Equipment and process for plasma spray welding metal coating on ball valve surface

Abstract

The present invention discloses an apparatus and process for plasma spray welding a metal coating on the surface of a ball valve, and relates to the technical field of ball valve processing. The apparatus comprises a base, a slide, a lifting platform, a clamping assembly, a guide rail mechanism, a slide, a first telescopic bracket, a second telescopic bracket and a spray gun rod, wherein two slides are symmetrically slidably arranged on the base, a lifting platform is arranged on the slide, a clamping assembly is arranged on the lifting platform, the guide rail mechanism is fixedly arranged at the center of the base, the slide is slidably arranged above the guide rail mechanism, the first telescopic bracket is fixedly arranged on the slide, the second telescopic bracket is vertically fixedly arranged at the output end of the first telescopic bracket, the spray gun rod is fixedly installed on the second telescopic bracket, the guide rail mechanism comprises a fixed platform, a slider, a hydraulic telescopic rod, a guide block, a sleeve gasket and a connecting block; the present invention can greatly reduce the time and cost of changing models, effectively expand its scope of application, and further improve the spray welding efficiency of the ball valve.

Description

Technical Field

[0001] The invention relates to the technical field of ball valve processing, in particular to equipment and technology for plasma spray welding metal coating on the surface of a ball valve. Background Art

[0002] "Ball valve spray welding" refers to the application of spray welding technology on ball valves. A layer of high-performance alloy material (such as nickel-based alloys, cobalt-based alloys, tungsten carbide composite materials, etc.) is sprayed on the sealing surface of the ball and valve seat to improve its surface hardness, wear resistance, corrosion resistance and sealing performance. It is a manufacturing or repair technology. Spray welding is a type of thermal spraying technology, but unlike ordinary spraying, spray welding (especially flame spray welding and certain plasma spray welding) can achieve metallurgical bonding or micro-metallurgical bonding, and the coating has high bonding strength, good density and low porosity.

[0003] At present, traditional spray welding equipment mainly relies on manual operation by the operator, which makes the spray welding consistency poor, prone to quality fluctuations, low efficiency and high labor intensity. In addition, since the ball valve is a sphere with a three-dimensional spherical surface, the motion mechanism of the existing equipment only uses a turntable plus a linear slide, which makes it difficult to ensure that the spray gun is always perpendicular to the spray point surface during the entire spherical movement, and it is difficult to maintain a constant spraying distance. For this purpose, an arc track concentric with the ball valve is generally set, and the equipment is slid on this track, and then a telescopic rod is used to control the spray welding distance. However, this fixed track can only spray weld ball valves within a fixed specification range, which makes it highly limited and cannot be adapted to the spray welding of ball valves of various specifications.

[0004] Therefore, it is necessary to provide an apparatus and process for plasma spray welding a metal coating on the surface of a ball valve to solve the problems raised in the above background technology. Summary of the Invention

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: A device for plasma spraying a metal coating on the surface of a ball valve, comprising a base, a slide, a lifting platform, a clamping assembly, a guide rail mechanism, a slide, a first telescopic bracket, a second telescopic bracket and a spray gun rod, wherein two slides are symmetrically slidably arranged on the base, a lifting platform is arranged on the slide, a clamping assembly is arranged on the lifting platform, the guide rail mechanism is fixedly arranged at the center of the base, the slide is slidably arranged above the guide rail mechanism, a first telescopic bracket is fixedly arranged on the slide, a second telescopic bracket is vertically fixedly arranged on the output end of the first telescopic bracket, and the spray gun rod is fixedly installed on the second telescopic bracket.

[0006] Preferably, the guide rail mechanism includes a fixed platform, a slider, a hydraulic telescopic rod, a guide block, a sleeve gasket and a connecting block, wherein the fixed platform is fixedly arranged on the base, a T-shaped slide groove is provided on the fixed platform, a plurality of T-shaped slide blocks are slidably arranged in the slide groove, a hydraulic telescopic rod is fixedly arranged on the slide block, a plurality of the hydraulic telescopic rods are synchronously extended and retracted, a cylindrical guide block is fixedly arranged on the output end of the hydraulic telescopic rod, and two adjacent guide blocks are arranged tangentially, sleeve gaskets are sleeved on the outer sides of the plurality of guide blocks, and a connecting block is rotatably connected between two adjacent guide blocks.

[0007] Preferably, the sliding block located at the middlemost position of the sliding groove is fixedly connected to the fixed platform, and the hydraulic telescopic rod fixedly connected to the sliding block is arranged perpendicular to the base.

[0008] Preferably, a supporting top rod is vertically fixed on the hydraulic telescopic rod, and a spherical block is rotatably provided on the output end of the supporting top rod;

[0009] The base is provided with an annular groove with an arc-shaped cross section, and the spherical block is inserted into the annular groove and slidably arranged along the annular groove.

[0010] Preferably, two side plates are fixedly provided at the bottom of the slide, two driving wheels are rotatably provided in the slide, and the positions of the two driving wheels are fixed and respectively fit the inner side and the outer side of the cushion, and two groups of adjusting wheels are symmetrically slidably provided on the two side plates with the two driving wheels as symmetry axes, and the two adjusting wheels in the same group of adjusting wheels are longitudinally arranged and respectively fit the inner side and the outer side of the cushion;

[0011] The driving wheel and the regulating wheel are both T-shaped and can be clamped above the sleeve pad and the guide block.

[0012] Preferably, the clamping assembly includes support plate one, support plate two, a rotating shaft, a rectangular telescopic support and a clamping mechanism, wherein support plate one and support plate two are both fixedly arranged on the lifting platform, a turntable is rotatably arranged in support plate one, a rectangular telescopic support is fixedly arranged on the turntable, a rotating shaft is rotatably arranged in support plate two, the rotating shaft is fixedly connected to the turntable and driven by a driving motor, and a clamping mechanism is fixedly arranged at the output end of the rectangular telescopic support.

[0013] Preferably, the clamping mechanism includes a clamping plate, a clamping block and a screw, wherein three straight grooves are evenly arranged on the circumference of the clamping plate, a clamping block is slidably arranged in the straight groove, a screw for driving the clamping block to slide is rotatably arranged in the straight groove, and the screw protrudes from the clamping plate and is fixed with a torsion support plate.

[0014] A process for plasma spray welding metal coating on the surface of a ball valve comprises the following steps:

[0015] S1. Adjust the slide of the slide according to the specifications of the ball valve, drive the lifting platform to rise and fall, and the rectangular telescopic support to extend and retract, and adjust the height of the two clamping mechanisms and the distance between them so that the two clamping mechanisms can clamp the ball valve and the clamped ball valve is located in the middle position of the base;

[0016] S2. Driving the plurality of hydraulic telescopic rods to extend and retract according to the specifications of the ball valve and driving the plurality of guide blocks to slide, so that the diameter of the guide rail composed of the plurality of guide blocks is adapted to the ball valve to be processed and clamped;

[0017] S2.1. When the multiple hydraulic telescopic rods are extended or retracted, the radius of the guide rail composed of the multiple guide blocks changes synchronously. Two adjacent guide blocks are rotatably connected by a connecting block so that the two guide blocks always remain tangential to each other, and the length of the guide rail remains unchanged during the diameter change process.

[0018] S2.2. When the multiple hydraulic telescopic rods are extended or retracted, the multiple sliders slide along the slide grooves, and the angles between the multiple hydraulic telescopic rods change synchronously, so that the radius of the guide rail and its sector area change linearly while the total length remains unchanged. At the same time, the sleeve can fill the gap between two adjacent guide blocks during the diameter change process, so that the guide rail remains smooth during the diameter change process;

[0019] S3, driving the first telescopic bracket to extend and retract according to the height of the ball valve clamping, so that the spray gun rod and the ball valve surface are perpendicular, and driving the second telescopic bracket to extend and retract, thereby adjusting the distance between the spray gun rod and the ball valve surface;

[0020] S4, using the drive motor to drive the rotating shaft to rotate and drive the clamping mechanism to rotate, and at the same time using the spray gun rod to spray plasma metal onto the surface of the ball valve;

[0021] S5, after spray welding one circle on the surface of the ball valve, driving the slide to slide along the guide rail mechanism, thereby driving the spray gun rod to rotate along the surface of the ball valve;

[0022] S5.1. When the radius of the guide rail composed of multiple guide blocks changes, the two groups of adjusting wheels in the slide are driven to slide, so that the two groups of adjusting wheels and the driving wheels are always in contact with the sleeve when the guide rail changes, so that when the slide slides, the spray gun rod always remains perpendicular to the surface of the ball valve and the distance between the spray gun rod and the surface of the ball valve remains unchanged.

[0023] Compared with the prior art, the present invention provides an apparatus and process for plasma spray welding a metal coating on a ball valve surface, which has the following beneficial effects:

[0024] The present invention provides a variable diameter guide rail mechanism composed of multiple guide blocks and sleeves and an adaptive slide seat, so that the guide rail radius is accurately matched with the curvature of the ball valve. In the process of the spray gun rod rotating along the surface of the ball valve, the distance from the spray gun rod to the ball valve surface is always kept constant, thereby making the spray welding more uniform and of higher quality, effectively solving the problem of uneven coating caused by changes in the spherical curvature in traditional spray welding, and quickly adapting to ball valves of different diameters without replacing the guide rail mechanism and the clamping assembly, that is, there is no need to replace the tooling, which greatly reduces the changeover time and cost, effectively expands its scope of application, and further improves the spray welding efficiency of the ball valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 It is a structural schematic diagram of the clamping assembly in the present invention;

[0027] Figure 3 Schematic diagram of the structure of the clamping mechanism of the present invention;

[0028] Figure 4 Schematic diagram of the structure of the guide rail mechanism of the present invention;

[0029] Figure 5 for Figure 4 A magnified schematic diagram of the structure of part A in the middle;

[0030] Figure 6 Schematic diagram of the structure of the slide in the present invention;

[0031] Figure 7 Schematic diagram of the diameter-changing implementation structure of the guide rail mechanism in the present invention;

[0032] In the figure: 1. Base; 11. Annular groove; 2. Slide; 3. Lifting platform; 4. Clamping assembly; 41. Support plate 1; 42. Support plate 2; 43. Rotating shaft; 44. Rectangular telescopic support; 45. Clamping mechanism; 451. Clamping disk; 452. Clamping block; 453. Screw; 46. Turntable; 47. Driving motor; 5. Guide rail mechanism; 51. Fixed platform; 511. Slide; 52. Slider; 53. Hydraulic telescopic rod; 531. Supporting top rod; 532. Spherical block; 54. Guide block; 55. Sleeve pad; 56. Connecting block; 6. Slide; 61. Side panel; 62. Driving wheel; 63. Adjusting wheel; 7. First telescopic bracket; 8. Second telescopic bracket; 9. Spray gun rod. DETAILED DESCRIPTION

[0033] See also Figures 1 to 7In an embodiment of the present invention, a device for plasma spraying a metal coating on the surface of a ball valve includes a base 1, a slide 2, a lifting platform 3, a clamping assembly 4, a guide rail mechanism 5, a slide 6, a first telescopic bracket 7, a second telescopic bracket 8 and a spray gun rod 9, wherein two slides 2 are symmetrically slidably arranged on the base 1, the slide 2 is provided with a lifting platform 3, the lifting platform 3 is provided with a clamping assembly 4, the guide rail mechanism 5 is fixedly arranged at the center of the base 1, the slide 6 is slidably arranged above the guide rail mechanism 5, the slide 6 is fixedly provided with a first telescopic bracket 7, the output end of the first telescopic bracket 7 is vertically fixed with a second telescopic bracket 8, and the spray gun rod 9 is fixedly mounted on the second telescopic bracket 8;

[0034] In addition, there are various driving modes for the slide 2 to slide along the base 1, such as a hydraulic drive mechanism, a rack and pinion mechanism, and a worm gear;

[0035] The guide rail mechanism 5 includes a fixed platform 51, a slider 52, a hydraulic telescopic rod 53, a guide block 54, a sleeve gasket 55 and a connecting block 56, wherein the fixed platform 51 is fixedly set on the base 1, and a T-shaped slide groove 511 is opened on the fixed platform 51, and a plurality of T-shaped sliders 52 are slidably set in the slide groove 511, and a hydraulic telescopic rod 53 is fixedly set on the slider 52. The plurality of hydraulic telescopic rods 53 are synchronously extended and retracted. A cylindrical guide block 54 is fixedly set at the output end of the hydraulic telescopic rod 53, and two adjacent guide blocks 54 are arranged tangentially. A sleeve gasket 55 is sleeved on the outer side of the plurality of guide blocks 54, and a connecting block 56 is rotatably connected between two adjacent guide blocks 54;

[0036] It should be noted that the sleeve 55 is made of a hard material with elasticity. That is, when the radius of the guide rail changes, the sleeve 55 can fill the gap between two adjacent guide blocks 54, and can elastically deform while maintaining a certain hardness, thereby ensuring that the guide rail can remain smooth when the radius changes. Since the two adjacent guide blocks 54 always remain tangential when the guide rail changes in radius, the gap between the two adjacent guide blocks 54 changes less, thereby making the deformation of the sleeve 55 smaller, thereby ensuring that the guide rail remains smooth while meeting the requirements of variable diameter adjustment.

[0037] Two side plates 61 are fixedly provided at the bottom of the slide 6. Two driving wheels 62 are rotatably provided in the slide 6. The positions of the two driving wheels 62 are fixed and respectively fit the inner and outer sides of the sleeve 55. Two groups of adjusting wheels 63 are symmetrically provided on the two side plates 61 with the two driving wheels 62 as the symmetry axis. The two adjusting wheels 63 in the same group are longitudinally arranged and respectively fit the inner and outer sides of the sleeve 55.

[0038] In addition, there are various ways to drive the driving wheel 62. For example, two mutually meshing gears are embedded in the slide 6, the two gears are connected to the two driving wheels 62, and a motor is used to drive one of the gears to rotate. The rotation of the two gears drives the two driving wheels 62 to rotate, thereby realizing the sliding of the slide 6 along the guide rail. Alternatively, the two driving wheels 62 are connected by a pulley, and then one of the pulleys is driven to rotate by a motor.

[0039] The driving wheel 62 and the adjusting wheel 63 are both T-shaped and can be clamped on the sleeve 55 and the guide block 54;

[0040] For ease of understanding, the two adjusting wheels 63 of the two groups of adjusting wheels 63 located on the same side of the guide rail and one of the driving wheels 62 can be regarded as three points on the arc, and the two groups of adjusting wheels 63 are symmetrically arranged along the driving wheels 62, that is, a straight line is drawn between the two adjusting wheels 63, and this straight line is parallel to the tangent of the arc at the driving wheels 62. Then the driving wheels 62 are fixed in position, and the two driving wheels 62 are facing the center of the guide rail. Therefore, when the radius of the guide rail changes, the two groups of adjusting wheels 63 are driven to extend and retract at the same time so that they always fit the guide rail, so that the two driving wheels 62 can always face the center of the guide rail. That is, the slide 6 rotates in a circle with the center of the guide rail as the center point during the sliding process along the guide rail, so that the spray gun rod 9 always remains perpendicular to the spraying point during the rotation process along the surface of the ball valve.

[0041] The clamping assembly 4 includes a support plate 1 41, a support plate 2 42, a rotating shaft 43, a rectangular telescopic support 44 and a clamping mechanism 45, wherein the support plate 1 41 and the support plate 2 42 are both fixedly arranged on the lifting platform 3, a turntable 46 is rotatably provided in the support plate 1 41, and a rectangular telescopic support 44 is fixedly provided on the turntable 46, a rotating shaft 43 is rotatably provided in the support plate 2 42, the rotating shaft 43 is fixedly connected to the turntable 46 and driven by a drive motor 47, and a clamping mechanism 45 is fixedly provided at the output end of the rectangular telescopic support 44;

[0042] The clamping mechanism 45 includes a clamping plate 451, a clamping block 452 and a screw 453, wherein the clamping plate 451 is evenly circumferentially provided with three straight grooves, the clamping block 452 is slidably arranged in the straight groove, the screw 453 for driving the clamping block 452 to slide is rotatably arranged in the straight groove, and the screw 453 protrudes from the clamping plate 451 and is fixed with a torsion support plate.

[0043] During implementation, the ball valve is clamped by the clamping assembly 4, and then the driving motor 47 is used to drive the clamping mechanism 45 to rotate, thereby driving the ball valve to rotate. At the same time, the ball valve is spray-welded by the spray gun rod 9, and the slide 6 is driven to slide along the guide rail mechanism 5 with a variable diameter during the spray welding process, thereby driving the spray gun rod 9 to slide along the surface of the ball valve. During the sliding process, the spray gun rod 9 is always perpendicular to the surface of the spraying point, and the distance between the spray gun rod 9 and the surface of the ball valve remains unchanged, thereby making the spraying more uniform and the spraying quality higher. When the clamping assembly 4 clamps the ball valve, the slide 2 can be driven to slide according to the specifications of the ball valve, and the lifting platform 3 can be driven to rise and fall at the same time, so that the height and horizontal positions of the clamping assembly 4 are changed, so as to clamp ball valves of different specifications and ensure that the ball valve is always in the center position of the base 1 after clamping. While adjusting the position of the clamping assembly 4, the multiple hydraulic telescopic rods 53 are driven to extend and retract synchronously, so that the radius of the guide rail composed of multiple guide blocks 54 changes. In this process, Since two adjacent guide blocks 54 are rotatably connected by the connecting block 56, when the hydraulic telescopic rod 53 drives the guide block 54 to slide, the slider 52 will slide in the slide groove 511, and the angle between the two adjacent hydraulic telescopic rods 53 will change, while the total length of the guide rail composed of multiple guide blocks 54 will not change, thereby realizing the diameter adjustment of the guide rail mechanism 5, so that the radius of the guide rail is adapted to the processing of the ball valve. At the same time, when the radius of the guide rail changes, the two sets of adjusting wheels 63 in the slide 6 can be driven to slide, so that the two sets of adjusting wheels 63 always fit the outer side of the sleeve 55 regardless of how the radius of the guide rail changes. That is, regardless of how the radius of the guide rail changes, the slide 6 can always slide along the guide rail, and then drive the two driving wheels 62 to rotate, so that the driving wheels 62 rotate along the surface of the sleeve 55, thereby driving the slide 6 to slide along the guide rail, and further driving the spray gun rod 9 to slide along the surface of the ball valve, thereby realizing the spray welding of ball valves of various specifications with higher spray welding efficiency and better quality.

[0044] For ease of understanding, the guide rail composed of multiple guide blocks 54 can be regarded as an arc. Then, when the length of the arc remains unchanged, the arc radius is inversely proportional to its central angle, and the corresponding arc radius is directly proportional to the sector area. At this time, the extension and contraction of the multiple hydraulic telescopic rods 53 can be regarded as a change in the radius of the arc. Since the two adjacent guide blocks 54 are rotatably connected by the connecting block 56, the total length of the guide rail will not change, that is, the arc length remains unchanged. In other words, the extension and contraction of the hydraulic telescopic rod 53 and the guide rail composed of the guide blocks 54 change linearly, thereby realizing the diameter change of the guide rail, and thus adapting to the spray welding of ball valves of various specifications.

[0045] In this embodiment, Figure 1 、 Figure 4 and Figure 5The slider 52 located at the middle position of the slide 511 is fixedly connected to the fixed platform 51, and the hydraulic telescopic rod 53 fixedly connected to the slider 52 is vertically arranged to the base 1;

[0046] A supporting rod 531 is vertically fixed on the hydraulic telescopic rod 53, and a spherical block 532 is rotatably provided on the output end of the supporting rod 531;

[0047] The base 1 is provided with an annular groove 11 with an arc-shaped cross section. The spherical block 532 is inserted into the annular groove 11 and slides along the annular groove 11 .

[0048] In particular, the provision of the supporting top rod 531 can ensure that the hydraulic telescopic rod 53 can remain stable during the process of the slider 52 sliding in the slide groove 511 and driving the hydraulic telescopic rod 53 to rotate along the fixed platform 51, that is, the guide rail composed of multiple guide blocks 54 keeps stable changes, and at the same time, the slider 52 located in the middle position of the slide groove 511 is fixed, so that when the radius of the guide rail changes, the sliding of multiple sliders 52 and the rotation of the hydraulic telescopic rod 53 are symmetrically changed with the slider 52 located in the middle as the symmetry axis, and the initial position of its slide seat 6 is located in the middle position of the guide rail, that is, the placement position of the spray gun rod 9 is perpendicular to the center point of the ball valve and perpendicular to the base 1, which makes it convenient to adjust the initial position of the spray gun rod 9 and the initial radius of the guide rail according to the specifications of the ball valve and the spray welding requirements.

[0049] A process for plasma spray welding metal coating on the surface of a ball valve comprises the following steps:

[0050] S1. Adjust the slide 2 according to the specifications of the ball valve, drive the lifting platform 3 to rise and fall, and the rectangular telescopic support 44 to extend and retract, and adjust the height of the two clamping mechanisms 45 and the distance between them so that the two clamping mechanisms 45 can clamp the ball valve and the clamped ball valve is located in the middle position of the base 1;

[0051] S2. Driving the plurality of hydraulic telescopic rods 53 to extend and retract according to the specifications of the ball valve and driving the plurality of guide blocks 54 to slide, so that the diameter of the guide rail formed by the plurality of guide blocks 54 is adapted to the ball valve to be processed and clamped;

[0052] S2.1. When the multiple hydraulic telescopic rods 53 are extended or retracted, the radius of the guide rail formed by the multiple guide blocks 54 changes synchronously. Adjacent guide blocks 54 are rotatably connected by a connecting block 56 so that the two guide blocks 54 always remain tangential to each other, ensuring that the length of the guide rail remains unchanged during the diameter change process.

[0053] S2.2. When the hydraulic telescopic rods 53 are extended or retracted, the sliders 52 slide along the chute 511, and the angles between the hydraulic telescopic rods 53 change synchronously, so that the radius and the sector area of ​​the guide rail change linearly while the total length remains unchanged. Furthermore, the bushing 55 fills the gap between two adjacent guide blocks 54 during the diameter change process, ensuring that the guide rail remains smooth during the diameter change process.

[0054] S3, driving the first telescopic bracket 7 to extend and retract according to the height of the ball valve clamping, so that the spray gun rod 9 is perpendicular to the ball valve surface, and at the same time driving the second telescopic bracket 8 to extend and retract, thereby adjusting the distance between the spray gun rod 9 and the ball valve surface;

[0055] That is to say, after the ball valve is clamped and the radius of the guide rail mechanism 5 is adjusted, the center point of the ball valve and the center point of the guide rail mechanism 5 are vertically aligned, and the position of the spray gun rod 9 is horizontally aligned with the center point of the ball valve. That is, when the drive motor 47 drives the clamping mechanism 45 and the ball valve to rotate, it can be seen that the spray gun rod 9 rotates along the surface of the ball valve to spray weld the ball valve, and when the slide seat 6 slides and drives the spray gun rod 9 to rotate, it can be seen that the position of the spray gun rod 9 on the surface of the ball valve changes, and the distance between the spray gun rod 9 and the surface of the ball valve remains unchanged during this change.

[0056] S4, using the drive motor 47 to drive the rotating shaft 43 to rotate and drive the clamping mechanism 45 to rotate, while using the spray gun rod 9 to spray plasma metal onto the surface of the ball valve;

[0057] S5, after spray welding one circle on the surface of the ball valve, driving the slide 6 to slide along the guide rail mechanism 5, thereby driving the spray gun rod 9 to rotate along the surface of the ball valve;

[0058] S5.1. When the radius of the guide rail composed of multiple guide blocks 54 changes, the two groups of adjusting wheels 63 in the slide 6 are driven to slide, so that the two groups of adjusting wheels 63 and the driving wheels 62 are always in contact with the sleeve 55 when the guide rail changes, so that when the slide 6 slides, the spray gun rod 9 always remains perpendicular to the surface of the ball valve, and the distance between the spray gun rod 9 and the surface of the ball valve remains unchanged.

[0059] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A device for plasma spray welding metal coating on the surface of a ball valve, characterized in that: The invention comprises a base (1), a slide (2), a lifting platform (3), a clamping assembly (4), a guide rail mechanism (5), a slide seat (6), a first telescopic bracket (7), a second telescopic bracket (8) and a spray gun rod (9), wherein two slides (2) are symmetrically slidably arranged on the base (1), a lifting platform (3) is arranged on the slide (2), a clamping assembly (4) is arranged on the lifting platform (3), the guide rail mechanism (5) is fixedly arranged at the center of the base (1), the slide seat (6) is slidably arranged above the guide rail mechanism (5), a first telescopic bracket (7) is fixedly arranged on the slide seat (6), a second telescopic bracket (8) is vertically fixedly arranged on the output end of the first telescopic bracket (7), and the spray gun rod (9) is fixedly mounted on the second telescopic bracket (8); The guide rail mechanism (5) comprises a fixed platform (51), a slider (52), a hydraulic telescopic rod (53), a guide block (54), a sleeve gasket (55) and a connecting block (56), wherein the fixed platform (51) is fixedly arranged on the base (1), a T-shaped slide groove (511) is provided on the fixed platform (51), a plurality of T-shaped slide blocks (52) are slidably arranged in the slide groove (511), a hydraulic telescopic rod (53) is fixedly arranged on the slide block (52), the plurality of hydraulic telescopic rods (53) are synchronously extended and retracted, a cylindrical guide block (54) is fixedly arranged at the output end of the hydraulic telescopic rod (53), and two adjacent guide blocks (54) are tangentially arranged, sleeve gaskets (55) are sleeved on the outer sides of the plurality of guide blocks (54), and a connecting block (56) is rotatably connected between two adjacent guide blocks (54); The clamping assembly (4) includes a support plate 1 (41), a support plate 2 (42), a rotating shaft (43), a rectangular telescopic support (44) and a clamping mechanism (45), wherein the support plate 1 (41) and the support plate 2 (42) are both fixedly arranged on the lifting platform (3), a turntable (46) is rotatably arranged in the support plate 1 (41), a rectangular telescopic support (44) is fixedly arranged on the turntable (46), a rotating shaft (43) is rotatably arranged in the support plate 2 (42), the rotating shaft (43) is fixedly connected to the turntable (46) and driven by a driving motor (47), and a clamping mechanism (45) is fixedly arranged at the output end of the rectangular telescopic support (44).

2. The device for plasma spray welding a metal coating on a ball valve surface according to claim 1, characterized in that: The slider (52) located at the middle position of the slide groove (511) is fixedly connected to the fixed platform (51), and the hydraulic telescopic rod (53) fixedly connected to the slider (52) is vertically arranged to the base (1).

3. The device for plasma spray welding a metal coating on a ball valve surface according to claim 2, characterized in that: A supporting top rod (531) is vertically fixed on the hydraulic telescopic rod (53), and a spherical block (532) is rotatably provided on the output end of the supporting top rod (531); The base (1) is provided with an annular groove (11) with an arc-shaped cross section, and the spherical block (532) is inserted into the annular groove (11) and is slidably arranged along the annular groove (11).

4. The device for plasma spray welding a metal coating on a ball valve surface according to claim 1, characterized in that: Two side plates (61) are fixedly provided at the bottom of the slide (6), two driving wheels (62) are rotatably provided in the slide (6), and the positions of the two driving wheels (62) are fixed and respectively fit the inner side and the outer side of the sleeve (55), and two groups of adjusting wheels (63) are symmetrically provided on the two side plates (61) with the two driving wheels (62) as the symmetry axis, and the two adjusting wheels (63) in the same group of adjusting wheels (63) are longitudinally provided and respectively fit the inner side and the outer side of the sleeve (55); The driving wheel (62) and the regulating wheel (63) are both T-shaped and can be clamped above the sleeve (55) and the guide block (54).

5. The device for plasma spray welding a metal coating on a ball valve surface according to claim 4, characterized in that: The clamping mechanism (45) includes a clamping disk (451), a clamping block (452) and a screw (453), wherein the clamping disk (451) is evenly provided with three straight grooves in a circumferential manner, a clamping block (452) is slidably arranged in the straight groove, a screw (453) for driving the clamping block (452) to slide is rotatably arranged in the straight groove, and the screw (453) protrudes from the clamping disk (451) and is fixed with a torsion support plate.

6. A process for plasma spraying metal coating on the surface of a ball valve, which uses the equipment for plasma spraying metal coating on the surface of a ball valve as claimed in claim 5, characterized in that: The steps include: S1. Adjust the slide of the slide (2) according to the specifications of the ball valve, drive the lifting platform (3) to rise and fall, and the rectangular telescopic support (44) to extend and retract, and adjust the height of the two clamping mechanisms (45) and the distance between them, so that the two clamping mechanisms (45) can clamp the ball valve, and the clamped ball valve is located in the middle position of the base (1); S2, driving the plurality of hydraulic telescopic rods (53) to extend and retract according to the specifications of the ball valve and driving the plurality of guide blocks (54) to slide, so that the diameter of the guide rail composed of the plurality of guide blocks (54) is adapted to the ball valve to be processed and clamped; S2.

1. When the plurality of hydraulic telescopic rods (53) are extended or retracted, the radius of the guide rail composed of the plurality of guide blocks (54) changes synchronously, and two adjacent guide blocks (54) are rotatably connected via a connecting block (56) so that the two guide blocks (54) always maintain a tangent state, so that the length of the guide rail remains unchanged during the diameter change process; S2.2, when the plurality of hydraulic telescopic rods (53) are extended or retracted, the plurality of sliders (52) will slide along the slide groove (511), and at the same time, the angles between the plurality of hydraulic telescopic rods (53) will change synchronously, so that the radius of the guide rail and its sector area change linearly when the total length remains unchanged, and at the same time, the sleeve (55) can fill the gap between two adjacent guide blocks (54) during the diameter change process, so that the guide rail remains smooth during the diameter change process; S3, driving the first telescopic bracket (7) to extend and retract according to the height of the ball valve clamping, so that the spray gun rod (9) and the surface of the ball valve are in a vertical state, and at the same time driving the second telescopic bracket (8) to extend and retract, thereby adjusting the distance between the spray gun rod (9) and the surface of the ball valve; S4, using the driving motor (47) to drive the rotating shaft (43) to rotate and drive the clamping mechanism (45) to rotate, while using the spray gun rod (9) to spray plasma metal onto the surface of the ball valve; S5, after spray welding one circle on the surface of the ball valve, driving the slide seat (6) to slide along the guide rail mechanism (5), thereby driving the spray gun rod (9) to rotate along the surface of the ball valve; S5.

1. When the radius of the guide rail composed of a plurality of guide blocks (54) changes, the two sets of adjusting wheels (63) in the slide (6) are driven to slide, so that the two sets of adjusting wheels (63) and the driving wheel (62) are always attached to the sleeve (55) when the guide rail changes, so that when the slide (6) slides, the spray gun rod (9) always remains perpendicular to the surface of the ball valve, and the distance between the spray gun rod (9) and the surface of the ball valve remains unchanged.

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