An automatic painting apparatus

Abstract

The application discloses an automatic spraying equipment, which comprises a rack, a transmission chain, a plurality of clamping mechanisms arranged on the rack, a chain roller group connected to the bottom of the transmission chain, an inner side baffle arranged along the length direction of the transmission chain and located on the inner side of the transmission chain, an outer side baffle arranged along the length direction of the transmission chain and located on the outer side of the transmission chain, a channel formed between the inner side baffle and the outer side baffle for the clamping jig to extend out, an inner end of each mounting plate fixedly connected to the transmission chain, and a clamping roller group connected to the bottom of the outer end of each mounting plate for rolling on the rack. The automatic spraying equipment can effectively prevent paint or powder generated by a spraying gun from being deposited on the transmission chain, and is convenient for a mechanical hand to clamp and realizes automatic feeding and discharging.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of spraying technology, in particular to an automatic spraying equipment. BACKGROUND

[0002] In modern manufacturing industry, the paint spraying operation on the outer surface of the workpiece has become a routine process requirement. And with the popularization of automatic equipment, the automatic spraying production line has replaced the traditional manual spraying operation.

[0003] For example, the present invention with the publication number CN 105935636B discloses a spraying production line, which comprises a conveying belt, a plurality of clamping mechanisms for clamping workpieces are arranged on the conveying belt along the length direction, the conveying belt drives the clamping mechanisms to sequentially pass through the spraying station and the unloading station from the feeding station of the conveying belt, and then returns to the feeding station.

[0004] The conveying belt comprises a conveying track with an inner cavity, a roller set movably arranged in the conveying track, a hanging plate arranged below the conveying track, and the upper end of the hanging plate is sleeved on the rotating shaft of the roller set. An opening is arranged on the lower end surface of the conveying track, which is used for exposing the lower end of the hanging plate outside the conveying track and moving the hanging plate with the roller set. The opening extends along the length direction of the conveying track, and the clamping mechanism is fixed with the part of the hanging plate exposed outside the conveying track through the cross plate.

[0005] This invention has two significant shortcomings:

[0006] Firstly, in actual use, the overall protection performance of the spraying production line is not good, because the conveying belt does not have good protection performance as disclosed. Although the conveying belt is provided with a conveying track with an inner cavity to protect the roller set, the core part of the conveying belt, i.e. the transmission chain mechanism driving the roller set to move, is not protected as a whole. At the same time, the rotary drive mechanism driving the clamping mechanism to rotate is also not protected. In addition, although the spraying production line is provided with a material receiving sleeve on the clamping mechanism, there is a large gap distance between the material receiving sleeve and the conveying track with an inner cavity. In summary, in actual use, the paint or powder sprayed by the spray gun is easy to deposit on the transmission chain mechanism, the rotary drive mechanism and the clamping mechanism. With the extension of the use time, especially if the transmission chain mechanism deposits thick paint or powder, it will cause the transmission failure of the whole spraying production line.

[0007] Secondly, since the clamping mechanism and the conveying belt are connected through the fixing mode of the cross plate and the hanging plate, the upper end of the hanging plate is sleeved on the rotating shaft of the roller set, in the actual use process, the hanging plate will swing with the clamping mechanism, meanwhile, since each clamping mechanism is driven by the hanging plate, the distance between the adjacent two clamping mechanisms will change in real time in the swinging process of the respective hanging plates, so the mechanical hand cannot position and clamp the workpiece. SUMMARY

[0008] The first technical problem to be solved by the present application is to provide an automatic spraying device with excellent protection performance, which can effectively prevent the paint or powder generated by the spray gun from depositing on the transmission components, especially the transmission chain of the automatic spraying device.

[0009] The technical solution adopted by the present application to solve the first technical problem is as follows: an automatic spraying device, comprising a rack, a transmission chain arranged on the rack, a plurality of clamping mechanisms for clamping workpieces arranged at intervals along the transmission chain on the rack, the transmission chain driving the clamping mechanisms to run to corresponding workstations of the automatic spraying device, each clamping mechanism comprising a mounting plate, a body arranged above the mounting plate, and a clamping jig arranged above the body, a spray gun arranged inside the transmission chain at the spraying workstation, an inner baffle arranged along the length direction of the transmission chain on the inner side of the transmission chain on the rack, the inner baffle covering the transmission chain, an outer baffle arranged along the length direction of the transmission chain on the outer side of the transmission chain on the rack, and a running channel for the clamping jig to extend being formed between the inner baffle and the outer baffle.

[0010] Compared with the prior art, the present application has the following advantages in solving the first technical problem: the transmission chain is wrapped and blocked by the inner baffle, only a running channel for the clamping jig to extend is formed between the inner baffle and the outer baffle, in the spraying process, the spray port of the spray gun is not directly opposite to the transmission chain, the position of the transmission chain becomes behind the spray port, at the same time, the inner baffle and the outer baffle realize the wrapping and blocking effect on the transmission chain, thereby effectively preventing the paint or powder generated by the spray gun from depositing on the transmission chain.

[0011] The second technical problem to be solved by the present application is to provide an automatic spraying device, which can accurately ensure that the distance between the adjacent two workpieces on the clamping mechanism is equal, facilitate the clamping of the mechanical hand, and realize automatic feeding and discharging.

[0012] The technical scheme adopted by the present application to solve the second technical problem is: an automatic spraying device, comprising a rack, a conveying chain arranged on the rack, a plurality of clamping mechanisms for clamping workpieces being arranged on the rack at intervals along the length direction of the conveying chain, the conveying chain driving the clamping mechanisms to sequentially pass through a spraying station and a discharging station from a feeding station of the conveying chain, each clamping mechanism comprising a mounting plate, a body arranged on the mounting plate, and a clamping jig arranged on the body, a spray gun being arranged inside the conveying chain at the spraying station, the bottom of the conveying chain being connected with a chain roller set arranged on the rack for rolling, the inner end of each mounting plate being fixedly connected to the conveying chain, and the bottom of the outer end of each mounting plate being connected with a clamping roller set arranged on the rack for rolling.

[0013] Compared with the prior art, the present application has the advantage of solving the second technical problem in that: the chain roller set drives the conveying chain to move on the surface of the rack, the inner end of the mounting plate of the clamping mechanism is fixedly connected to the conveying chain, and the outer end of the mounting plate is arranged on the rack for rolling through the clamping roller set, thereby eliminating the structure of the hanging plate and avoiding the disadvantage of swinging of the hanging plate, so that the workpiece mounted on the clamping mechanism will not shake during the conveying process of the conveying chain, and since the pitches on the conveying chain are equal, the distance between the two adjacent clamping mechanisms can be kept unchanged, so that the distance between the two adjacent workpieces can be kept equal and unchanged, thereby facilitating the positioning and clamping of the mechanical hand and helping to realize automatic feeding and discharging.

[0014] The third technical problem to be solved by the present application is to provide an automatic spraying device which can effectively prevent the paint or powder generated by the spray gun from being deposited on the conveying chain, and can also accurately ensure that the distance between the two adjacent workpieces on the clamping mechanism is equal, thereby facilitating the clamping of the mechanical hand and realizing automatic feeding and discharging.

[0015] The third technical problem is solved by an automatic spraying device, comprising a rack, a conveying chain arranged on the rack, a plurality of clamping mechanisms for clamping workpieces being arranged on the rack at intervals along the length direction of the conveying chain, the conveying chain driving the clamping mechanisms to sequentially pass through a spraying station and a discharging station from a feeding station of the conveying chain, each clamping mechanism comprising a mounting plate, a body arranged on the mounting plate, and a clamping jig arranged on the body, a spraying gun being arranged inside the conveying chain at the spraying station, a chain roller set being connected to the bottom of the conveying chain for rolling on the rack, an inner side baffle being arranged on the rack at the inner side of the conveying chain along the length direction of the conveying chain, the inner side baffle covering the conveying chain, an outer side baffle being arranged on the rack at the outer side of the conveying chain along the length direction of the conveying chain, a channel for the clamping jigs to extend being formed between the inner side baffle and the outer side baffle, the inner end of each mounting plate being fixedly connected to the conveying chain, and a clamping roller set being connected to the bottom of the outer end of each mounting plate for rolling on the rack.

[0016] As an improvement, the rack is provided with a limiting baffle for blocking the side of the conveying chain, which facilitates limiting the conveying chain and preventing the conveying chain from shaking during the conveying process.

[0017] Further improvement, the rack is of a split structure, comprising a main rack and an end rack which are detachably connected, the end rack being arranged at the end of the main rack, a pusher being arranged in at least one of the main rack and the end rack, the output end of the pusher abutting against the other, preferably, the bottom of the end rack is provided with a roller, and preferably, the pusher is a push cylinder, by designing the rack as a split structure, after the fixed connection assembly between the main rack and the end rack is disassembled, the end rack is separated from the main rack under the pushing of the push cylinder, which on the one hand facilitates the installation of the conveying chain on the rack, and on the other hand facilitates the tensioning of the conveying chain.

[0018] Further improvement, the clamping jig is rotatably arranged on the body, a driven sprocket is arranged at the bottom of the clamping jig, a chain assembly is arranged on the rack at the spraying station, the chain assembly comprises a plurality of transmission sprockets, a chain sleeved on the transmission sprockets, a driving sprocket, and a driving motor connected with the driving sprocket, the driving sprocket is in transmission connection with one of the transmission sprockets, the height of the chain is basically the same as the height of the driven sprocket, and the driven sprocket is engaged with the outer side of the chain when the clamping mechanism passes through the spraying station. Since the existing clamping jig rotation usually adopts a leather sleeve sleeved at the bottom of the clamping jig, and then a belt is used for transmission, friction occurs between the belt and the leather sleeve, so as to drive the clamping jig to rotate. However, this method has a significant problem, that is, the leather sleeve and the belt are both vulnerable parts, and after being used for a long time, the leather sleeve and the belt are prone to wear. After wear, the clamping jig will slip, and the workpiece surface is prone to appear concave-convex during the spraying process. The present application sets a driven sprocket at the lower end of the clamping jig, the driving sprocket drives the chain to move, and the chain and the driven sprocket are engaged when the clamping jig passes through the chain, so as to drive the clamping jig to rotate. Since the chain wheel structure is used for transmission, the rubber wear phenomenon does not occur compared with the existing leather sleeve structure, the clamping jig rotation does not fail, the workpiece does not appear concave-convex, and the qualified rate of the workpiece is ensured.

[0019] Further improvement, the chain is a double-row chain, the transmission sprocket is engaged with one of the two rows of chains, and the driven sprocket is engaged with the other row of chains.

[0020] Further improvement, the rack is provided with a tensioning wheel for tensioning the chain.

[0021] Further improvement, the rack is provided with four transmission sprockets for driving the transmission chain, one of the transmission sprockets is provided with a transmission shaft, a driving motor is arranged at the bottom of the rack, and the output shaft of the driving motor is in transmission connection with the transmission shaft.

[0022] Further improvement, the rack is further provided with a cleaning station after the blanking station, the clamping mechanism is reset to the feeding station after passing through the cleaning station, and a cleaning room for cleaning the clamping jig on the clamping mechanism is arranged on the cleaning station. During the spraying process of the workpiece, the paint or the sprayed powder is easy to adhere to the clamping jig. By adding a cleaning station, the paint or the sprayed powder adhered to the clamping jig is cleaned by using a brush and an air gun, so as to avoid the paint and the sprayed powder from adhering to the next workpiece.

[0023] Further improvement, the clamping mechanism further comprises an ejector pin inserted into the clamping fixture, a baffle is arranged at the unloading station of the frame to lift the ejector pin when the clamping mechanism passes through the unloading station, the baffle comprises a flat baffle and an inclined baffle connected to the end of the flat baffle. The clamping fixture with the finished workpiece enters the unloading station, the baffle can lift the ejector pin, and finally the ejector pin lifts the workpiece, thereby facilitating the robot to unload the workpiece.

[0024] Further improvement, preferably, the inner baffle and the outer baffle jointly cover the transmission chain, the transmission sprocket, the chain, the driven sprocket, the clamping roller set, the chain roller set, and the body, thereby achieving comprehensive protection for the transmission chain driving the operation of the clamping mechanism, the core transmission components of the rotary driving mechanism driving the rotation of the clamping mechanism, and other components below the clamping mechanism, such as the body, and ensuring the normal operation of important transmission components of the equipment.

[0025] Compared with the prior art, the advantage of the present application in solving the third technical problem is that: the chain roller set drives the transmission chain to move on the surface of the frame, the inner baffle wraps and blocks the transmission chain, only a channel for the clamping fixture to extend is formed between the inner baffle and the outer baffle, during the spraying process, the spray port of the spray gun is not directly opposite to the transmission chain, and the position of the transmission chain becomes behind the spray port, at the same time, the inner baffle and the outer baffle achieve the wrapping and blocking effect on the transmission chain, thereby effectively avoiding the deposition of paint or powder generated by the spray gun on the transmission chain, at the same time, the inner end of the mounting plate of the clamping mechanism is fixedly connected to the transmission chain below the inner baffle and the outer baffle, and the outer end of the mounting plate is arranged on the frame by rolling through the clamping roller set, thereby eliminating the structure of the hanging plate and avoiding the adverse effects of the swinging of the hanging plate, finally, the workpiece mounted on the clamping mechanism will not shake during the conveying process of the transmission chain, at the same time, since the pitch on the transmission chain is equal, the distance between the adjacent two clamping mechanisms can be kept unchanged, finally, the distance between the adjacent two workpieces can be kept equal and unchanged, thereby facilitating the positioning and clamping of the robot, and helping to realize automatic unloading and loading. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a side view of the automatic spraying equipment in the embodiment of the present application (part of the clamping mechanism, part of the transmission chain, etc. have been removed);

[0027] Figure 2 is a top view of the automatic spraying equipment in the embodiment of the present application (part of the clamping mechanism, etc. have been removed);

[0028] Figure 3 is a structural schematic view of the chain assembly on the end frame in the embodiment of the present application;

[0029] Figure 4is the state structure schematic view of the clamping mechanism in the embodiment of the application when passing through the chain assembly;

[0030] shown in the figure:

[0031] frame 1, clamping mechanism 2, spraying room 3, cleaning room 4, baffle 5, conveying chain 6, chain assembly 7, workpiece 9, main body frame 11, end frame 12, transmission sprocket 13, transmission motor 14, body 21, clamping jig 22, driven sprocket 23, mounting plate 24, clamping roller set 25, spray gun 31, flat baffle 51, inclined baffle 52, chain roller set 61, chain 71, transmission sprocket 72, tension pulley 73, drive sprocket 74,

[0032] inner baffle 101, outer baffle 102, running channel 103, push cylinder 104, transmission shaft 121, roller 122, top rod 221, limit baffle 601, drive motor 741. DETAILED DESCRIPTION

[0033] The application will be further described in detail below with reference to the embodiments of the drawings.

[0034] As Figures 1 to 4 shown, the automatic spraying equipment in the embodiment includes frame 1, conveying chain 6, clamping mechanism 2, cleaning room 4, spraying room 3, and spray gun 31.

[0035] Among them, please refer to Figures 1 to 4 shown, the conveying chain 6 is arranged on the frame 1, and the frame 1 is provided with a plurality of clamping mechanisms 2 for clamping workpieces 9 arranged at intervals along the length direction of the conveying chain 6. The conveying chain 6 drives the clamping mechanisms 2 to sequentially pass through the spraying station and the unloading station from the feeding station of the conveying chain 6. Each clamping mechanism 2 includes a mounting plate 24, a body 21 arranged on the mounting plate 24, and a clamping jig 22 arranged on the body 21. The spraying station is provided with a spray gun 31 located inside the conveying chain 6. The bottom of the conveying chain 6 is connected with a chain roller set 61 arranged on the frame 1 for rolling.

[0036] Further, the frame 1 is provided with a limit baffle 601 for blocking the side of the conveying chain 6, as Figure 4The limiting baffle 601 is arranged to limit the transmission chain 6, preventing the transmission chain 6 from shaking during the transmission process. Meanwhile, an inner baffle 101 is arranged on the rack 1 at the inner side of the transmission chain 6 along the length direction of the transmission chain 6, the inner baffle 101 covers the transmission chain 6, an outer baffle 102 is arranged on the rack 1 at the outer side of the transmission chain 6 along the length direction of the transmission chain 6, and a running channel 103 for the clamping jig 22 to extend is formed between the inner baffle 101 and the outer baffle 102. The inner end of each mounting plate 24 is fixedly connected to the transmission chain 6, and the outer end of each mounting plate 24 is connected with a clamping roller 25 arranged on the rack 1 for rolling.

[0037] As shown in Figure 1 and 2 , the transmission mode of the transmission chain 6 is that four transmission sprockets 13 for transmitting the transmission chain 6 are arranged on the rack 1, one of the transmission sprockets 13 is provided with a transmission shaft 121, a transmission motor 14 is arranged at the bottom of the rack 1, and the output shaft of the transmission motor 14 is in transmission connection with the transmission shaft 121.

[0038] Preferably, in the embodiment of the present application, as shown in Figure 1 and 2 , the rack 1 is in a split structure, including a main rack 11 and an end rack 12 which are detachably fixedly connected. The end rack 12 is arranged at the end of the main rack 11, and the bottom of the end rack 12 is provided with a roller 122. A push cylinder 104 is arranged on the main rack 11, and the piston rod end of the push cylinder 104 abuts against the end rack 12. By designing the rack 1 in a split structure, after the detachable fixed connection assembly between the main rack 11 and the end rack 12 is disassembled, the end rack 12 is separated from the main rack 11 under the pushing of the push cylinder 104, so that on the one hand, the transmission chain 6 is facilitated to be installed on the rack 1, and on the other hand, the transmission chain 6 is facilitated to be tensioned.

[0039] In addition, as shown in Figures 3 to 4 , in the embodiment of the present application, the clamping jig 22 is rotatably arranged on the body 21, and a driven sprocket 23 is arranged at the bottom of the clamping jig 22. A chain assembly 7 is arranged on the rack 1 at the spraying station, the chain assembly 7 includes a plurality of transmission sprockets 72, a chain 71 sleeved on the transmission sprockets 72, a driving sprocket 74, and a driving motor 741 connected with the driving sprocket 74. The driving sprocket 74 is in transmission connection with one of the transmission sprockets 72, and the height of the chain 71 is substantially consistent with the height of the driven sprocket 23.

[0040] When the clamping mechanism 2 passes through the spraying station, the driven sprocket 23 meshes with the outer side of the chain 71, preferably the chain 71 is a double-row chain, the transmission sprocket 72 meshes with one row of the double-row chain. The driven sprocket 23 meshes with the other row of the double-row chain, and in order to facilitate tension control of the chain 71, a tensioning wheel 73 for tensioning the chain 71 is arranged on the rack 1.

[0041] Since the existing clamping fixture 22 is usually rotated by sleeving a leather sleeve on the bottom of the clamping fixture 22 and then driving by a belt, friction occurs between the belt and the leather sleeve, thereby driving the clamping fixture 22 to rotate. However, a significant problem of this mode is that the leather sleeve and the belt are both vulnerable parts, and after being used for a long time, the leather sleeve and the belt are prone to wear, and after wear, the clamping fixture 22 will slip, and during the spraying process, the workpiece surface is prone to appear concave-convex. The present application drives the chain 71 to move by arranging a driven sprocket 23 at the lower end of the clamping fixture 22 and a driving sprocket 74, when the clamping fixture 22 passes through the chain 71, the chain 71 meshes with the driven sprocket 23, thereby driving the clamping fixture 22 to rotate. Since the chain wheel structure is used for transmission, compared with the existing leather sleeve structure, the rubber wear phenomenon does not occur, the clamping fixture 22 does not fail to rotate, the workpiece 9 is prevented from appearing concave-convex, and the qualified rate of the workpiece is ensured.

[0042] In addition, as shown in Figure 1 and 2 , a cleaning station is further arranged on the rack 1 after the unloading station, the clamping mechanism 2 is reset to the feeding station after passing through the cleaning station, and a cleaning room 4 for cleaning the clamping fixture 22 on the clamping mechanism 2 is arranged on the cleaning station. During the spraying process of the workpiece, paint or powder is easy to adhere to the clamping fixture 22, by adding a cleaning station, the paint or powder adhered to the clamping fixture 22 is cleaned by using a brush and an air gun, and the paint and the powder are prevented from adhering to the next workpiece 9.

[0043] At the same time, in order to facilitate unloading, in the embodiment of the present application, as shown in Figure 1 and 4 , the clamping mechanism 2 further comprises a ejector rod 221 inserted into the clamping fixture 22. A baffle 5 for lifting the ejector rod 221 when the clamping mechanism 2 passes through the unloading station is arranged at the unloading station of the rack 1. The baffle 5 comprises a flat baffle 51 and an inclined baffle 52 connected to the end of the flat baffle 51. When the clamping fixture 22 with the workpiece after spraying enters the unloading station, the baffle 5 can lift the ejector rod 221, and finally the ejector rod 221 lifts the workpiece 9, thereby facilitating the unloading of the workpiece 9 by the manipulator.

[0044] In conclusion, the present application drives the transmission chain 6 on the surface of the rack 1 by the chain roller set 61, the inner side baffle 101 wraps and blocks the transmission chain 6, only the running channel 103 for the extension of the clamping jig 22 is formed between the inner side baffle 101 and the outer side baffle 102, in the spraying process, the spraying port of the spray gun 31 is not directly opposite to the transmission chain 6, the position of the transmission chain 6 becomes behind the spraying port, at the same time, the inner side baffle 101 and the outer side baffle 102 realize the wrapping and blocking effect on the transmission chain 6, so that the paint or powder generated by the spray gun can be effectively avoided from being deposited on the transmission chain 6, at the same time, the inner side baffle 101 and the outer side baffle 102 also realize the wrapping and blocking effect on the chain assembly 7 below and the part of the clamping mechanism 2 which does not extend into the running channel 103, and the paint or powder generated by the spray gun can also be effectively avoided from being deposited.

[0045] At the same time, below the inner side baffle 101 and the outer side baffle 102, the inner end of the mounting plate 24 of the clamping mechanism 2 is fixedly connected to the transmission chain 6, and the outer end of the mounting plate 24 is arranged on the rack 1 by rolling through the clamping roller set 25, the suspension plate structure is omitted, the disadvantage brought by the swing of the suspension plate is avoided, and finally the workpiece 8 mounted on the clamping mechanism 2 will not shake in the conveying process of the transmission chain 6. At the same time, since the pitches on the transmission chain 6 are equal, the distance between the adjacent two clamping mechanisms 2 can remain unchanged, and finally the distance between the adjacent two workpieces 9 can be ensured to be equal and remain unchanged, so as to facilitate the positioning and clamping of the mechanical hand, and help to realize the automatic feeding and discharging.

[0046] Finally, the present application also discloses an automatic spraying method of a workpiece, which comprises the following steps:

[0047] Step S1, in the feeding station, the workpiece 9 to be sprayed is mounted on the clamping jig 22 of each clamping mechanism 2;

[0048] Step S2, the transmission chain 6 conveys the clamping mechanism 2 on which the workpiece 9 to be sprayed is mounted to the spraying station, the workpiece to be sprayed enters the spraying room 3, and the spray gun 31 sprays the workpiece;

[0049] Step S3, the workpiece after spraying moves with the clamping mechanism 2 to the discharging station, the baffle 5 on the discharging station lifts the ejector rod 221, the ejector rod 221 lifts the workpiece 9 after spraying, and the mechanical hand automatically discharges the workpiece 9;

[0050] Step S4, the clamping mechanism 2 after discharging moves with the transmission chain 6 into the cleaning station, and the cleaning room 4 cleans the paint or powder adhered to the clamping jig 22;

[0051] Step S5, the clamping mechanism 2 after cleaning reenters the feeding station.

Claims

1. An automatic spraying device, comprising a rack (1), a conveying chain (6) arranged on the rack (1), and a plurality of clamping mechanisms (2) for clamping workpieces (9) arranged at intervals along the conveying chain (6), the conveying chain (6) driving the clamping mechanisms (2) to sequentially pass through an automatic spraying device in a feeding station, a spraying station, a discharging station, and a cleaning station, a spraying gun being arranged in the conveying chain (6) at the spraying station, a baffle (5) being arranged at the discharging station of the rack (1) and configured to lift a ejector rod (221) of the clamping mechanism (2) when the clamping mechanism (2) passes through the discharging station, characterized in that: The bottom of the transmission chain (6) is connected with a chain roller set (61) for rolling on the ring side above the frame (1), the pitch of the transmission chain is equal, so that the distance between the adjacent two clamping mechanisms remains unchanged; the clamping mechanism (2) comprises a mounting plate (24), a body (21) mounted on the mounting plate (24), and a clamping jig (22) rotatably sleeved on the body (21), the inner end of the mounting plate (24) is mounted on the top of the transmission chain (6), and the outer end of the mounting plate (24) is connected with a clamping roller set (25) for rolling on the ring side above the frame (1), the bottom of the clamping jig (22) is provided with a driven sprocket (23), a chain assembly (7) is arranged on the frame (1) at the spraying station, when the clamping mechanism (2) passes through the spraying station, the driven sprocket (23) is engaged with the chain (71) of the chain assembly (7), and the driven sprocket (23) and the chain (71) are located below the mounting plate (24); the inner side of the frame (1) is provided with an inner side baffle (101) arranged along the transmission chain (6) to cover the transmission chain (6), and the outer side of the frame (1) is also provided with an outer side baffle (102) arranged along the transmission chain (6), the running channel (103) for the clamping jig (22) to extend is formed between the outer edge side of the inner side baffle (101) and the inner edge side of the outer side baffle (102); the inner side baffle (101) and the outer side baffle (102) jointly cover the transmission chain (6), the clamping roller set (25), the chain roller set (61), the body (21), the driven sprocket (23) and the chain (71). ​ 2. The automatic spray painting apparatus according to claim 1, characterized by: The side of the transmission chain (6) is provided with a limiting baffle (601), and the limiting baffle (601) is mounted on the frame (1).

3. The automatic spray painting apparatus according to claim 1, characterized by: The frame (1) is of a split structure, comprising a main frame (11) and an end frame (12) which are detachably connected, the end frame (12) is arranged at the end of the main frame (11), and a pusher is arranged at least in one of the main frame (11) and the end frame (12), and the output end of the pusher abuts against the other.

4. The automatic spray painting apparatus according to claim 1, characterized by: The clamping jig (22) is rotatably sleeved on the body (21), and the bottom of the clamping jig (22) is provided with a driven sprocket (23), a chain assembly (7) is arranged on the frame (1) at the spraying station, the chain assembly (7) comprises a plurality of transmission sprockets (72), a chain (71) sleeved on the transmission sprockets (72), a driving sprocket (74), and a driving motor (741) connected with the driving sprocket (74), the driving sprocket (74) and one of the transmission sprockets (72) are in transmission connection, and when the clamping mechanism (2) passes through the spraying station, the driven sprocket (23) is engaged with the outer side of the chain (71).

5. The automatic spray painting apparatus according to claim 4, characterized by: The chain (71) is a double-row chain, the transmission sprocket (72) is engaged with one of the two rows of chains of the double-row chain, and the driven sprocket (23) is engaged with the other row of chains of the double-row chain.

6. The automatic spray painting apparatus according to claim 4, characterized by: The frame (1) is provided with a tensioning wheel (73) for tensioning the chain (71).

7. The automatic spray painting apparatus according to claim 1, characterized by: Four transmission sprockets (13) for driving the transmission chain (6) are arranged on the frame (1), one of the transmission sprockets (13) is provided with a transmission shaft (121), a transmission motor (14) is arranged at the bottom of the frame (1), and the output shaft of the transmission motor (14) is drivingly connected with the transmission shaft (121).

8. The automatic spray painting apparatus according to claim 1, characterized by: A cleaning station is further arranged on the frame (1) after the unloading station, the clamping mechanism (2) is reset to the loading station after passing through the cleaning station, and a cleaning room (4) for cleaning the clamping jig (22) on the clamping mechanism (2) is arranged on the cleaning station.

9. The automatic spray painting apparatus according to claim 3, characterized by: Rollers (122) are arranged at the bottom of the end frame (12).

10. The automatic spray painting apparatus according to claim 3, characterized by: The pusher is a push cylinder (104).

11. The automatic spray painting apparatus according to claim 4, characterized by: The inner side baffle (101) and the outer side baffle (102) jointly cover the transmission chain (6), the transmission sprocket (72), the chain (71), the driven sprocket (23), the clamping roller set (25), the chain roller set (61), and the body (21).

12. The automatic spray painting apparatus according to claim 8, characterized by: A spray gun is arranged in the transmission chain (6) at the spraying station.

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