Spraying device and spraying process for ball body of ball valve

Abstract

The ball valve ball spraying device comprises a workbench, a supporting frame and a containing table, a sliding plate is arranged below the containing table, the containing table comprises two fixed baffles and a movable base, the two fixed baffles are located on the two sides of the movable base, the fixed baffles are fixedly installed on the sliding plate, and the movable base is fixedly installed on the workbench. The two balls are placed on the positioning plate, the two ends of each ball abut against the two ends of the corresponding ball through the clamping assembly, the balls are driven by the transmission assembly to rotate, the two ends of each ball are clamped through the clamping assembly, the two ends of each ball abut against the sliding plate, and therefore the two balls can be clamped through the sliding plate, and the two ends of each ball are clamped through the clamping assembly. According to the ball spraying device, the ball is in a closed space, wear-resistant paint is uniformly sprayed on the surface of the ball by the spray head, and then the ball is dried after hot air is introduced into the air inlet pipe, so that spraying processing of the ball is completed.

Description

Technical Field

[0001] The invention discloses a ball valve sphere spraying device and a spraying process, belonging to the technical field of valve accessory processing. Background Art

[0002] Valves are control components in fluid delivery systems, performing functions such as shutoff, regulation, flow diversion, backflow prevention, pressure stabilization, flow diversion, and overflow / pressure relief. Depending on the shape of the valve core, valves can be categorized as ball valves, butterfly valves, and cone valves. A ball valve's opening and closing element is a sphere, driven by a valve stem and rotating around its axis. It is primarily used to shut off or connect media in pipelines and can also be used for fluid regulation and control. The ball, a key component of a ball valve, experiences friction between the ball and the valve seat during opening and closing. Therefore, it is necessary to increase the ball's hardness and spray a wear-resistant coating onto its surface to reduce wear during rotation. Existing spraying devices typically use a fixture to manually clamp the ball, followed by an exposed spray nozzle. This spraying method requires a long wait for the wear-resistant coating to cure, resulting in a long processing cycle. Furthermore, the wear-resistant coating is released into the air as atomized matter during the spraying process, which is detrimental to environmental protection. Summary of the Invention

[0003] The purpose of the present invention is to solve the problems in the prior art and to provide a ball valve ball spraying device and a spraying process.

[0004] The present invention achieves the above-mentioned purpose through the following technical scheme: a ball valve ball spraying device, including a workbench, a support frame and a placement table, a slide plate is provided under the placement table, and the placement table includes a fixed baffle and a movable seat, two fixed baffles are provided, the two fixed baffles are located on both sides of the movable seat, and the fixed baffles are fixedly installed on the slide plate, and limiting bolts are provided on both sides of the movable seat, one end of the limiting bolt passes through the movable seat and is threadedly connected to the slide plate, and a first spring is provided on the outer side of the limiting bolt, which applies an upward force to the movable seat and keeps the upper end of the movable seat higher than the fixed baffle. Trend, the movable seat has two grooves for accommodating the sphere, a positioning plate is provided at the bottom of the groove, and an arc groove for positioning the sphere is provided in the center of the positioning plate, the support frame is installed on the workbench, a baffle is provided above the placement table, the edge of the baffle matches the edge of the placement table, and the baffle is also provided with a spraying assembly and an air intake pipe, the support frame is provided with a cylinder for driving the baffle to rise and fall vertically, clamping assemblies for clamping the sphere are provided on both sides of the placement table, the clamping assemblies are installed on the slide, and the workbench is provided with a driving assembly for driving the slide to slide horizontally.

[0005] Preferably, the clamping assembly includes a power piece, a sliding seat, a rotating shaft, a second spring, a limit block and a pressure sleeve, the sliding seat is slidably arranged on the slide, the middle part of the rotating shaft is rotatably connected to the sliding seat, the second spring and the pressure sleeve are installed on the rotating shaft, the limit block is fixedly connected to one end of the rotating shaft by a bolt, the two ends of the second spring respectively contact the sliding seat and the pressure sleeve, and apply a force to the pressure sleeve to contact the limit block, the power piece is installed on the slide, and is used to drive the two sliding seats to move closer to or away from each other, the baffle cover and the fixed baffle have recesses that cooperate with the pressure sleeve, and the pressure sleeve has a conical surface on the side close to the placement table.

[0006] Preferably, the power part includes a first motor, a first screw and a first guide rod, two fixed plates are provided on the slide, the two ends of the first screw and the second guide rod are rotatably connected to the two fixed plates, the first screw has two sections of threads with opposite rotation directions, the two sliding seats are threadedly connected to the first screw, and the sliding seat is slidably arranged with the first guide rod, the first motor is mounted on the fixed plate, and the output shaft of the first motor is fixedly connected to the first screw.

[0007] Preferably, a transmission assembly for driving the rotating shaft to rotate is provided between the fixed plate and the sliding seat, and the transmission assembly includes a transmission rod, a second motor, a driving pulley, a driven pulley and a belt, two driven pulleys are provided and fixed on the rotating shaft, two ends of the transmission rod are rotatably connected with the two fixed plates, the second motor is mounted on the fixed plate, and the output shaft of the second motor is fixedly connected to the transmission rod, the transmission rod has a limiting portion with a non-circular cross-section, the driving pulley and the limiting portion are slidably arranged, the sliding seat is provided with a block to limit the movement of the driving pulley, and the belt is sleeved on the outside of the driving pulley and the driven pulley.

[0008] Preferably, a flow hole is provided at the center of the positioning plate, and a liquid collecting tank is provided below the movable seat corresponding to the flow hole.

[0009] Preferably, the spray assembly includes a liquid inlet pipe, a connecting pipe and a nozzle. There are multiple nozzles and they are installed on the connecting pipe. One end of the liquid inlet pipe is located outside the baffle, and the other end is connected to the connecting pipe.

[0010] Preferably, the driving assembly includes a third motor, a second screw and a second guide rod, the two ends of the second screw and the second guide rod are rotatably connected to the workbench, the third motor is installed on the side of the workbench, and the output shaft of the third motor is fixedly connected to the second screw, the second screw is threadedly connected to the skateboard, and the second guide rod is slidingly arranged with the skateboard.

[0011] A ball valve ball spraying process comprises the following steps: S1: Place the two spheres on the arc grooves of the two positioning plates, and align the center holes of the spheres with the two rotating shafts. Then, the driving assembly drives the slide and the placement table to move directly under the shield. S2: The power member drives the two sliding seats closer to each other, so that the two rotating shafts drive the pressing sleeves to clamp the two sides of the ball; S3: The cylinder drives the shield to descend, and the shield first contacts the movable seat and causes the movable seat to move downward until the shield contacts the fixed baffle and the movable seat to form a closed space; S4: The liquid inlet pipe delivers the wear-resistant coating to the connecting pipe through an external delivery pump, and then the nozzle sprays it evenly on the surface of the sphere. The transmission assembly drives the rotating shaft to rotate, and the two spheres keep rotating synchronously; S5: After spraying is completed, hot air is introduced into the shield through the air inlet pipe to solidify the wear-resistant coating on the surface of the sphere. The cylinder then drives the shield to reset upward, so that the movable seat drives the positioning plate to support the sphere upward. The transmission assembly then drives the sliding seat and the rotating shaft to reset and release the sphere. Finally, the drive assembly drives the placement table to move to one side, and then the sphere can be removed.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting up a placement table, a positioning plate and a clamping assembly, the center hole of the sphere is placed horizontally in the arc groove of the positioning plate. The arc groove matches the surface of the sphere so that the sphere will not move left and right. The two ends of the sphere are clamped by the clamping assembly, and there is no need for manual clamping and fixing. The operation is simple and convenient.

[0013] 2. By setting up a shield, a spray assembly and a transmission part, when spraying the surface of the sphere, the shield pushes the movable seat downward, so that the clamped sphere is out of contact with the positioning plate. In this way, the sphere is located in a closed space, and the spray assembly sprays the wear-resistant paint on the surface of the sphere. At the same time, the transmission part drives the sphere to rotate, and after the end, the hot air is introduced into the closed space through the air intake pipe. This can effectively shorten the sphere spraying cycle and effectively improve the processing efficiency. In addition, the mist-like wear-resistant paint will not be emitted into the air during the spraying process, effectively ensuring that the production environment of the workshop is not greatly affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural schematic diagram of a ball valve ball spraying device and a spraying process according to the present invention; Figure 2 It is a structural schematic diagram of the clamping assembly and the transmission assembly in the present invention; Figure 3 A cross-sectional view of the present invention showing the blocking cover and the placement table in a state of conflict; Figure 4 It is a structural schematic diagram of the placement table and positioning plate in the present invention; Figure 5 Schematic diagram of the structure of the shield and the spray assembly in the present invention; Figure 6 It is a partial structural diagram of the sliding seat, the transmission rod and the pressing sleeve in the present invention; Reference numerals: 1, workbench; 2, power part; 3, clamping assembly; 4, shield; 5, cylinder; 6, transmission assembly; 7, slide plate; 8, placement table; 9, second screw; 10, second guide rod; 11, sliding seat; 12, limit bolt; 13, first spring; 14, fixed baffle; 15, rotating shaft; 16, driving pulley; 17, first motor; 18, second motor; 19, block; 20, belt; 21, Driven pulley; 22. groove; 23. movable seat; 24. second spring; 25. pressure sleeve; 26. fixed plate; 27. first screw; 28. first guide rod; 29. ​​connecting pipe; 30. liquid inlet pipe; 31. nozzle; 32. positioning plate; 33. liquid collecting tank; 34. flow hole; 35. notch; 36. arc groove; 37. air inlet pipe; 38. transmission rod; 39. limit block; 40. limit part; 41. support frame. DETAILED DESCRIPTION

[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0016] like Figures 1-6As shown, a ball valve ball spraying device includes a workbench 1, a support frame 41 and a placement table 8. A slide plate 7 is provided below the placement table 8, and the placement table 8 includes a fixed baffle 14 and a movable seat 23. Two fixed baffles 14 are provided, and the two fixed baffles 14 are located on both sides of the movable seat 23. The fixed baffles 14 are fixedly installed on the slide plate 7. Limiting bolts 12 are provided on both sides of the movable seat 23. One end of the limiting bolt 12 passes through the movable seat 23 and is threadedly connected to the slide plate 7. A first spring 13 is provided on the outer side of the limiting bolt 12. The first spring 13 applies an upward force to the movable seat 23 and keeps the upper end of the movable seat 23 higher than the fixed baffle 14. Trend, the movable seat 23 has two grooves 22 for accommodating the sphere, a positioning plate 32 is provided at the bottom of the groove 22, and an arc groove 36 for positioning the sphere is provided in the center of the positioning plate 32, and the support frame 41 is installed on the workbench 1, and a baffle 4 is provided above the placement table 8. The edge of the baffle 4 matches the edge of the placement table 8, and the baffle 4 is also provided with a spraying assembly and an air intake pipe 37. The support frame 41 is provided with a cylinder 5 for driving the baffle 4 to rise and fall vertically, and clamping assemblies 3 for clamping the sphere are provided on both sides of the placement table 8. The clamping assembly 3 is installed on the slide 7, and the workbench 1 is provided with a driving assembly for driving the slide 7 to slide horizontally.

[0017] The clamping assembly 3 includes a power piece 2, a sliding seat 11, a rotating shaft 15, a second spring 24, a limit block 39 and a pressure sleeve 25. The sliding seat 11 is slidably arranged on the slide 7. The middle part of the rotating shaft 15 is rotatably connected to the sliding seat 11. The second spring 24 and the pressure sleeve 25 are installed on the rotating shaft. The limit block 39 is fixedly connected to one end of the rotating shaft 15 by a bolt. The two ends of the second spring 24 respectively conflict with the sliding seat 11 and the pressure sleeve 25, and apply a force to the pressure sleeve 25 to conflict with the limit block 39. The power piece 2 is installed on the slide 7 and is used to drive the two sliding seats 11 to move closer to or away from each other. The baffle 4 and the fixed baffle 14 have a recess 35 that cooperates with the pressure sleeve 25. The pressure sleeve 25 is close to the placement table One side of 8 has a conical surface, and the sphere is placed on the positioning plate 32, and the center hole of the sphere is kept aligned with the rotating shaft 15 on both sides of the placement table 8, and then the power piece 2 drives the two sliding seats 11 to approach each other, so that one end of the pressure sleeve 25 slowly extends into the center hole of the sphere. When the two pressure sleeves 25 contact the sphere, the pressure sleeve 25 continues to compress the second spring 24, thereby clamping the sphere, and then the power piece 2 drives the two rotating shafts 15 to rotate at the same time. In order to keep the pressure sleeve 25 and the rotating shaft 15 rotating synchronously, the pressure sleeve 25 and the rotating shaft 15 adopt a sliding setting and limit the rotational freedom of the pressure sleeve 25, so that the rotating shaft 15 can drive the pressure sleeve 25 to rotate synchronously when the rotating shaft 15 rotates, so that the sphere can rotate together.

[0018] The power part 2 includes a first motor 17, a first screw 27 and a first guide rod 28. Two fixed plates 26 are provided on the slide plate 7. The first screw 27 and the two ends of the second guide rod 10 are rotatably connected to the two fixed plates 26. The first screw 27 has two sections of threads with opposite rotation directions. The two sliding seats 11 are threadedly connected to the first screw 27, and the sliding seats 11 are slidably arranged with the first guide rod 28. The first motor 17 is installed on the fixed plate 26, and the output shaft of the first motor 17 is fixedly connected to the first screw 27. When the first motor 17 drives the first screw 27 to rotate, the two sliding seats 11 can be moved closer to or away from each other, so that the rotating shaft 15 maintains synchronous movement, so that the ball can be clamped or loosened.

[0019] A transmission assembly 6 for driving the rotating shaft 15 to rotate is provided between the fixed plate 26 and the sliding seat 11. The transmission assembly 6 includes a transmission rod 38, a second motor 18, a driving pulley 16, a driven pulley 21 and a belt 20. Two driven pulleys 21 are provided and fixed on the rotating shaft 15. Both ends of the transmission rod 38 are rotatably connected with the two fixed plates 26. The second motor 18 is installed on the fixed plate 26, and the output shaft of the second motor 18 is fixedly connected to the transmission rod 38. A limiting portion 40 with a non-circular cross-section is provided on the transmission rod 38. The driving pulley 16 and the limiting portion 40 are slidably arranged. A block 19 is provided on the sliding seat 11 to limit the movement of the driving pulley 16. The belt 20 is sleeved on the outer side of the driving pulley 16 and the driven pulley 21. When the second motor 18 drives the transmission rod 38 to rotate, the two driving pulleys 16 can be driven to rotate, and rely on the belt The belt 20 and the driven pulley 21 drive the rotating shafts 15 on both sides of the placement table 8 to rotate. Since the driven pulley 21 is fixed on the rotating shaft 15, and the active pulley 16 is restricted on the sliding seat 11 by the limit block 39, when the sliding seat 11 slides, the active pulley 16 moves synchronously with the sliding seat 11, so that the active pulley 16 slides on the transmission rod 38, and when the transmission rod 38 rotates, the limit portion 40 cooperates with the active pulley 16, so that the active pulley 16 can keep rotating. In this way, when the position of the active pulley 16 on the transmission rod 38 changes, it does not affect the rotation of the driven pulley 21, thereby driving the ball to rotate after clamping the ball. In this embodiment, the fixed baffle 14 and the movable seat 23 both have through grooves that avoid the transmission rod 38, the first screw 27 and the first guide rod 28.

[0020] A circulation hole 34 is provided at the center of the positioning plate 32, and a liquid collecting tank 33 is provided below the movable seat 23 corresponding to the circulation hole 34. When the wear-resistant paint is sprayed on the sphere, excess liquid paint will drip into the arc groove 36 and flow into the liquid collecting tank 33 along the circulation hole 34. In this way, no accumulation will occur in the arc groove 36, so that when the surface of the sphere is heated and cured, the paint on the surface of the sphere and the arc groove 36 can be quickly cured. In this way, when the sphere is disassembled, the sphere can be prevented from being stained with uncured paint on the surface of the arc groove 36.

[0021] The spraying assembly includes a liquid inlet pipe 30, a connecting pipe 29 and a nozzle 31. There are multiple nozzles 31, which are installed on the connecting pipe 29. One end of the liquid inlet pipe 30 is located on the outside of the baffle 4, and the other end is connected to the connecting pipe 29. The external delivery pump delivers the wear-resistant coating to the connecting pipe 29 through the liquid inlet pipe 30, and then it is sprayed out by the nozzle 31, so that when the sphere rotates, the nozzle 31 can evenly spray the wear-resistant coating on the surface of the sphere.

[0022] The driving assembly includes a third motor, a second screw 9 and a second guide rod 10. Both ends of the second screw 9 and the second guide rod 10 are rotatably connected to the workbench 1. The third motor is installed on the side of the workbench 1, and the output shaft of the third motor is fixedly connected to the second screw 9. The second screw 9 is threadedly connected to the slide 7. The second guide rod 10 is slidingly arranged with the slide 7. The third motor drives the second screw 9 to rotate, so that the slide 7 drives the placement table 8 to slide horizontally along the second guide rod 10, so that it is convenient for workers to place and take out the spheres.

[0023] A ball valve ball spraying process comprises the following steps: S1: Place the two spheres on the arc-shaped grooves 36 of the two positioning plates 32, and align the center holes of the spheres with the two rotating shafts 15. Then, the driving assembly drives the slide 7 and the placement platform 8 to move to the bottom of the shield 4. S2: The power member 2 drives the two sliding seats 11 to move closer to each other, so that the two rotating shafts 15 drive the pressing sleeves 25 to clamp the two sides of the sphere; S3: The cylinder 5 drives the shield 4 to descend. The shield 4 first contacts the movable seat 23 and the movable seat 23 moves downward until the shield 4 contacts the fixed baffle 14 and the movable seat 23 to form a closed space. S4: The liquid inlet pipe 30 delivers the wear-resistant coating to the connecting pipe 29 through an external delivery pump, and then the spray head 31 evenly sprays it on the surface of the sphere. The transmission assembly 6 drives the rotating shaft 15 to rotate, and the two spheres keep rotating synchronously; S5: After the spraying is completed, hot air is introduced into the shield 4 through the air inlet pipe 37, and the wear-resistant coating on the surface of the sphere is solidified. Then the cylinder 5 drives the shield 4 to reset upward, so that the movable seat 23 drives the positioning plate 32 to support the sphere upward. Then the transmission component 6 drives the sliding seat 11 and the rotating shaft 15 to reset and release the sphere. Finally, the driving component drives the placement table 8 to move to one side, and then the sphere can be removed.

[0024] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0025] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A ball valve ball spraying device, comprising a workbench (1), a support frame (41) and a placement table (8), characterized in that: A slide plate (7) is provided below the placement table (8), and the placement table (8) includes a fixed baffle (14) and a movable seat (23), two fixed baffles (14) are provided, and the two fixed baffles (14) are located on both sides of the movable seat (23), and the fixed baffles (14) are fixedly installed on the slide plate (7), and limiting bolts (12) are provided on both sides of the movable seat (23), and one end of the limiting bolt (12) passes through the movable seat (23) and is threadedly connected to the slide plate (7), and a first spring (13) is provided on the outer side of the limiting bolt (12), and the first spring (13) applies an upward force to the movable seat (23) and keeps the upper end of the movable seat (23) higher than the fixed baffle (14), and the movable seat (23) has two springs for accommodating The groove (22) of the sphere is provided with a positioning plate (32) at the bottom of the groove (22), and the center of the positioning plate (32) is provided with an arc groove (36) for positioning the sphere, the support frame (41) is installed on the workbench (1), and a shield (4) is provided above the placement table (8), the edge of the shield (4) matches the edge of the placement table (8), and the shield (4) is also provided with a spraying component and an air intake pipe (37), the support frame (41) is provided with a cylinder (5) for driving the shield (4) to rise and fall vertically, and clamping components (3) for clamping the sphere are provided on both sides of the placement table (8), and the clamping components (3) are installed on the slide (7), and the workbench (1) is provided with a driving component for driving the slide (7) to slide horizontally.

2. A ball valve ball spraying device according to claim 1, characterized in that: The clamping assembly (3) includes a power member (2), a sliding seat (11), a rotating shaft (15), a second spring (24), a limit block (39) and a pressure sleeve (25), wherein the sliding seat (11) is slidably arranged on the slide plate (7), the middle portion of the rotating shaft (15) is rotatably connected to the sliding seat (11), the second spring (24) and the pressure sleeve (25) are mounted on the rotating shaft, the limit block (39) is fixedly connected to one end of the rotating shaft (15) by a bolt, and the The two ends of the second spring (24) respectively contact the sliding seat (11) and the pressing sleeve (25), and apply a force to the pressing sleeve (25) to contact the limit block (39). The power member (2) is installed on the slide (7) and is used to drive the two sliding seats (11) to move closer to or away from each other. The shield (4) and the fixed baffle (14) have a recess (35) that matches the pressing sleeve (25). The pressing sleeve (25) has a conical surface on the side close to the placement table (8).

3. A ball valve ball spraying device according to claim 2, characterized in that: The power member (2) includes a first motor (17), a first screw (27) and a first guide rod (28). Two fixed plates (26) are provided on the slide plate (7). The first screw (27) and the second guide rod (10) are rotatably connected to the two fixed plates (26). The first screw (27) has two sections of threads with opposite rotation directions. The two sliding seats (11) are threadedly connected to the first screw (27), and the sliding seat (11) and the first guide rod (28) are slidably arranged. The first motor (17) is installed on the fixed plate (26), and the output shaft of the first motor (17) is fixedly connected to the first screw (27).

4. A ball valve ball spraying device according to claim 3, characterized in that: A transmission assembly (6) for driving the rotating shaft (15) to rotate is provided between the fixed plate (26) and the sliding seat (11), the transmission assembly (6) comprising a transmission rod (38), a second motor (18), a driving pulley (16), a driven pulley (21) and a belt (20), two driven pulleys (21) are provided and fixed on the rotating shaft (15), two ends of the transmission rod (38) are rotatably connected to the two fixed plates (26), the second motor (18) is mounted on the fixed plate (26), and the output shaft of the second motor (18) is fixedly connected to the transmission rod (38), the transmission rod (38) has a limiting portion (40) with a non-circular cross-section, the driving pulley (16) and the limiting portion (40) are slidably arranged, the sliding seat (11) has a stopper (19) for limiting the movement of the driving pulley (16), and the belt (20) is sleeved on the outer sides of the driving pulley (16) and the driven pulley (21).

5. A ball valve ball spraying device according to claim 4, characterized in that: A circulation hole (34) is provided at the center of the positioning plate (32), and a liquid collecting tank (33) is provided below the movable seat (23) corresponding to the circulation hole (34).

6. A ball valve ball spraying device and spraying process according to claim 5, characterized in that: The spraying assembly comprises a liquid inlet pipe (30), a connecting pipe (29) and a nozzle (31). A plurality of nozzles (31) are provided and are mounted on the connecting pipe (29). One end of the liquid inlet pipe (30) is located outside the baffle (4), and the other end is connected to the connecting pipe (29).

7. A ball valve ball spraying device according to claim 6, characterized in that: The driving assembly includes a third motor, a second screw (9) and a second guide rod (10), both ends of the second screw (9) and the second guide rod (10) are rotatably connected to the workbench (1), the third motor is mounted on the side of the workbench (1), and the output shaft of the third motor is fixedly connected to the second screw (9), the second screw (9) is threadedly connected to the slide (7), and the second guide rod (10) is slidably arranged with the slide (7).

8. A ball valve ball spraying process, using a ball valve ball spraying device as claimed in claim 7, characterized in that: The following steps are involved: S1: Place the two spheres on the arc grooves (36) of the two positioning plates (32), and align the center holes of the spheres with the two rotating shafts (15), and then drive the slide (7) and the placement table (8) to move to the bottom of the shield (4); S2: The power member (2) drives the two sliding seats (11) to approach each other, so that the two rotating shafts (15) drive the pressing sleeves (25) to clamp the two sides of the sphere; S3: The cylinder (5) drives the shield (4) to descend, and the shield (4) first contacts the movable seat (23) and allows the movable seat (23) to move downward until the shield (4) contacts the fixed baffle (14) and the movable seat (23) to form a closed space; S4: The liquid inlet pipe (30) delivers the wear-resistant coating to the connecting pipe (29) through an external delivery pump, and then the spray head (31) evenly sprays it on the surface of the sphere. The transmission component (6) drives the rotating shaft (15) to rotate, and the two spheres keep rotating synchronously; S5: After the spraying is completed, hot air is introduced into the shield (4) through the air inlet pipe (37) to solidify the wear-resistant coating on the surface of the sphere. The cylinder (5) then drives the shield (4) to reset upward, so that the movable seat (23) drives the positioning plate (32) to support the sphere upward. Subsequently, the transmission assembly (6) drives the sliding seat (11) and the rotating shaft (15) to reset and release the sphere. Finally, the driving assembly drives the placement table (8) to move to one side, and then the sphere can be removed.

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