A wheel hub all-round spraying device

Abstract

The present invention belongs to the technical field of wheel hub spraying, and relates to an all-round spraying device for wheel hubs, including a spraying bin, a bracket, a guide rail, a connecting seat, a support shaft and a bearing plate. Four brackets are provided, and a guide rail is connected between the four brackets. Through grooves for the wheel hub to pass through and the guide rail are provided on both sides of the spraying bin. A plurality of connecting seats are evenly spaced and slidably connected to the lower part of the guide rail, and a support shaft is rotatably connected to the connecting seat, and a bearing plate is slidably connected to the upper part of the support shaft. The present invention realizes the spraying of the wheel hub through a spray gun during operation. During the spraying process, the spray gun can be moved up and down by guiding the arc track and cooperating with the electric guide rail, and the spray gun can be flipped toward the wheel hub position for spraying during the up and down movement, so as to realize comprehensive spraying of the wheel hub, and the spraying efficiency is higher, and no manual operation is required, so as to avoid damage to the health of the staff.

Description

Technical Field

[0001] The invention belongs to the technical field of wheel hub spraying and relates to an all-round spraying device for a wheel hub. Background Art

[0002] The wheel hub is an important part of the car, bearing the weight of the whole car and providing support. Its quality is directly related to the driving safety of the car. Aluminum alloy wheels are widely used due to their excellent load-bearing performance. In order to further improve the rust-proof performance of aluminum alloy wheels, it is usually necessary to use a spraying device to spray the surface of the wheel hub to extend its service life.

[0003] At present, some small wheel manufacturers usually place the wheel on a conical rotating support table when spraying car wheels, and then spray manually or use a spray robot. However, during the manual spraying process, the wheel can be flipped up and down at multiple angles to achieve full coverage of the wheel, but a large amount of harmful gases will be generated during the painting process, posing a threat to the health of the operator; when using a spray robot for spraying, due to the limited range of movement of the robot, it is usually necessary to spray one side of the wheel first, then flip the wheel, and then spray the other side. This process is cumbersome and inefficient. Summary of the invention

[0004] In view of this, the present invention provides an all-round spraying device for a wheel hub.

[0005] The technical solution of the present invention is: a wheel hub omnidirectional spraying device, comprising a spraying bin, a bracket, a guide track, a connecting seat, a support shaft, a bearing tray, a spraying mechanism and a rotating mechanism, wherein four brackets are provided, and a guide track is connected between the four brackets, through grooves for the wheel hub to pass through and the guide track are provided on both sides of the spraying bin, a plurality of connecting seats are slidably connected at even intervals at the lower part of the guide track, a supporting shaft for placing the wheel hub is rotatably connected to the connecting seat, a bearing tray for supporting the wheel hub is slidably connected to the upper part of the supporting shaft, a spraying mechanism is provided on the spraying bin, and a rotating mechanism for driving the supporting shaft to rotate is provided between the supporting shaft and the guide track;

[0006] The spraying mechanism includes an electric guide rail, a guide frame, an arc track, a guide shaft, a guide column, a connecting plate, a roller, a ring and a spray gun. Two electric guide rails are installed in the spraying bin, and the movable bodies of the two electric guide rails are connected to guide frames. A guide shaft is movably connected between the two guide frames. Arc tracks are installed on both sides of the spraying bin, and connecting plates are connected on both sides of the guide shaft. The connecting plate is connected with a guide column located in the arc track and a roller that rests against the outer arc surface of the arc track, and the roller is tangent to the outer arc surface of the arc track. A ring is rotatably connected in the middle of the guide shaft, and a spray gun is installed on the ring.

[0007] As a preferred technical solution of the present invention, the edge position of the top of the bearing tray is set in a conical shape to reduce the contact area between the wheel hub and the bearing tray.

[0008] As a preferred technical solution of the present invention, the spraying mechanism also includes a liquid storage tank and an infusion pipe. The liquid storage tank is installed on the spraying bin, and paint liquid is stored in the liquid storage tank. A water pump is installed in the liquid storage tank, and an infusion pipe is connected between the liquid outlet end of the water pump and the spray gun.

[0009] As a preferred technical solution of the present invention, the rotating mechanism includes a servo motor, a driving gear and a transmission gear. The lower part of the support shaft is connected to the transmission gear, the servo motor is installed on the guide rail, and the output shaft of the servo motor is connected to the driving gear. When the support shaft drives the wheel hub to move to the painting position, the transmission gear engages with the driving gear.

[0010] As a preferred technical solution of the present invention, it also includes a driving mechanism, which includes a driving motor, a driving sprocket and a chain, wherein a driving motor is mounted on one of the brackets, a driving sprocket is connected to the output shaft of the driving motor, and chains are connected between the bottoms of multiple connecting seats, and the driving sprocket is meshed with the chain.

[0011] As a preferred technical solution of the present invention, it also includes a blocking ring. A circle of blocking rings is connected to the bottom of the guide track, and the blocking rings block the outside of the chain.

[0012] As a preferred technical solution of the present invention, it also includes a swing mechanism, which includes a cylinder, a connecting rod and a convex shaft. The cylinder is installed on the guide shaft, the telescopic rod of the cylinder is connected to the connecting rod, the connecting rod is connected to the convex shaft, the ring is provided with an inclined groove, and the convex shaft is located in the inclined groove.

[0013] As a preferred technical solution of the present invention, it also includes a limiting mechanism, which includes an expansion airbag, a connecting column, a piston plate and an elastic member. An air storage chamber is opened in the upper part of the support shaft, and the expansion airbag is connected to the support shaft. Air holes that connect the air storage chamber and the expansion airbag are evenly spaced on the upper part of the support shaft. A piston plate is slidably connected in the air storage chamber, and a connecting column is connected to the middle of the bottom of the piston plate. The connecting column passes through the upper part of the support shaft and is connected to the top of the bearing tray. An elastic member is connected between the bearing tray and the support shaft.

[0014] As a preferred technical solution of the present invention, it also includes a gas filtering mechanism, which includes a top frame, a fan and an air filter plate. The top of the spray chamber is connected to the top frame, the bottom of the top frame is connected to the air filter plate, and a plurality of fans are evenly installed on the top frame.

[0015] As a preferred technical solution of the present invention, a liquid accumulation frame is also included. The bottom of the spraying chamber is connected to the liquid accumulation frame for collecting excess paint liquid.

[0016] Beneficial effects: 1. During the operation of the present invention, the spraying of the wheel hub is achieved through a spray gun. During the spraying process, the spray gun can be moved up and down through the guidance of the arc track and the electric guide rail, and in the process of moving up and down, the spray gun can be turned over to spray toward the wheel hub position, so as to achieve comprehensive spraying of the wheel hub. The spraying efficiency is higher, and no manual operation is required, thereby avoiding damage to the health of the staff.

[0017] 2. In the process of spraying, the cylinder drives the convex shaft to reciprocate and extrude the chute, so that the collar and the spray gun can swing back and forth to imitate the effect of manual swing spraying, making the spraying more uniform.

[0018] 3. During the placement of the wheel hub, the present invention can squeeze the gas in the air storage chamber to make the expansion airbag expand and press against the inner wall of the wheel hub, thereby pressing against the inner wall of the wheel hub to fix the wheel hub on the supporting shaft, thereby ensuring the stability of the wheel hub during the spraying process and preventing the wheel hub from slipping on the support tray. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0020] Figure 2 It is a schematic diagram of the three-dimensional structure from another viewing angle of the present invention.

[0021] Figure 3 It is a cross-sectional view of the present invention.

[0022] Figure 4 For the present invention Figure 3 Enlarged view of part A in .

[0023] Figure 5 It is a structural schematic diagram of the spraying mechanism of the present invention.

[0024] Figure 6 It is a cross-sectional view of the spraying mechanism of the present invention.

[0025] Figure 7 It is the right side view of the spraying mechanism of the present invention.

[0026] Figure 8 It is a schematic diagram of the first structure of the swing mechanism of the present invention.

[0027] Fig. 9 It is a second structural schematic diagram of the swing mechanism of the present invention.

[0028] Fig.10 It is a structural schematic diagram of the limiting mechanism of the present invention.

[0029] Fig.11 It is a cross-sectional view of the limiting mechanism of the present invention.

[0030] Fig.12 It is a schematic diagram of the structure of the gas filtering mechanism and the liquid accumulation frame of the present invention.

[0031] Fig.13 It is a schematic structural diagram of the gas filtering mechanism and the liquid accumulation frame after the coating liquid bin of the present invention is cut open.

[0032] The markings in the figure are: 1-spraying chamber, 2-bracket, 3-guide rail, 4-chain, 51-drive motor, 52-drive sprocket, 6-blocking ring, 71-liquid storage tank, 72-spray gun, 73-infusion tube, 74-ring, 81-connecting seat, 82-support shaft, 91-servo motor, 92-drive gear, 93-transmission gear, 101-electric guide rail, 102-guide frame, 103-arc track, 104 -guide shaft, 105-guide column, 106-roller, 107-connecting plate, 111-cylinder, 112-connecting rod, 113-convex shaft, 114-slanted groove, 121-bearing tray, 123-air storage chamber, 124-expansion air bag, 125-connecting column, 126-piston plate, 127-elastic member, 131-top frame, 132-fan, 133-air filter plate, 141-liquid accumulation frame, 100-wheel hub. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the protection scope and application scope of the present invention are not limited.

[0034] A wheel hub all-round spraying device, such as Figure 1-Figure 7As shown, it includes a spraying chamber 1, a bracket 2, a guide rail 3, a connecting seat 81, a support shaft 82, a tray 121, a spraying mechanism and a rotating mechanism. The bracket 2 is provided with four and is symmetrically distributed front and back. The guide rail 3 is connected between the upper parts of the four brackets 2. The left and right sides of the spraying chamber 1 are provided with through grooves for the wheel hub 100 to pass through. The guide rail 3 passes through the through groove position of the spraying chamber 1. The lower part of the guide rail 3 is evenly spaced and slidably connected with a plurality of connecting seats 81. The connecting seat 81 can slide along the guide rail 3. The connecting seat 81 is rotatably connected with a support shaft 82. The support shaft 82 is used to place the wheel hub 100 and align the wheel The hub 100 is supported, and the support shaft 82 is slidably matched with the guide track 3. The upper part of the support shaft 82 is slidably connected with a bearing tray 121 for supporting the hub 100. The edge position of the top of the bearing tray 121 is set in a cone. When the hub 100 is placed on the bearing tray 121, the contact area with the bearing tray 121 can be reduced to avoid excessive contact area between the bearing tray 121 and the hub 100, resulting in a large area that is difficult to spray, thereby ensuring the comprehensiveness of the spraying. A spraying mechanism is provided on the spraying chamber 1, and a rotating mechanism for driving the support shaft 82 to rotate is provided between the support shaft 82 and the guide track 3.

[0035] like Figure 3-Figure 7As shown, the spraying mechanism includes an electric guide rail 101, a guide frame 102, an arc track 103, a guide shaft 104, a guide column 105, a roller 106, a liquid storage tank 71, an infusion tube 73, a collar 74 and a spray gun 72. Two electric guide rails 101 are installed on the rear wall of the spraying chamber 1. The moving bodies of the two electric guide rails 101 are connected to the guide frames 102. A guide shaft 104 is arranged between the two guide frames 102. The guide shaft 104 can slide and rotate in the two guide frames 102. The rear part of the left and right side walls in the spraying chamber 1 is installed with arc tracks 103. The left and right sides of the guide shaft 104 are connected to connecting plates 107. The connecting plate 107 is connected to a guide column 105 and a roller 106. The center of the guide column 105 is consistent with that of the guide shaft 104. The roller 106 rotates with the connecting plate 10 7 is connected, the guide column 105 is located in the arc track 103, the roller 106 is located outside the arc track 103 and abuts against the outer arc surface of the arc track 103, the roller 106 and the outer arc surface of the arc track 103 are tangent, the guide shaft 104 is rotatably connected with a collar 74 in the middle, the collar 74 and the guide shaft 104 rub against each other, and the friction between the collar 74 and the guide shaft 104 prevents the collar 74 from rotating on the guide shaft 104 at will, a spray gun 72 is installed on the collar 74, a liquid storage tank 71 is installed at the rear side of the spraying chamber 1, paint liquid is stored in the liquid storage tank 71, a water pump is installed in the liquid storage tank 71, and a liquid infusion pipe 73 is connected between the liquid outlet end of the water pump and the spray gun 72, so that the water pump can inject paint liquid into the spray gun 72 through the liquid infusion pipe 73 when operating, so that the spray gun 72 sprays paint.

[0036] like Figure 4 As shown, the rotating mechanism includes a servo motor 91, a driving gear 92 and a transmission gear 93. The transmission gear 93 is connected to the lower part of the support shaft 82, and the servo motor 91 is installed at the middle position of the front side of the guide track 3. The driving gear 92 is connected to the output shaft of the servo motor 91. The movement of the support shaft 82 can drive the transmission gear 93 to move to mesh with the driving gear 92. At this time, controlling the operation of the servo motor 91 can drive the transmission gear 93 to rotate.

[0037] like Figure 3 As shown, a driving mechanism is also included, which includes a driving motor 51, a driving sprocket 52 and a chain 4. The driving motor 51 is installed on the bracket 2 on the left rear side, and the driving sprocket 52 is connected to the output shaft of the driving motor 51. The chain 4 is connected between the bottoms of multiple connecting seats 81, and the driving sprocket 52 is meshed with the chain 4 so that the rotation of the driving sprocket 52 can drive the chain 4 to rotate.

[0038] When the wheel hub 100 needs to be sprayed, the present spraying device can be used. When in use, the wheel hub 100 is placed on the support tray 121 of the support shaft 82. When placed, the support tray 121 will move down until the support tray 121 moves down to the limit. At this time, the wheel hub 100 can be supported by the support tray 121 to complete the placement of the wheel hub 100. Then, the driving motor 51 is controlled to drive the driving sprocket 52 to rotate. When the driving sprocket 52 rotates, it can drive the chain 4 to rotate. During the rotation process, the chain 4 can drive the connecting seat 81 along the guide rail. When the connecting seat 81 moves, the supporting shaft 82 can be driven to move together, and the supporting shaft 82 can drive the wheel hub 100 to move when moving, thereby driving the wheel hub 100 to move to the inside of the spray chamber 1 and aligning with the spray gun 72. At this time, the transmission gear 93 on the supporting shaft 82 is meshed with the driving gear 92, and then the servo motor 91 can be controlled to operate to drive the supporting shaft 82 to rotate through the transmission between the driving gear 92 and the transmission gear 93. The rotation of the supporting shaft 82 can drive the wheel hub 100 to rotate, and at the same time control the water pump in the liquid storage tank 71 to extract the stored liquid The paint in the box 71 is sent to the spray gun 72 through the infusion tube 73, and the paint is sprayed by the spray gun 72 to realize the painting work of the wheel hub 100. When painting, the electric guide rail 101 is controlled to drive the guide frame 102 to move up and down. When the guide frame 102 moves, it can drive the spray gun 72 and the collar 74 to move up and down together through the guide shaft 104, and the guide shaft 104 can drive the connecting plate 107 to move during the movement. When the connecting plate 107 moves, it drives the guide column 105 and the roller 106 to move together. The guide column 105 When moving, it will slide along the inside of the arc track 103, and the roller 106 will move along the outer arc surface of the arc track 103, so that the roller 106 is squeezed by the outer arc surface of the arc track 103 and rotates with the center of the guide shaft 104 as the center of the circle, and the roller 106 is always tangent to the outer arc surface of the arc track 103. At this time, the rotation of the roller 106 can drive the connecting plate 107 and the guide shaft 104 to rotate. When the guide shaft 104 rotates, it can drive the spray gun 72 to rotate through the collar 74 to adjust the angle of the spray gun 72 to the wheel hub 100. For details, refer to Figure 7 As shown, the spray gun 72 can be flipped when moving up and down, so that the spray gun 72 is always aimed at the wheel hub 100, so as to facilitate spraying the upper and lower sides of the wheel hub 100. In this way, the wheel hub 100 can be sprayed using the device, and during the spraying process, the wheel hub 100 can be sprayed from top to bottom in all directions. No manual operation is required during spraying, and spraying is more convenient.

[0039] like Figure 2 and Figure 3As shown, a blocking ring 6 is also included. A circle of blocking ring 6 is connected to the bottom of the guide track 3. The blocking ring 6 blocks the outside of the chain 4, thereby limiting the position of the chain 4 and preventing the position of the chain 4 from shifting.

[0040] like Figure 8 and Fig. 9 As shown, it also includes a swing mechanism, which includes a cylinder 111, a connecting rod 112 and a convex shaft 113. The cylinder 111 is installed on the guide shaft 104, and the telescopic rod of the cylinder 111 is connected to the connecting rod 112, and the connecting rod 112 is connected to the convex shaft 113. The ring 74 is provided with an inclined groove 114, and the convex shaft 113 is located in the inclined groove 114. The convex shaft 113 slides in the inclined groove 114 to squeeze the inclined groove 114, thereby driving the ring 74 to swing.

[0041] During the process of spraying paint with the spray gun 72, the telescopic rod of the cylinder 111 can be controlled to repeatedly extend and retract to drive the connecting rod 112 to continuously move left and right. When the connecting rod 112 moves, it can drive the convex shaft 113 to move. When the convex shaft 113 moves, it can squeeze the inclined groove 114, thereby driving the ring 74 to swing repeatedly. When the ring 74 swings, it can drive the spray gun 72 to swing, so that the spray gun 72 can repeatedly swing to spray paint during the process of spraying paint, so as to imitate the effect of a person holding the spray gun 72 in a swinging manner, and the paint liquid can be sprayed on the wheel hub 100 more evenly.

[0042] like Fig.10 and Fig.11 As shown, it also includes a limiting mechanism, which includes an expansion airbag 124, a connecting column 125, a piston plate 126 and an elastic member 127. An air storage chamber 123 is opened in the upper inner part of the support shaft 82, and the expansion airbag 124 is connected to the upper outer part of the support shaft 82. Air holes are evenly spaced apart on the upper part of the support shaft 82, and the air holes connect the air storage chamber 123 and the expansion airbag 124. A piston plate 126 is slidably connected in the air storage chamber 123, and a connecting column 125 is connected to the middle of the bottom of the piston plate 126. The connecting column 125 passes through the upper part of the support shaft 82 and is connected to the top of the support tray 121. An elastic member 127 is connected between the support tray 121 and the support shaft 82, and the elastic member 127 is a return spring.

[0043] When the wheel hub 100 is placed on the support shaft 82 and the wheel hub 100 squeezes the supporting plate 121 to move downward, the elastic member 127 is compressed, and the supporting plate 121 can drive the piston plate 126 to move downward through the connecting column 125 when moving downward. When the piston plate 126 moves downward, the gas in the air storage chamber 123 is injected into the expansion airbag 124 through the air vent, so that the expansion airbag 124 expands and presses against the inner ring of the wheel hub 100, thereby assisting in fixing the wheel hub 100 on the support shaft 82, avoiding slipping when the support shaft 82 drives the wheel hub 100 to rotate, so as to ensure that the spraying work can proceed smoothly.

[0044] like Fig.12 and Fig.13 As shown, a gas filtering mechanism is also included, and the gas filtering mechanism includes a top frame 131, a fan 132 and an air filter plate 133. The top of the spray chamber 1 is connected to the top frame 131, the bottom of the top frame 131 is connected to the air filter plate 133, and a plurality of fans 132 are evenly installed on the front side of the top frame 131.

[0045] During the spraying process, some harmful gases will be generated in the spray chamber 1. At this time, the fan 132 can be controlled to exhaust air, and the gas in the spray chamber 1 will pass through the air filter plate 133 and then be discharged through the fan 132. During this whole process, the fan 132 will pass through the air filter plate 133, and the impurities in the harmful gas can be filtered through the air filter plate 133, thereby reducing the harmful substances in the gas and making the discharged air cleaner.

[0046] like Fig.12 and Fig.13 As shown, a liquid accumulation frame 141 is also included. The bottom of the spray chamber 1 is connected to the liquid accumulation frame 141. Half of the liquid accumulation frame 141 is filled with water. During the painting process, excess paint liquid will fall into the liquid accumulation frame 141. The paint liquid can be collected by the liquid accumulation frame 141 to prevent the accumulated liquid from falling on the bottom of the spray chamber 1 and flowing around to pollute the interior of the spray chamber 1.

[0047] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the spirit of the present invention.

Claims

1. A wheel hub omnidirectional spraying device, comprising a spraying chamber (1), characterized in that: It also comprises a bracket (2), a guide rail (3), a connecting seat (81), a support shaft (82), a support tray (121), a spraying mechanism and a rotating mechanism, wherein four brackets (2) are provided, and the four brackets (2) are connected with a guide rail (3), both sides of the spraying chamber (1) are provided with through grooves for the wheel hub (100) to pass through and the guide rail (3), the lower part of the guide rail (3) is evenly spaced and slidably connected with a plurality of connecting seats (81), the connecting seat (81) is rotatably connected with a support shaft (82) for placing the wheel hub (100), the upper part of the support shaft (82) is slidably connected with a support tray (121) for supporting the wheel hub (100), the spraying chamber (1) is provided with a spraying mechanism, and a rotating mechanism for driving the support shaft (82) to rotate is provided between the support shaft (82) and the guide rail (3); The spraying mechanism comprises an electric guide rail (101), a guide frame (102), an arc track (103), a guide shaft (104), a guide column (105), a connecting plate (107), a roller (106), a collar (74) and a spray gun (72). Two electric guide rails (101) are installed in the spraying chamber (1). The movable bodies of the two electric guide rails (101) are connected to the guide frames (102). The two guide frames (102) are movably connected to the guide shaft (104). The guide shaft (104) is provided with an arc track (103) on both sides, and connecting plates (107) are connected to the connecting plates (107). The connecting plates (107) are connected to guide columns (105) located in the arc track (103) and rollers (106) that abut against the outer arc surface of the arc track (103). The rollers (106) are tangent to the outer arc surface of the arc track (103). The guide shaft (104) is rotatably connected to a sleeve ring (74) in the middle, and a spray gun (72) is installed on the sleeve ring (74).

2. The all-round spraying device for a wheel hub according to claim 1, characterized in that: The edge position of the top of the support tray (121) is set in a conical shape to reduce the contact area between the wheel hub (100) and the support tray (121).

3. The all-round spraying device for a wheel hub according to claim 1, characterized in that: The spraying mechanism further comprises a liquid storage tank (71) and a liquid infusion tube (73); the liquid storage tank (71) is installed on the spraying chamber (1); the liquid storage tank (71) stores paint liquid; a water pump is installed in the liquid storage tank (71); a liquid infusion tube (73) is connected between the liquid outlet end of the water pump and the spray gun (72).

4. The all-round spraying device for a wheel hub as claimed in claim 3, characterized in that: The rotating mechanism comprises a servo motor (91), a driving gear (92) and a transmission gear (93); the lower portion of the support shaft (82) is connected to the transmission gear (93); the servo motor (91) is mounted on the guide track (3); the output shaft of the servo motor (91) is connected to the driving gear (92); when the support shaft (82) drives the wheel hub (100) to move to the painting position, the transmission gear (93) meshes with the driving gear (92).

5. The all-round spraying device for a wheel hub as claimed in claim 1, characterized in that: The invention also comprises a driving mechanism, which comprises a driving motor (51), a driving sprocket (52) and a chain (4), wherein the driving motor (51) is mounted on one of the brackets (2), the driving sprocket (52) is connected to the output shaft of the driving motor (51), the chain (4) is connected between the bottoms of the plurality of connecting seats (81), and the driving sprocket (52) is meshed with the chain (4).

6. The all-round spraying device for a wheel hub as claimed in claim 5, characterized in that: It also includes a blocking ring (6), wherein the bottom of the guide track (3) is connected with a circle of the blocking ring (6), and the blocking ring (6) blocks the outer side of the chain (4).

7. The all-round spraying device for a wheel hub as claimed in claim 1, characterized in that: The invention also comprises a swing mechanism, the swing mechanism comprising a cylinder (111), a connecting rod (112) and a convex shaft (113); the cylinder (111) is mounted on the guide shaft (104); the connecting rod (112) is connected to the telescopic rod of the cylinder (111); the connecting rod (112) is connected to the convex shaft (113); an inclined groove (114) is formed on the collar (74); and the convex shaft (113) is located in the inclined groove (114).

8. The all-round spraying device for a wheel hub as claimed in claim 1, characterized in that: The invention also comprises a limiting mechanism, wherein the limiting mechanism comprises an expansion airbag (124), a connecting column (125), a piston plate (126) and an elastic member (127); an air storage chamber (123) is provided in the upper part of the support shaft (82); the expansion airbag (124) is connected to the support shaft (82); air holes for connecting the air storage chamber (123) and the expansion airbag (124) are evenly spaced in the upper part of the support shaft (82); a piston plate (126) is slidably connected in the air storage chamber (123); a connecting column (125) is connected to the middle of the bottom of the piston plate (126); the connecting column (125) passes through the upper part of the support shaft (82) and is connected to the top of the bearing tray (121); an elastic member (127) is connected between the bearing tray (121) and the support shaft (82).

9. The all-round spraying device for a wheel hub as claimed in claim 1, characterized in that: It also includes a gas filtering mechanism, which includes a top frame (131), a fan (132) and an air filter plate (133); the top of the spray chamber (1) is connected to the top frame (131), the bottom of the top frame (131) is connected to the air filter plate (133), and a plurality of fans (132) are evenly spaced and installed on the top frame (131).

10. The all-round spraying device for a wheel hub according to claim 1, characterized in that: It also includes a liquid accumulation frame (141), and the bottom of the spraying chamber (1) is connected to the liquid accumulation frame (141) for collecting excess paint liquid.

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