A spraying device and process for a wear-resistant coating on a titanium ball valve ball.

Abstract

This application discloses a spraying device and process for a wear-resistant coating on a titanium ball valve, relating to the field of ball surface spraying. It includes a body, a first rotating arm, a second rotating arm, an inner support assembly, support wheels, a centering assembly, and a plasma spray gun. The first rotating arm is rotatably mounted on the body, and the second rotating arm is slidably mounted on the body. When the second rotating arm slides towards the first rotating arm, it engages with the first rotating arm to form a coaxial rotational fit. The inner support assembly is provided on both the first and second rotating arms, and the support wheel is provided on both the first and second rotating arms. The support wheel is slidably mounted on the two rotating arms, supporting the inner wall of the ball and forming a sliding fit with the ball. The centering assembly includes two synchronously sliding centering plates, and a pre-support portion is provided on the centering plates. This application can prevent the spray gun from producing dry spray, reducing waste.

Description

Technical Field

[0001] This application relates to the field of ball surface spraying, and in particular to a spraying device and process for a wear-resistant coating on a titanium ball valve ball. Background Technology

[0002] The wear-resistant coating and surface treatment of wear-resistant ball valves require the use of hard alloys with sufficient hardness to ensure that the valves can maintain good wear resistance, erosion resistance and sealing performance under high-speed fluid scouring and solid particle impact.

[0003] Furthermore, the ball body experiences the most impacts during ball valve use; therefore, its surface needs to be coated to provide wear and corrosion resistance. (Ball structure reference...) Figure 1 As shown, it includes a body 90, and a through hole 100 is provided inside the body 90.

[0004] Existing sphere-spraying devices, such as the Chinese patent with publication number CN118835191B, involve rotating a main shaft sphere and using a spray gun to spray the sphere. However, as shown in the accompanying drawings, during the sphere's rotation, the through-hole of the sphere passes through the spraying area, meaning the spray gun sprays the inside of the through-hole, resulting in waste. Summary of the Invention

[0005] To avoid the above-mentioned phenomena and reduce waste, this application provides a spraying device and process for a wear-resistant coating on a titanium ball valve ball.

[0006] The technical solution provided in this application for a spraying device and process for a wear-resistant coating on a titanium ball valve body is as follows:

[0007] A spraying device for a wear-resistant coating on a titanium ball valve body includes a body, a first rotating arm, a second rotating arm, an inner support assembly, support wheels, a centering assembly, and a plasma spray gun. The first rotating arm is rotatably mounted on the body, and the second rotating arm is slidably mounted on the body. When the second rotating arm slides towards the first rotating arm, it engages with the first rotating arm to form a coaxial rotational fit. The inner support assembly is provided on both the first and second rotating arms, and the support wheel is provided on both the first and second rotating arms. The support wheel is slidably mounted on the two rotating arms and supports the inner wall of the ball, forming a sliding fit with the ball. The centering assembly includes two synchronously sliding centering plates, and a pre-support portion is provided on the centering plates.

[0008] By adopting the above technical solution, the sphere is hoisted to the first rotating arm, and the through hole of the sphere is fitted onto the first rotating arm. The second rotating arm slides and inserts into the first rotating arm to form a coaxial rotational fit. Then, the support wheel slides and abuts against the inner wall of the sphere, forming a sliding fit. At this time, the sphere can slide along the length of the rotating arm. Then, the two pairs of center plates slide synchronously towards each other. During this process, the center plates cause the sphere to slide and adjust its position, so that the center of the sphere moves to the designated position. At this time, the pre-support part supports the bottom of the sphere. Then, the support wheel disengages from the inner wall of the sphere, and the inner support assembly... The inner wall of the sphere is supported and pressed tightly, generating friction. Then, the centering plate disengages, and the first rotating arm drives the second rotating arm to rotate synchronously, thereby causing the sphere to rotate. The plasma spray gun then sprays the surface of the sphere. The inner wall of the sphere's through-hole is supported by the internal support assembly, ensuring that the sphere's surface remains within the spraying area during rotation, preventing dry spraying and reducing powder waste. Furthermore, the centering assembly centers and positions the sphere, preventing misalignment between the plasma spray gun's trajectory and the sphere's surface trajectory, which would otherwise affect the spraying effect.

[0009] Preferably, the inner support assembly includes a support plate and a first cylinder for driving the support plate to slide. There are at least two support plates. The number of first cylinders is the same as the number of support plates and they correspond one-to-one. The first rotating arm and the second rotating arm each have a mounting part on their sides that are close to each other. The first cylinder is mounted at the mounting part, and the support plate is fixedly mounted on the piston rod end of the first cylinder.

[0010] By adopting the above technical solution, the first drive operates, driving the support plate to move, so that the support plate abuts against the inner wall of the through hole, achieving synchronous rotation of the two.

[0011] Preferably, a second cylinder is also installed on the mounting part, and at least two second cylinders are provided on the same mounting part. The piston rod end of the second cylinder is provided with a mounting plate, and the support wheel is mounted on the mounting plate.

[0012] By adopting the above technical solution, the second cylinder operates, driving the mounting plate to slide, thereby achieving contact between the support wheel and the inner wall of the through hole. The support wheel and the inner wall of the through hole form a rolling fit, meaning that the ball can slide on the support wheel.

[0013] Preferably, the machine body is provided with an arc-shaped plate, and a mounting base is slidably provided on the arc-shaped plate. The plasma spray gun is mounted on the mounting base. The curvature center of the arc-shaped plate is concentric with the center of the sphere. An arc-shaped rack is provided on the arc-shaped plate. A linkage gear is rotatably connected to the mounting base. The linkage gear meshes with the arc-shaped rack. A drive motor for driving the linkage gear to rotate is provided on the mounting base.

[0014] By adopting the above technical solution, during the spraying operation, the drive motor drives the linkage gear to rotate slowly through the reduction gearbox. The linkage gear travels on the arc-shaped rack, realizing the sliding of the mounting base on the arc-shaped plate, that is, realizing the sliding of the plasma spray gun. The movement of the plasma spray gun realizes the spraying operation on the whole body of the sphere.

[0015] Preferably, a bidirectional lead screw is rotatably mounted on the machine body, and the two centering plates are threadedly connected to the two threaded portions of the bidirectional lead screw. The shape of the pre-support portion is adapted to the outer wall shape of the sphere.

[0016] By adopting the above technical solution, the motor drives the bidirectional lead screw to rotate, and the two pairs of center plates move synchronously. When they move towards each other, the sphere can be centered, so that the center of the sphere moves to a position concentric with the curvature center of the arc plate. The pre-support part provides pre-support for the sphere. The shape of the pre-support part is adapted to the outer wall of the sphere, which can improve the stability of the support.

[0017] Preferably, the end of the first rotating arm is provided with a plug-in groove, and the end of the second rotating arm is provided with a square-shaped plug-in block, which is plugged into the plug-in groove.

[0018] By adopting the above technical solution, the coaxial rotation of the two is achieved through the insertion and engagement of the plug and the plug slot.

[0019] Preferably, the support plate has a plurality of receiving grooves, and each receiving groove has a friction plate hinged to it. The support plate has a support spring installed in the receiving groove. One end of the support spring is connected to the inner wall of the receiving groove, and the other end of the support spring is connected to the friction plate. In the initial state, the friction plate is inclined. When the support plate abuts against the inner wall of the through hole, the friction plate overlaps at the opening of the receiving groove.

[0020] By adopting the above technical solution, in the initial state, the friction plate is inclined, and the inclination direction of the friction plate is consistent with the rotation direction of the support plate. When the friction plate and the inner wall of the through hole are pressed together, the friction plate is pressed against the opening of the receiving groove, and the friction plate cannot rotate. The two rotate synchronously, and due to the friction force and the action of the support spring, the friction plate will always have a rotation tendency, that is, a tendency to rotate away from the rotation direction of the support plate, which is the tendency of the friction plate to gradually rotate from the inclined state to the vertical state. During the process of the friction plate moving from the inclined state to the vertical state, the straight distance between the end of the friction plate and the opening of the receiving groove will gradually increase. If the two rotate relative to each other, the end of the friction plate will tend to move closer to the inner wall of the through hole, thereby compensating for the contact force with the inner wall of the through hole. That is, the friction plate can ensure that the two rotate synchronously. Even if there is relative rotation, the friction plate will immediately press together again due to its action, ensuring the continuity of the ball's rotation and preventing the ball's rotation from stopping or jerking, which would affect the uniformity of the spraying.

[0021] Preferably, the support wheel is hollow inside and filled with lubricating oil, the mounting plate is symmetrically provided with support plates, a connecting shaft is fixedly connected between the two support plates, and the support wheel is rotatably connected to the connecting shaft; the surface of the support wheel is provided with oil outlets at intervals, the oil outlets are trapezoidal in shape, and a blocking block is slidably provided on the support wheel at the oil outlet.

[0022] By adopting the above technical solution, during the centering and positioning of the ball, the ball will slide relative to the support wheel, and the support wheel will rotate. During the rotation of the support wheel, when the blocking block moves to the inner wall of the ball, the blocking block slides inward, forming a squeezing force on the lubricating oil in the support wheel. At this time, the lubricating oil inside the support wheel is squeezed out from the oil outlet, forming a lubricating effect on the contact between the support wheel and the ball, thereby helping to improve the smoothness of the ball's centering and movement.

[0023] Preferably, the block is provided protruding from the surface of the support wheel, the support wheel is provided with a rubber diaphragm at the inner port of the oil outlet, the lower end of the block is fixedly connected to the rubber diaphragm, the lower side of the block is provided with an oil inlet, and the outer end wall of the block is provided with an oil outlet communicating with the oil inlet.

[0024] By adopting the above technical solution, during the rotation of the support wheel, when the block comes into contact with the inner wall of the ball, the block is compressed and the rubber diaphragm deforms. At this time, the lubricating oil inside the support wheel is squeezed and enters the oil inlet of the block. When the block separates from the inside of the ball, the block is reset under the action of the rubber diaphragm. During the rotation of the support wheel, the lubricating oil in the oil inlet will gradually flow out from the oil outlet, thus achieving lubrication.

[0025] A spraying process for a wear-resistant coating on a titanium ball valve body, using the aforementioned spraying equipment, includes the following steps:

[0026] S1: Hoist the sphere to be processed, and make the through hole of the sphere fit around the periphery of the first rotating arm;

[0027] S2: The second rotating arm slides and gradually engages with the first rotating arm to form a coaxial rotational fit;

[0028] S3: The inner support components on the first and second rotating arms abut against the inner wall of the sphere's through hole to support and fix the sphere;

[0029] S4: Drive the first rotating arm to rotate, and synchronously drive the second rotating arm to rotate, so as to realize the rotation of the sphere. The plasma spray gun moves slowly along the arc of the sphere to spray the sphere. The spray powder uses rutile nano titanium dioxide powder as the basic component, and adds 5%-45% volume fraction of hard phase to prepare the powder of this component into a spray particle size of 15-45μm.

[0030] S5: Cooling;

[0031] S6: Disassemble the sphere for quality inspection;

[0032] In step S2, when the second rotating arm is inserted into the first rotating arm, the support wheels on the first and second rotating arms abut against the inner wall of the ball's through hole and form a sliding fit. Then, the centering plates, which are set opposite each other, slide towards each other to center the ball and provide pre-support for the ball. Then, step S3 is performed.

[0033] In summary, this application includes at least one of the following beneficial technical effects:

[0034] 1. The sphere is fixed by internal support components, which allows the outer surface of the sphere to be fully sprayed when the sphere rotates, without any dry spraying. Furthermore, by adjusting the position of the sphere by the center plate, the center of the sphere can be made concentric with the curvature center of the arc-shaped movement trajectory of the plasma spray gun, preventing any deviation between the spraying range and the sphere.

[0035] 2. After the second rotating arm is inserted into the first rotating arm, the support wheel first supports the inner wall of the ball. At this time, the ball can slide along the length of the rotating arm. The ball is centered by the synchronous movement of the centering plate. After the centering is completed, the pre-support part supports the ball. At this time, the support wheel can be separated from the inner wall of the ball. Then the support plate moves to press against the inner wall of the ball to achieve clamping of the ball.

[0036] 3. With the friction plate set on the support plate, the friction plate always has a tendency to rotate when it drives the ball to rotate. If relative rotation occurs, the friction plate will have a small displacement and the end of the friction plate will move closer to the inner wall of the through hole, thereby compensating for the friction force and quickly achieving the tightness between the friction plate and the inner wall of the through hole, preventing the ball from stopping or jerking. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the overall structure of a sphere;

[0038] Figure 2 This is a schematic diagram of the overall structure of the spraying device according to Embodiment 1 of this application;

[0039] Figure 3 This is a partial structural schematic diagram of an embodiment of the spraying device of this application, mainly illustrating the structure of the internal support component;

[0040] Figure 4 This is a partial structural schematic diagram of an embodiment of the spraying device of this application, mainly showing the structure of the arc-shaped plate;

[0041] Figure 5 This is a cross-sectional structural diagram of the support plate in Embodiment 2 of the spraying device of this application;

[0042] Figure 6 This is a schematic diagram of the mounting plate and support wheel in Embodiment 3 of the spraying device of this application;

[0043] Figure 7 This is a cross-sectional view of the support wheel in Embodiment 3 of the spraying device of this application;

[0044] Figure 8 This is a cross-sectional view of the support wheel in Embodiment 4 of the spraying device of this application;

[0045] Figure 9 This is a cross-sectional view of the clogging block in Embodiment 4 of the spraying device of this application.

[0046] Reference numerals: 1. Body; 11. Plasma spray gun; 12. Bidirectional lead screw; 2. First rotating arm; 21. Insertion slot; 3. Second rotating arm; 31. Insertion block; 4. Internal support assembly; 41. Support plate; 411. Friction pad; 412. Receiving groove; 413. Rotating shaft; 414. Friction plate; 415. Support spring; 42. First cylinder; 5. Support wheel; 51. Oil outlet; 52. Blocking block; 521. Connecting rod; 522. Abutment wheel; 523. Limiting plate; 524. Abutment spring ; 6. Centering component; 61. Centering plate; 611. Pre-support part; 7. Support seat; 8. Mounting part; 9. Second cylinder; 91. Mounting plate; 911. Support plate; 912. Connecting shaft; 20. Arc plate; 201. Sliding groove; 202. Arc rack; 30. Mounting seat; 301. Linkage gear; 302. Drive motor; 40. Linkage wheel; 401. Recessed part; 50. Rubber diaphragm; 60. Oil inlet; 70. Oil outlet; 80. Oil delivery channel; 90. Body; 100. Through hole. Detailed Implementation

[0047] The following is in conjunction with the appendix Figure 2 - Appendix Figure 9 This application will be described in further detail.

[0048] This application discloses a spraying device for a wear-resistant coating on a titanium ball valve ball.

[0049] Example 1

[0050] Reference Figure 2The spraying device for the wear-resistant coating of titanium ball valve ball includes a body 1, a first rotating arm 2, a second rotating arm 3, an inner support assembly 4, a support wheel 5, a centering assembly 6, and a plasma spray gun 11. The first rotating arm 2 is rotatably mounted on the body 1 and is driven to rotate by the spindle box. A support seat 7 is slidably connected to the body 1 and is driven to slide by a screw drive. The second rotating arm 3 is rotatably connected to the support seat 7. When the support seat 7 slides towards the first rotating arm 2, the second rotating arm 3 and the first rotating arm 2 are inserted into each other and rotate coaxially. Both the first rotating arm 2 and the second rotating arm 3 are provided with an inner support assembly 4, which supports the inner wall of the ball and rotates synchronously with the ball. Both the first rotating arm 2 and the second rotating arm 3 are provided with a support wheel 5. When the support wheel 5 abuts against the inner wall of the ball's through hole, the ball and the support wheel 5 form a sliding fit.

[0051] The centering assembly 6 includes two opposing centering plates 61, with a pre-support portion 611 formed on the centering plate 61. A bidirectional lead screw 12 is rotatably connected to the body 1. The two opposing threaded portions of the two centering plates 61 and the bidirectional lead screw 12 correspond one-to-one, and the corresponding threaded portions of the centering plates 61 and the bidirectional lead screw 12 are threadedly connected. The bidirectional lead screw 12 is driven to rotate by a motor. The shape of the pre-support portion 611 is adapted to the shape of the outer wall of the sphere.

[0052] In this application, the titanium ball valve has a large ball volume. First, the ball is hoisted to the work position, so that its central through hole forms a clearance fit with the first rotating arm 2. Then, the second rotating arm 3 moves axially and completes a coaxial connection with the first rotating arm 2. At this time, the support wheel 5 extends radially and contacts the inner wall of the ball, forming a temporary support that can slide axially. The two pairs of middle plates 61 move synchronously towards each other, pushing the ball to move axially along the rotating arm to the preset position. At the same time, the pre-support part 611 provides pre-support for the bottom of the ball. After positioning is completed, the support wheel 5 retracts, and the inner support assembly 4 unfolds and fits tightly against the inner wall of the ball's through hole. The first rotating arm 2 and the second rotating arm 3 drive the ball to rotate synchronously, and the plasma spray gun 11 then uniformly sprays the ball surface. The inner wall of the sphere's through hole is supported by the inner support component 4. When the sphere rotates, the surface of the sphere is always within the spraying area, and there will be no dry spraying, which reduces the waste of spraying powder. Furthermore, the sphere is centered and positioned by the centering component 6, which can prevent the spraying trajectory of the plasma spray gun 11 from not corresponding to the trajectory of the sphere surface due to position deviation, thereby affecting the spraying effect.

[0053] Reference Figure 2 and Figure 3 The first rotating arm 2 has a plug groove 21 at its end, and the second rotating arm 3 has a square-shaped plug block 31 integrally formed at its end. The plug block 31 is plugged into the plug groove 21 to achieve coaxial rotation of the first rotating arm 2 and the second rotating arm 3.

[0054] The inner support assembly 4 includes a support plate 41 and a first cylinder 42 for driving the support plate 41 to slide. At least two support plates 41 are provided; this application uses three as an example. The number of first cylinders 42 is the same as the number of support plates 41 and they correspond one-to-one. Mounting portions 8 are formed on the sides of the first rotating arm 2 and the second rotating arm 3 that are close to each other. The cross-section of the mounting portion 8 is an isosceles triangle. The three first cylinders 42 are respectively mounted on the three surfaces of the mounting portions 8. The support plate 41 is fixedly mounted on the piston rod end of the first cylinder 42. The three support plates 41 are arranged in an array along the circumference. A friction pad 411, made of rubber, is mounted on the support plate 41. When the first cylinder 42 operates, it causes the support plate 41 to press against the inner wall of the through hole. The friction pad 411 increases the static friction between the support plate 41 and the inner wall of the through hole, thereby allowing the ball to rotate synchronously with the support plate 41 when the rotating arm rotates.

[0055] The mounting part 8 is also equipped with a second cylinder 9. At least two second cylinders 9 are provided; this application uses three as an example. The three second cylinders 9 are respectively mounted on three surfaces of the mounting part 8. The number of support wheels 5 is the same as the number of second cylinders 9 and they correspond one-to-one. A mounting plate 91 is fixedly mounted on the end of the piston rod of the second cylinder 9, and the support wheels 5 are mounted on the mounting plate 91. When the second cylinder 9 operates, it drives the mounting plate 91 to move, thereby achieving contact between the support wheels 5 and the inner wall of the through hole.

[0056] Reference Figure 2 and Figure 4 An arc-shaped plate 20 is mounted on the body 1. The curvature center of the arc-shaped plate 20 is concentric with the center of the sphere. A sliding groove 201 is provided on the arc-shaped plate 20. A mounting base 30 slides in the sliding groove 201. The plasma spray gun 11 is mounted on the mounting base 30. An arc-shaped rack 202 is also provided on the arc-shaped plate 20. A linkage gear 301 is rotatably connected to the mounting base 30. The linkage gear 301 meshes with the arc-shaped rack 202. A drive motor 302 is mounted on the mounting base 30. The drive motor 302 drives the linkage gear 301 to rotate through a reduction gearbox.

[0057] During the spraying process, the drive motor 302 transmits power to the linkage gear 301 through the reduction gearbox, causing it to move at a constant speed along the arc-shaped rack 202. This enables the mounting base 30 to move smoothly on the arc-shaped plate 20, allowing the plasma spray gun 11 to cover the trajectory along the meridian of the sphere at a constant spraying distance.

[0058] The implementation principle of the spraying device for the wear-resistant coating of a titanium ball valve ball in this application embodiment is as follows: The ball is sleeved on the first rotating arm 2, and then the second rotating arm 3 is inserted and engaged with the first rotating arm 2. Then, the second cylinder 9 drives the support wheel 5 to abut against the inner wall of the ball's through hole. At this time, the ball can slide along the length direction of the rotating arm, and the two pairs of middle plates 61 slide towards each other to position the ball, so that the center of the ball is concentric with the curvature center of the arc plate 20. When the positioning is finished, the pre-support part 611 supports the bottom of the ball. At this time, the second cylinder 9 drives the support wheel 5 to disengage from the inner wall of the through hole, and the first cylinder 42 drives the support plate 41 to abut against the inner wall of the through hole, realizing the synchronous rotation of the ball and the rotating arm. The plasma spray gun 11 slides on the arc plate 20, and in conjunction with the rotation of the ball, the spraying operation on the surface of the ball can be realized. The plasma spray gun 11 will not have a dry spray phenomenon, reducing the waste of spraying powder.

[0059] Example 2

[0060] Reference Figure 5 The difference between this embodiment and embodiment 1 is that the support plate 41 does not have a friction pad 411, but has several receiving grooves 412. A rotating shaft 413 is fixedly connected inside the support plate 41, and a friction plate 414 is hinged to the rotating shaft 413. A support spring 415 is provided inside the receiving groove 412 of the support plate 41. One end of the support spring 415 is connected to the inner wall of the receiving groove 412, and the other end is connected to the friction plate 414. In the initial state, the friction plate 414 is inclined. When the support plate 41 is pressed against the inner wall of the through hole, the end of the friction plate 414 overlaps the groove opening of the receiving groove 412.

[0061] Initially, the inclination direction of the friction plate 414 is consistent with the rotation direction of the support plate 41. When the friction plate 414 abuts against the inner wall of the through hole, the friction plate 414 overlaps at the opening of the receiving groove 412 and cannot rotate. The two form static friction and rotate synchronously. During the rotation, the friction plate 414 always tends to rotate away from the rotation direction of the support plate 41, that is, the friction plate 414 tends to change from an inclined state to a vertical state. If the friction plate 414 changes from an inclined state to a vertical state, the end of the friction plate 414 and the receiving groove 412 will rotate in opposite directions. The straight-line distance of the groove 412 opening is increased; if the friction plate 414 and the inner wall of the through hole rotate relative to each other due to wear or other unexpected situations, the friction plate 414 will rotate slightly along its trend, increasing the clamping force with the inner wall of the through hole, thereby ensuring the synchronous rotation of the two. That is, the setting of the friction plate 414 in this application can ensure that the two always rotate synchronously. Even if there is relative rotation, the friction plate 414 will immediately clamp again, ensuring the continuity of the ball's rotation and preventing the ball's rotation from stopping or jerking, which would affect the uniformity of the spraying.

[0062] Example 3

[0063] Reference Figure 6 and Figure 7 The difference between this embodiment and embodiment 1 is that the interior of the support wheel 5 is hollow and filled with lubricating oil. Support plates 911 are symmetrically installed on the mounting plate 91, and a connecting shaft 912 is fixedly installed between the two support plates 911. The support wheel 5 is rotatably connected to the connecting shaft 912. Multiple oil outlets 51 are spaced apart on the surface of the support wheel 5. A blocking block 52 is slidably installed at the oil outlet 51. The oil outlet 51 is trapezoidal in shape, and the blocking block 52 is adapted to the shape of the oil outlet 51.

[0064] A linkage wheel 40 is coaxially fixed on the connecting shaft 912. A recess 401 is formed on the linkage wheel 40. A connecting rod 521 is fixedly connected to the inner side of the blocking block 52. An abutment wheel 522 is rotatably connected to the end of the connecting rod 521. The abutment wheel 522 abuts against the surface of the linkage wheel 40. A limiting plate 523 is provided on the connecting rod 521. An abutment spring 524 is also sleeved on the connecting rod 521. One end of the abutment spring 524 is connected to the limiting plate 523, and the other end is connected to the inner port peripheral wall of the oil outlet 51.

[0065] The support wheel 5 rotates relative to the linkage wheel 40. When the abutment wheel 522 moves to the recess 401 of the linkage wheel 40, the blocking block 52 slides inward under the action of the abutment spring 524, forming a squeezing force on the lubricating oil in the support wheel 5. At this time, the lubricating oil inside the support wheel 5 is squeezed out from the oil outlet 51, forming a lubricating effect on the contact between the support wheel 5 and the ball, thereby helping to improve the smoothness of the ball's centering movement.

[0066] In practice, the end of the connecting shaft 912 is provided with an oil replenishment port, and the connecting shaft 912 is also provided with a connecting port that communicates with the oil replenishment port. The connecting port communicates with the interior of the support wheel 5, and the oil replenishment port is connected to the oil pipe.

[0067] Example 4

[0068] Reference Figure 8 and Figure 9 The difference between this embodiment and embodiment 3 is that the oil outlet 51 is square-shaped, the shape of the plug 52 is adapted to the oil outlet 51, the plug 52 protrudes slightly from the surface of the support wheel 5 so as not to affect the rotation of the support wheel 5, a rubber diaphragm 50 is installed at the inner end of the oil outlet 51, and the lower end of the plug 52 is fixedly connected to the rubber diaphragm 50. The width of the rubber diaphragm 50 is less than the length of the bottom wall of the plug 52. An oil inlet 60 is provided on the lower side of the plug 52, and an oil outlet 70 is provided on the outer end wall of the plug 52. The oil outlet 70 and the oil inlet 60 are connected by an oil delivery channel 80.

[0069] During the rotation of the support wheel 5, when the blocking block 52 contacts the inner wall of the ball, the blocking block 52 is compressed and the rubber diaphragm 50 deforms. At this time, the lubricating oil inside the support wheel 5 is squeezed and enters the oil inlet 60 of the blocking block 52. When the blocking block 52 separates from the inside of the ball, the blocking block 52 is reset under the action of the rubber diaphragm 50. During the rotation of the support wheel 5, the lubricating oil in the oil inlet 60 will gradually flow out from the oil outlet 70 to achieve lubrication.

[0070] This application discloses a spraying process for a wear-resistant coating on a titanium ball valve body, using the spraying apparatus of any of the above embodiments, including the following steps:

[0071] S1: Hoist the sphere to be processed, and make the through hole of the sphere fit around the periphery of the first rotating arm 2;

[0072] S2: The second rotating arm 3 slides and gradually engages with the first rotating arm 2 to form a coaxial rotational fit;

[0073] S3: The inner support assembly 4 on the first rotating arm 2 and the second rotating arm 3 abuts against the inner wall of the ball through hole to support and fix the ball;

[0074] S4: Drive the first rotating arm 2 to rotate, and synchronously drive the second rotating arm 3 to rotate, so as to realize the rotation of the sphere. The plasma spray gun 11 moves slowly along the arc of the sphere to spray the circumference of the sphere. The spray powder uses rutile nano titanium oxide powder as the basic component, and adds 5%-45% volume fraction of hard phase to prepare the powder of this component into a spray particle size of 15-45μm.

[0075] S5: Cooling;

[0076] S6: Disassemble the sphere for quality inspection;

[0077] In step S2, when the second rotating arm 3 is inserted into the first rotating arm 2, the support wheel 5 on the first rotating arm 2 and the second rotating arm 3 abuts against the inner wall of the ball through hole and forms a sliding fit. Then, the centering plate 61, which is set opposite to each other, slides towards each other to center the position of the ball and provides pre-support for the ball. Then, step S3 is performed.

[0078] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A spraying device for a wear-resistant coating on a titanium ball valve ball, characterized in that: The assembly includes a body (1), a first rotating arm (2), a second rotating arm (3), an inner support assembly (4), a support wheel (5), a centering assembly (6), and a plasma spray gun (11). The first rotating arm (2) is rotatably mounted on the body (1), and the second rotating arm (3) is slidably mounted on the body (1). When the second rotating arm (3) slides towards the first rotating arm (2), it engages with the first rotating arm (2) to form a coaxial rotational fit. The inner support assembly (4) is provided on both the first rotating arm (2) and the second rotating arm (3). The first rotating arm (2) and the second rotating arm (3) are each provided with a support wheel (5). The support wheel (5) is slidably disposed on the two rotating arms. The support wheel (5) supports the inner wall of the sphere and forms a sliding fit with the sphere. The centering assembly (6) includes two centering plates (61) that are slidably disposed at the same time, and the centering plate (61) is provided with a pre-support part (611). The inner support assembly (4) includes a support plate (41) and a first cylinder (42) that drives the support plate (41) to slide. The support plate (41) to At least two cylinders are provided. The number of first cylinders (42) is the same as the number of support plates (41) and they correspond one-to-one. The first rotating arm (2) and the second rotating arm (3) each have a mounting part (8) on their side that is close to each other. The first cylinder (42) is installed at the mounting part (8). The support plate (41) is fixedly installed at the piston rod end of the first cylinder (42). The support plate (41) has several receiving grooves (412). Each support plate (41) is hinged with a friction plate (414) in the receiving groove (412). The support plate (41) is located in the receiving groove (412) and a support spring (415) is provided. One end of the support spring (415) is connected to the inner wall of the receiving groove (412), and the other end of the support spring (415) is connected to the friction plate (414). In the initial state, the friction plate (414) is inclined and the inclination direction of the friction plate (414) is consistent with the rotation direction of the support plate (41). When the support plate (41) is pressed against the inner wall of the ball through hole, the friction plate (414) overlaps at the groove opening of the receiving groove (412).

2. The spraying device for a wear-resistant coating on a titanium ball valve body according to claim 1, characterized in that: The mounting part (8) is also equipped with a second cylinder (9), and at least two second cylinders (9) are provided on the same mounting part (8). The piston rod end of the second cylinder (9) is provided with a mounting plate (91), and the support wheel (5) is mounted on the mounting plate (91).

3. The spraying device for a wear-resistant coating on a titanium ball valve body according to claim 1, characterized in that: The body (1) is provided with an arc plate (20), and a mounting base (30) is slidably provided on the arc plate (20). The plasma spray gun (11) is provided on the mounting base (30). The curvature center of the arc plate (20) is concentric with the center of the sphere. The arc plate (20) is provided with an arc rack (202). A linkage gear (301) is rotatably connected to the mounting base (30). The linkage gear (301) meshes with the arc rack (202). A drive motor (302) for driving the linkage gear (301) to rotate is provided on the mounting base (30).

4. The spraying device for a wear-resistant coating on a titanium ball valve body according to claim 1, characterized in that: A bidirectional lead screw (12) is rotatably mounted on the body (1), and two centering plates (61) are threadedly connected to the two threaded portions of the bidirectional lead screw (12). The shape of the pre-support portion (611) is adapted to the shape of the outer wall of the sphere.

5. The spraying device for a wear-resistant coating on a titanium ball valve body according to claim 1, characterized in that: The first rotating arm (2) has a plug-in groove (21) at its end, and the second rotating arm (3) has a square plug-in block (31) at its end. The plug-in block (31) is plugged into the plug-in groove (21).

6. The spraying device for a wear-resistant coating on a titanium ball valve body according to claim 2, characterized in that: The support wheel (5) is hollow inside and filled with lubricating oil. The mounting plate (91) is symmetrically provided with support plates (911). A connecting shaft (912) is fixedly connected between the two support plates (911). The support wheel (5) is rotatably connected to the connecting shaft (912). The surface of the support wheel (5) is provided with oil outlets (51) spaced apart. The oil outlets (51) are trapezoidal in shape. A blocking block (52) is slidably provided on the support wheel (5) at the oil outlets (51).

7. The spraying device for a wear-resistant coating on a titanium ball valve body according to claim 6, characterized in that: The blocking block (52) is set on the surface of the support wheel (5). The support wheel (5) is provided with a rubber diaphragm (50) at the inner port of the oil outlet (51). The lower end of the blocking block (52) is fixedly connected to the rubber diaphragm (50). An oil inlet (60) is opened on the lower side of the blocking block (52). An oil outlet (70) communicating with the oil inlet (60) is opened on the outer end wall of the blocking block (52).

8. A spraying process for a wear-resistant coating on a titanium ball valve body, using the spraying apparatus according to any one of claims 1-7, characterized in that: Includes the following steps: S1: Hoist the sphere to be processed and make the through hole of the sphere fit around the first rotating arm (2); S2: The second rotating arm (3) slides and gradually engages with the first rotating arm (2) to form a coaxial rotational fit; S3: The inner support assembly (4) on the first rotating arm (2) and the second rotating arm (3) abuts against the inner wall of the ball through hole to support and fix the ball; S4: Drive the first rotating arm (2) to rotate, and synchronously drive the second rotating arm (3) to rotate, so as to realize the rotation of the sphere. The plasma spray gun (11) moves slowly along the arc of the sphere to spray the sphere. The spray powder uses rutile nano titanium oxide powder as the basic component, and adds 5%-45% volume fraction of hard phase to prepare the powder of this component into a spray particle size of 15-45μm. S5: Cooling; S6: Disassemble the sphere for quality inspection; In step S2, when the second rotating arm (3) is inserted into the first rotating arm (2), the support wheel (5) on the first rotating arm (2) and the second rotating arm (3) abuts against the inner wall of the ball through hole and forms a sliding fit. Then the centering plate (61) is slid towards each other to center the ball and provide pre-support for the ball. Then step S3 is performed.

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