is slidably connected to the spraying table, and a mounting base is fixedly connected to the top of the movable rod; The rubber sleeve is rotatably connected to the mounting base via a drive shaft and is used to drive the cylindrical parts to rotate. Spring 2 is sleeved on the outer wall of the movable rod and is used to push the mounting base upward and push the rubber sleeve to adhere to the outer wall of the cylindrical part; Motor 1 is mounted on the outer wall of the mounting base, and its output end is connected to the drive shaft of the rubber tube to drive the rubber tube to rotate.

[0009] Preferably, the spraying angle deflection mechanism includes: Two sliding rods are slidably connected to the inner walls of the fixed rings on both sides; The deflection seat is fixedly connected between the two slide rods; A deflection sleeve is installed on the inner wall of the deflection seat, and a spray nozzle is installed on the deflection sleeve for spraying coating onto the inner wall of the cylindrical part. The conduit is installed on the inner wall of the right slide bar and connected to the deflection sleeve on the side away from the nozzle, for conveying paint.

[0010] Preferably, the spraying angle deflection mechanism further includes: The deflection shaft is fixedly connected to the outer wall of the deflection sleeve and deflects within the deflection seat; The gear is fixedly sleeved on the outer wall of the deflection shaft and located on the outer wall of the deflection seat; The push plate is slidably connected to the sliding holes on the two slide rods, and a rectangular hole is opened in the push plate, and a toothed groove is opened in the rectangular hole, and the toothed groove meshes with the gear. The push rod is fixedly connected in the cavity of the left slide rod, and the output end of the push rod is connected to the push plate to drive the gear to rotate.

[0011] Preferably, the deflection sleeve is arranged in a corrugated shape within a groove on the deflection seat.

[0012] The present invention, by adopting the above technical solution, can bring the following beneficial effects: 1. This internal hole plasma spraying device with off-angle spraying function combines the uniform rotation of the cylindrical part with the axial swing of the nozzle, so that the plasma jet can cover the entire inner wall surface. This overcomes the problems of uneven coating thickness, axial stripes or missed areas caused by the fixed nozzle or only single rotational motion in traditional internal hole spraying. It significantly improves the uniformity, density and bonding strength of the inner wall coating.

[0013] 2. This internal plasma spraying device with deflection spraying function synchronously drives the radial movement of four clamping points through a clamping mechanism. Combined with the setting of the rotating sleeve and the arc-shaped rod, it ensures the synchronization and consistency of the four cross slide bars, realizing automatic centering and clamping of cylindrical parts of different diameters without repeated manual adjustments. It has good versatility. Furthermore, the cooperation between the arc-shaped pressure rod and the spring forms an adaptive clamping unit. The spring force allows the pressure rod to closely fit the slightly elliptical or irregular outer circular surface, providing sufficient clamping force while avoiding surface damage or deformation of parts that may be caused by rigid clamping. It is especially suitable for precision or thin-walled parts.

[0014] 3. This internal plasma spraying device with deflection spraying function, through the set spraying angle deflection mechanism and the gear rack driven by the push rod, precisely converts linear motion into nozzle deflection. The deflection angle is controllable and adjustable. Combined with the axial sliding of the slide rod, it realizes two-dimensional flexible adjustment of nozzle depth and angle, which can adapt to the needs of hole wall spraying with different depths and inner diameters. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the cylindrical part of the present invention; Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the middle; Figure 4 This is a schematic diagram of the exploded structure of the present invention; Figure 5 For the present invention Figure 4 Enlarged structural diagram at point B; Figure 6 This is a schematic diagram of the spraying angle deflection mechanism of the present invention; Figure 7 This is a cross-sectional schematic diagram of the spraying angle deflection mechanism of the present invention.

[0016] In the diagram: 1. Cylindrical part; 2. Spray painting station; 3. Operating frame; 4. Clamping mechanism; 41. Disc; 42. Fixing ring; 43. Drive cylinder; 44. U-shaped connecting rod; 45. Clamping assembly; 451. Cross groove; 452. Rotating sleeve; 453. Arc rod; 454. Cross slide rod; 455. Fixing plate; 456. Arc pressure rod; 457. Contact plate; 458. Spring 1; 5. Drive mechanism; 51. Movable rod; 52. Mounting base; 53. Rubber sleeve; 54. Motor 1; 55. Spring 2; 6. Rotating mechanism; 61. Circular rail; 62. Circular support base; 63. Bracket; 64. Adjusting block; 65. Motor II; 7. Spraying angle deflection mechanism; 71. Slide rod; 72. Deflection seat; 73. Push rod; 74. Push plate; 75. Guide tube; 76. Deflection shaft; 77. Deflection sleeve; 78. Spray nozzle; 79. Gear. Detailed Implementation

[0017] 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.

[0018] Please see Figure 1-7 One embodiment of the present invention is: an internal hole plasma spraying device with off-angle spraying function, including a spraying station 2, and further comprising: A cylindrical part 1 is positioned above the spraying station 2 and is used to spray the inner wall of the cylindrical part 1. The operating frame 3 is located below the spraying station 2 and is used to support the spraying station 2; Two clamping mechanisms 4 are located above the spraying station 2 and are used to clamp the cylindrical part 1; The drive mechanism 5 is located above the spraying station 2 and is used to drive the cylindrical part 1 to rotate. The rotating mechanism 6 is located above the spraying station 2 and is used to support the clamping mechanism 4 and to rotate the cylindrical part 1. The spraying angle deflection mechanism 7 is located at the axis of the two clamping mechanisms 4 and is used to spray the inside of the cylindrical part 1. The clamping mechanism 4 includes: Disk 41 is disposed on one side of cylindrical part 1; The retaining ring 42 is fixedly connected to the axis of the disk 41; Multiple clamping components 45 are disposed on the disk 41 for clamping cylindrical part 1; The drive cylinder 43 is fixedly connected to the disc 41 and connected to the clamping assembly 45 via the U-shaped connecting rod 44, and is used to drive the clamping assembly 45.

[0019] Clamping assembly 45 includes: Multiple cross grooves 451 are equidistantly spaced on the disc 41, and a cross slide rod 454 is slidably connected to the inner wall of each cross groove 451. The rotating sleeve 452 is rotatably connected to the outer wall of the fixed ring 42, and the rotating sleeve 452 is rectangular, with its four corners hinged to the cross slide bar 454 through the arc rod 453; The U-shaped connecting rod 44 is connected to the hinge of one of the arc-shaped rods 453 and the cross slide rod 454, and is used to push the cross slide rod 454 to move.

[0020] Clamping assembly 45 also includes: Multiple arc-shaped pressure rods 456 are rotatably connected in pairs to the pin at the end of the cross slide rod 454 away from the arc-shaped rod 453, and the inner side of the arc is attached to the outer wall of the cylindrical part 1 for clamping the cylindrical part 1. The fixing plate 455 is fixedly connected to the outer wall of the cross slide bar 454, located on the outside of the arc-shaped pressure bar 456; Multiple contact plates 457 are fixedly connected to the outer wall of the arc-shaped pressure rod 456 at the rotation point away from the arc-shaped pressure rod 456; Multiple springs 458 are fixedly connected between the fixed plate 455 and the abutment plate 457, and are used to push the abutment plate 457 against the arc-shaped pressure rod 456 to fit against the outer wall of the cylindrical part 1.

[0021] Rotating mechanism 6 includes: Two circular rails 61 are fixedly connected to the outer walls of the discs 41 on both sides; Two circular support bases 62 are positioned above the spraying station 2, and a circular rail 61 rotates on the circular support bases 62. Two brackets 63 are fixedly connected to the outer walls of two circular support bases 62 respectively, and are used to support the circular support bases 62. Two adjusting blocks 64 are fixedly connected to the bottom of two brackets 63 respectively, and slide within the sliding holes on the spray table 2; A bidirectional screw is rotatably connected in the sliding hole and threadedly connected to two adjusting blocks 64 respectively, for driving the adjusting blocks 64 to move; Motor 265 is installed on the outer wall of the spraying station 2. Its output end is connected to one end of the bidirectional screw to drive the bidirectional screw to rotate.

[0022] The drive mechanism 5 includes: The movable rod 51 is slidably connected to the spray table 2, and the top of the movable rod 51 is fixedly connected to the mounting base 52; The rubber sleeve 53 is rotatably connected to the mounting base 52 via a drive shaft and is used to drive the cylindrical part 1 to rotate. Spring 55 is sleeved on the outer wall of movable rod 51 and is used to push mounting base 52 upward and push rubber sleeve 53 to adhere to the outer wall of cylindrical part 1. Motor 54 is mounted on the outer wall of mounting base 52, and the output end of motor 54 is connected to the drive shaft of rubber tube 53 to drive rubber tube 53 to rotate.

[0023] The spraying angle deflection mechanism 7 includes: Two sliding rods 71 ​​are slidably connected to the inner walls of the fixing rings 42 on both sides; The deflection seat 72 is fixedly connected between the two slide rods 71; A deflection sleeve 77 is installed on the inner wall of the deflection seat 72, and a spray nozzle 78 is installed on the deflection sleeve 77 for spraying coating onto the inner wall of the cylindrical part 1. The conduit 75 is installed on the inner wall of the right slide bar 71 and connected to the deflection sleeve 77 on the side away from the nozzle 78 for conveying paint.

[0024] The spraying angle deflection mechanism 7 also includes: The deflection shaft 76 is fixedly connected to the outer wall of the deflection sleeve 77 and deflects within the deflection seat 72; Gear 79 is fixedly sleeved on the outer wall of deflection shaft 76 and located on the outer wall of deflection seat 72; The push plate 74 is slidably connected to the sliding holes on the two slide rods 71, and a rectangular hole is opened in the push plate 74, and a tooth groove is opened in the rectangular hole, and the tooth groove meshes with the gear 79. Push rod 73 is fixedly connected in the cavity of left slide rod 71, and the output end of push rod 73 is connected to push plate 74 to drive gear 79 to rotate.

[0025] The deflection sleeve 77 is set in a groove on the deflection seat 72 in a corrugated and curved shape.

[0026] Working principle: The cylindrical part 1 to be sprayed is placed above the spraying table 2, between the two clamping mechanisms 4. Then, the motor 65 in the rotating mechanism 6 is started to drive the bidirectional screw to rotate, which drives the two adjusting blocks 64 connected to it to move synchronously towards each other in the sliding hole of the spraying table 2, thereby adjusting the distance between the two supports 63 and the circular support seat 62 on them to accommodate cylindrical parts 1 of different lengths. Subsequently, the two ends of the cylindrical part 1 extend into the clamping mechanisms 4 on both sides respectively, and the drive cylinder 43 is activated to push the U-shaped connecting rod 44. The U-shaped connecting rod 44 drives the arc rod 453 and the cross slide rod 454 connected to it to slide in the cross groove 451. Since the arc rod 453 is hinged to the rotating sleeve 452, and the rotating sleeve 452 is rotatably sleeved on the fixed ring 42, and its four corners are all hinged to a cross slide rod 454 through the arc rod 453, the movement of the U-shaped connecting rod 44 will drive the rotating sleeve 452 to rotate around the fixed ring 42, and then drive the four cross slide rods 454 to slide in their respective cross grooves 451 towards the center of the disk 41 through the four arc rods 453. At this time, the two arc-shaped pressure rods 456 rotatably connected to the pin at the end of each cross slide rod 454 retract inward. Under the push of the spring 458, the spring is connected between the fixed plate 455 and the contact plate 457. The arc-shaped inner side of the arc-shaped pressure rod 456 adaptively and tightly fits the outer circumferential surface of the cylindrical part 1, applying force evenly from four directions to complete the centering and stable clamping of the part. Furthermore, after clamping is completed, under the elastic force of spring 55, the mounting base 52 at the top of the movable rod 51 is pushed upward, so that the rubber cylinder 53 on the mounting base 52 is pressed against the outer wall of the cylindrical part 1. The motor 54 is started to drive the rubber cylinder 53 to rotate. Through the friction between the rubber cylinder 53 and the outer wall of the cylindrical part 1, the entire clamped cylindrical part 1 is driven to rotate at a constant speed around its own axis. The rotational motion is transmitted to the circular rail 61 on its outer edge through the discs 41 on both sides. The circular rail 61 then runs stably on the circular support base 62. Furthermore, the spraying operation begins. Plasma spraying material, such as powder, is conveyed through conduit 75 to the spraying angle deflection mechanism 7. The entire spraying mechanism can slide axially within the fixed ring 42 via slide bar 71 to adjust the depth of the nozzle 78 entering the inner hole of the part. Push rod 73 located in the cavity of left slide bar 71 is activated, pushing push plate 74 to move along the sliding hole on slide bar 71. The toothed groove on the rectangular hole inside push plate 74 meshes with gear 79, thus driving gear 79 to rotate. Since gear 79 is fixedly installed on deflection shaft 76, and deflection shaft 76 is fixedly connected to deflection sleeve 77 which is corrugated, and nozzle 78 is installed at the end of deflection sleeve 77, the rotation of gear 79 can drive deflection shaft 76 and deflection sleeve 77 to deflect within deflection seat 72, thereby changing the spraying direction of nozzle 78, that is, the angle between the spraying axis and the axis of the part, to adapt to the arc-shaped inner wall of the cylindrical part 1 for spraying.

[0027] During the spraying process, the cylindrical part 1 rotates continuously at a constant speed under the drive mechanism 5, ensuring circumferential coverage of its inner wall. At the same time, the nozzle 78 reciprocates under the drive of the spraying angle deflection mechanism 7, changing the radial projection position of the plasma jet in the inner hole, thereby covering different axial areas of the inner wall.

[0028] This invention provides an internal hole plasma spraying device with off-angle spraying function. There are many methods and approaches to implement this technical solution; the above description is merely a preferred embodiment of the invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the invention, and these improvements and modifications should also be considered within the scope of protection of this invention. All components not explicitly stated in this embodiment can be implemented using existing technology.

Claims

1. An internal hole plasma spraying device with off-angle spraying function, comprising a spraying station (2), characterized in that, Also includes: A cylindrical part (1) is set above the spraying station (2) and is used to spray the inner wall of the cylindrical part (1); The operating frame (3) is located below the spraying station (2) and is used to support the spraying station (2). Two clamping mechanisms (4) are set above the spraying station (2) for clamping cylindrical parts (1). The drive mechanism (5) is located above the spraying station (2) and is used to drive the cylindrical part (1) to rotate. A rotating mechanism (6) is located above the spraying station (2) to support the clamping mechanism (4) and to rotate the cylindrical part (1); The spraying angle deflection mechanism (7) is set at the axis of the two clamping mechanisms (4) and is used to spray the inside of the cylindrical part (1). The clamping mechanism (4) includes: A disc (41) is disposed on one side of the cylindrical part (1); A retaining ring (42) is fixedly connected to the axis of the disc (41); Multiple clamping components (45) are disposed on a disc (41) for clamping cylindrical parts (1). A drive cylinder (43) is fixedly connected to a disc (41) and connected to a clamping assembly (45) via a U-shaped connecting rod (44) for driving the clamping assembly (45).

2. The internal hole plasma spraying device with off-angle spraying function according to claim 1, characterized in that: The clamping assembly (45) includes: Multiple cross grooves (451) are equidistantly spaced on the disc (41) and a cross slide rod (454) is slidably connected to the inner wall of each cross groove (451). The rotating sleeve (452) is rotatably connected to the outer wall of the fixed ring (42), and the rotating sleeve (452) is rectangular, with its four corners hinged to the cross slide rod (454) through the arc rod (453); The U-shaped link (44) is connected to the hinge of one of the arc-shaped rods (453) and the cross slide (454) to push the cross slide (454) to move.

3. The internal hole plasma spraying device with off-angle spraying function according to claim 2, characterized in that: The clamping assembly (45) further includes: Multiple arc-shaped pressure rods (456) are rotatably connected in pairs to the pin at the end of the cross slide rod (454) away from the arc-shaped rod (453), and the inner side of the arc is attached to the outer wall of the cylindrical part (1) for clamping the cylindrical part (1). The fixing plate (455) is fixedly connected to the outer wall of the cross slide bar (454) and located on the outside of the arc-shaped pressure bar (456); Multiple contact plates (457) are fixedly connected to the outer wall of the arc-shaped pressure bar (456) at the rotation point away from the arc-shaped pressure bar (456); Multiple springs (458) are fixedly connected between the fixed plate (455) and the abutment plate (457) to push the abutment plate (457) against the arc-shaped pressure bar (456) to fit against the outer wall of the cylindrical part (1).

4. The internal hole plasma spraying device with off-angle spraying function according to claim 3, characterized in that: The rotating mechanism (6) includes: Two circular rails (61) are fixedly connected to the outer walls of the discs (41) on both sides; Two circular support bases (62) are set above the spraying station (2), and a circular rail (61) rotates on the circular support bases (62); Two brackets (63) are fixedly connected to the outer walls of two circular support bases (62) respectively, for supporting the circular support bases (62). Two adjusting blocks (64) are fixedly connected to the bottom of two brackets (63) respectively, and slide in the sliding holes on the spray table (2); A bidirectional screw is rotatably connected in the sliding hole and threadedly connected to two adjusting blocks (64) respectively, for driving the adjusting blocks (64) to move; Motor 2 (65) is installed on the outer wall of the spraying station (2), and its output end is connected to one end of the bidirectional screw to drive the bidirectional screw to rotate.

5. An internal hole plasma spraying device with off-angle spraying function according to claim 4, characterized in that: The drive mechanism (5) includes: The movable rod (51) is slidably connected to the spray table (2), and the top of the movable rod (51) is fixedly connected to the mounting base (52). The rubber tube (53) is rotatably connected to the mounting base (52) via a drive shaft and is used to drive the cylindrical part (1) to rotate; Spring 2 (55) is sleeved on the outer wall of the movable rod (51) and is used to push the mounting base (52) to move upward and push the rubber cylinder (53) to adhere to the outer wall of the cylindrical part (1); Motor 1 (54) is installed on the outer wall of the mounting base (52), and the output end of motor 1 (54) is connected to the drive shaft of the rubber tube (53) to drive the rubber tube (53) to rotate.

6. The internal hole plasma spraying device with off-angle spraying function according to claim 5, characterized in that: The spraying angle deflection mechanism (7) includes: Two sliding rods (71) are slidably connected to the inner walls of the fixing rings (42) on both sides; The deflection seat (72) is fixedly connected between the two slide rods (71); A deflection sleeve (77) is installed on the inner wall of the deflection seat (72), and a nozzle (78) is installed on the deflection sleeve (77) for spraying the inner wall of the cylindrical part (1); The conduit (75) is installed on the inner wall of the right slide bar (71) and connected to the deflection sleeve (77) on the side away from the nozzle (78) for conveying paint.

7. An internal hole plasma spraying device with off-angle spraying function according to claim 6, characterized in that: The spraying angle deflection mechanism (7) also includes: The deflection shaft (76) is fixedly connected to the outer wall of the deflection sleeve (77) and deflects within the deflection seat (72); The gear (79) is fixedly sleeved on the outer wall of the deflection shaft (76) and located on the outer wall of the deflection seat (72); The push plate (74) is slidably connected to the sliding holes on the two slide rods (71), and a rectangular hole is provided in the push plate (74), and a tooth groove is provided in the rectangular hole, and the tooth groove meshes with the gear (79); The push rod (73) is fixedly connected in the cavity of the left slide rod (71), and the output end of the push rod (73) is connected to the push plate (74) to drive the gear (79) to rotate.

8. An internal hole plasma spraying device with off-angle spraying function according to claim 7, characterized in that: The deflection sleeve (77) is arranged in a corrugated shape in a groove on the deflection seat (72).

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