Automatic paint sealing device for fastening screws

Abstract

The present invention relates to an automatic paint sealing device for fastening screws, comprising a lifting and swinging mechanism, a servo rotating mechanism, a pneumatic valve adjustment mechanism and a pneumatic injection valve system, wherein the lifting and swinging mechanism comprises a lifting cylinder, a swinging cylinder and a swinging support plate, and the swinging cylinder is driven to lift and lower by the lifting cylinder, and the swinging support plate is driven to rotate horizontally by the swinging cylinder, the servo rotating mechanism is arranged on the swinging support plate, and the servo rotating mechanism is provided with a rotating sleeve, the pneumatic valve adjustment mechanism is provided with a servo electric cylinder and a fixed plate, and the servo electric cylinder is driven to rotate by the rotating sleeve, and the fixed plate is driven to move by the servo electric cylinder, and the pneumatic injection valve system comprises an injection valve body and a paint rubber cylinder connected by a guide pipe, and the injection valve body can be finely adjusted on the fixed plate, and the paint rubber cylinder is arranged in the rotating sleeve. The present invention can automatically complete the painting and sealing operation of the fastening screws on the workpiece, and while ensuring the quality of the painting and sealing, it also improves the efficiency of the painting and sealing.

Description

Technical Field

[0001] The invention relates to the field of screw assembly, in particular to an automatic paint sealing device for fastening screws. Background Art

[0002] Fastening screws are used to firmly combine two workpieces together. They are an important link in mechanical assembly, and the tightening quality of screws is a key indicator to ensure the reliability of equipment assembly. In the aerospace field, which has extremely high requirements for product quality and reliability, it is required that after the screws in the key assembly links are tightened, they must be painted and marked. Specifically: the tightening of screws generally has a set tightening torque requirement to ensure that the tightening is firm and reliable. After the tightening is qualified, the tightening angle position of the screws is marked by using paint sealing. This makes it convenient for quality inspection or maintenance personnel to check whether the screws are loose, whether the product has been disassembled and replaced, and other abnormal conditions during the entire process cycle of equipment assembly and use. This is of great significance to ensuring product quality and reliability in product use.

[0003] When fasteners such as screws or nuts are painted and sealed, the prior art generally uses a quick-drying eye-catching red paint to draw a marking line between the movable parts such as screws or nuts and the fixed parts to indicate that the fasteners such as screws or nuts have been effectively tightened. In the prior art, due to the variety of fasteners, the cylindrical or hexagonal face of the fastener to be painted and sealed is usually not on the same plane as the paint-sealed part of the workpiece, so it is usually manually painted and sealed by using a brush dipped in red paint. Although the manual painting and sealing method is highly flexible, it is difficult to ensure the consistency of the coating quality, the coating efficiency is not high, and the quick-drying red paint generally contains harmful volatile components, which are harmful to the health of the operator. In addition, manual painting and sealing also limits the realization of automated and digital assembly production of products. Therefore, how to realize automatic and rapid painting and sealing of product fasteners is a technical problem that needs to be solved urgently, especially for products that use fastening screws arranged in a circular array for assembly and tightening. If the problem of automatic and rapid painting and sealing can be solved, the automation level of the assembly link will be greatly improved. Summary of the invention

[0004] The object of the present invention is to provide an automatic paint sealing device for fastening screws, which can automatically complete the paint sealing operation of fastening screws on a workpiece, while ensuring the paint sealing quality, and also improving the paint sealing efficiency.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A device for automatically painting and sealing fastening screws, comprising a lifting and swinging mechanism, a servo rotating mechanism, a pneumatic valve adjustment mechanism and a pneumatic injection valve system, wherein the lifting and swinging mechanism comprises a lifting cylinder, a swing cylinder and a swing support plate, and the swing cylinder is driven to lift and lower by the lifting cylinder, and the swing support plate is driven to rotate horizontally by the swing cylinder, the servo rotating mechanism is arranged on the swing support plate, and the servo rotating mechanism is provided with a rotating sleeve, the pneumatic valve adjustment mechanism is provided with a servo electric cylinder and a fixed plate, and the servo electric cylinder is driven to rotate by the rotating sleeve, and the fixed plate is driven to move by the servo electric cylinder, and the pneumatic injection valve system comprises an injection valve body and a paint cartridge connected by a guide tube, and the injection valve body can be fine-adjustably arranged on the fixed plate, and the paint cartridge is arranged in the rotating sleeve.

[0007] The lifting and swinging mechanism includes an adjusting support frame, wherein a lower limit block and an upper limit block are provided at the upper end of the adjusting support frame, and oil pressure buffers are provided on both sides of the lower limit block and the upper limit block, the cylinder body of the lifting cylinder is installed on the upper limit block, and the upper end of the piston rod of the lifting cylinder extends out of the cylinder body and is connected to the swing cylinder, and the lower end of the piston rod of the lifting cylinder extends out of the cylinder body and is connected to a buffer plate, the buffer plate is arranged between the lower limit block and the upper limit block and is limited by the oil pressure buffer, the lower end of the adjusting support frame is provided with a bottom plate fixedly connected to a fixed base, and an adjustment long hole is provided on the bottom plate at the lower end of the adjusting support frame.

[0008] The servo rotating mechanism comprises a servo motor, a driving wheel, a synchronous belt, a driven wheel and a rotating shaft sleeve, wherein the driving wheel is mounted on the output shaft of the servo motor, the driven wheel is sleeved on the rotating shaft sleeve, and the driving wheel is connected to the driven wheel through a synchronous belt.

[0009] The servo rotating mechanism includes a mounting seat arranged on the swing support plate, and a motor fixing seat is provided on one side of the mounting seat, and a bearing is provided on the other side. The servo motor and the driving wheel are arranged on the motor fixing seat, and the driven wheel is supported and rotated by the bearing. A counterweight block is provided at one end of the swing support plate away from the mounting seat.

[0010] The mounting seat is provided with a receiving groove, and the motor fixing seat is arranged in the receiving groove. The mounting seat is provided with an adjustment vertical plate on one side close to the motor fixing seat, and the adjustment vertical plate is provided with an adjustment screw. During assembly, the position of the motor fixing seat is adjusted by screwing the adjustment screw.

[0011] A rotating block is provided at the lower end of the rotating sleeve, and a mounting block is provided at one side of the servo electric cylinder of the pneumatic valve adjustment mechanism to be connected with the rotating block.

[0012] An adjustment connecting plate is provided on one side of the servo electric cylinder, and the adjustment connecting plate is connected to the fixed plate through an adapter block. An annular groove is provided at the end of the adjustment connecting plate, and the adapter block is adjustably installed at the annular groove of the adjustment connecting plate through a fixing screw.

[0013] The fixed plate is provided with a fine-tuning base plate, the fine-tuning base plate is provided with an adjustment pressure block and a dovetail slider, and the dovetail slider is arranged in a dovetail groove on the adjustment pressure block, the adjustment pressure block and the fine-tuning base plate are fixedly connected by an adjustment screw, and the adjustment screw is inserted into the adjustment pressure block and abuts against the dovetail slider.

[0014] The upper end of the paint cartridge is connected to a first air source device through a pipeline, the output end of the injection valve body is provided with a removable grease cover, and the rear end of the injection valve body is connected to a second air source device through a pipeline.

[0015] The lower end of the lifting and swinging mechanism is fixed on a ring-shaped conveyor line workbench, and the ring-shaped conveyor line workbench is provided with a ring-shaped conveyor line and a conveying support seat moving along the ring-shaped conveyor line. A workpiece buffer station and a loading and unloading robot are provided on one side of the ring-shaped conveyor line workbench.

[0016] The advantages and positive effects of the present invention are:

[0017] 1. The present invention can automatically complete the painting and sealing operation of the fastening screws on the workpiece through the cooperation of the lifting and swinging mechanism, the servo rotating mechanism, the pneumatic valve adjustment mechanism, etc., which ensures the quality of the painting and sealing while also improving the efficiency of the painting and sealing.

[0018] 2. The present invention adjusts the position and movement of the injection valve body through the pneumatic valve adjustment mechanism, and utilizes the pneumatic injection valve system to perform non-contact injection coating of the fastener paint seal and adjust the thickness of the paint seal mark. It has strong applicability and can achieve compatibility with multiple varieties.

[0019] 3. The present invention provides a grease cover to protect the injection end when the injection valve body does not work for a long time, so as to prevent the injection end from drying and clogging. The grease cover is pulled out when the present invention is used.

[0020] 4. The present invention can work in conjunction with an automated production line, thereby greatly improving the degree of automation in the workpiece assembly process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the use state of the present invention,

[0022] Figure 2 It is a structural schematic diagram of the present invention,

[0023] Figure 3 for Figure 2 A cross-sectional view of the present invention,

[0024] Figure 4 for Figure 2 Structural diagram of the servo rotating mechanism and pneumatic valve adjustment mechanism.

[0025] Figure 5 for Figure 4 The structural diagram of the servo rotating mechanism and the pneumatic valve adjustment mechanism from another angle.

[0026] Figure 6 for Figure 5 The structural diagram of the pneumatic injection valve system.

[0027] Figure 7 This is a schematic diagram of the structure of the present invention installed on a production line.

[0028] Among them, 1 is the workpiece buffer station; 2 is the loading and unloading robot; 3 is the ring conveyor line workbench; 4 is the workpiece, 51 is the lifting and swinging mechanism; 511 is the fixed base; 512 is the adjustment support frame; 513 is the buffer plate; 514 is the lower limit block; 5141 is the upper limit block; 515 is the hydraulic buffer; 516 is the lifting cylinder; 517 is the swing cylinder; 518 is the swing support plate; 519 is the counterweight block; 52 is the servo rotating mechanism; 521 is the servo motor; 522 is the driving wheel; 523 is the motor fixing seat; 524 is the adjustment vertical plate ; 525 is a synchronous belt; 526 is a driven wheel; 527 is a bearing; 528 is a mounting seat; 529 is a rotating sleeve; 5291 is a rotating block; 53 is a pneumatic valve adjustment mechanism; 531 is a mounting block; 532 is a servo electric cylinder; 533 is an adjustment connecting plate; 534 is a transfer block; 535 is a fixed plate; 536 is a fine-tuning base plate; 537 is an adjustment pressure block; 538 is a dovetail slider; 54 is a pneumatic injection valve system; 541 is an injection valve body; 542 is a paint cartridge; 543 is a cartridge cover; 544 is a guide tube; 55 is a grease cap. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings.

[0030] like Figures 1 to 7 As shown, the present invention includes a lifting and swinging mechanism 51, a servo rotating mechanism 52, a pneumatic valve adjustment mechanism 53 and a pneumatic injection valve system 54, wherein Figures 2-3 As shown, the lifting and swinging mechanism 51 includes a lifting cylinder 516, a swinging cylinder 517 and a swinging support plate 518, wherein the swinging cylinder 517 is driven to lift by the lifting cylinder 516, and the swinging support plate 518 is driven to rotate horizontally by the swinging cylinder 517, and the servo rotating mechanism 52 is arranged on the swinging support plate 518, as shown in FIG. Figure 4As shown, the servo rotating mechanism 52 is provided with a rotating sleeve 529, and the pneumatic valve adjustment mechanism 53 is provided with a servo electric cylinder 532 and a fixed plate 535, and the servo electric cylinder 532 is driven to rotate by the rotating sleeve 529, and the fixed plate 535 is driven to move by the servo electric cylinder 532. The stroke of the servo electric cylinder 532 is determined according to the length of the paint seal mark to be painted. The stroke of the servo electric cylinder 532 selected in this embodiment is 50 mm. Figures 5-6 As shown, the pneumatic jet valve system 54 includes a jet valve body 541 and a paint rubber cylinder 542 connected by a guide tube 544, and the jet valve body 541 is finely adjustable on the fixed plate 535, and the paint rubber cylinder 542 is arranged in the rotating sleeve 529. When the present invention is working, the pneumatic valve adjustment mechanism 53 and the jet valve body 541 are driven to rise and fall by the lifting cylinder 516 and driven to rotate horizontally by the swing cylinder 517 to move above the workpiece 4, and then the servo rotation mechanism 52 drives the jet valve body 541 to rotate around the workpiece 4 to above the fastening screw to be painted and sealed, and then the air source pressure of the pneumatic jet valve system 54, the jet frequency of the jet valve body 541, and the displacement and speed of the servo electric cylinder 532 in the pneumatic valve adjustment mechanism assembly 53 are controlled, so that the jet valve body 541 sprays on the fastening screw to form a uniform marking line with a width of about 2 mm.

[0031] like Figures 2-3 As shown, in this embodiment, the lifting and swinging mechanism 51 includes an adjusting support frame 512 and a fixed base 511, and the lifting cylinder 516 is arranged on the adjusting support frame 512, and the lower end of the adjusting support frame 512 is provided with a bottom plate fixedly connected to the fixed base 511, and the fixed base 511 is installed on the production line frame, and the bottom plate at the lower end of the adjusting support frame 512 is provided with an adjusting long hole for adjusting the rotation center position of the pneumatic injection valve system 54 during assembly.

[0032] like Figures 2-3As shown, the upper end of the adjustment support frame 512 is provided with a lower limit block 514 and an upper limit block 5141, and both sides of the lower limit block 514 and the upper limit block 5141 are provided with oil pressure buffers 515, the cylinder body of the lifting cylinder 516 is installed on the upper limit block 5141, and the upper end of the piston rod of the lifting cylinder 516 extends out of the cylinder body and is connected to the swing cylinder 517, and the lower end of the piston rod of the lifting cylinder 516 extends out of the cylinder body and is connected to a buffer plate 513, and the buffer plate 513 is arranged between the lower limit block 514 and the upper limit block 5141, and the connection part between the buffer plate 513 and the piston rod adopts The groove structure is used to prevent the buffer plate 513 from rotating and to make it evenly stressed. The lifting cylinder 516 drives the swing cylinder 517 to lift and lower through the piston rod. At the same time, the buffer plate 513 cooperates with the oil pressure buffer 515 on the lower limit block 514 and the upper limit block 5141 for buffering. The rotary shaft on the upper side of the swing cylinder 517 is connected to the swing support plate 518, which can achieve a swing of 0 to 90 degrees. The two ends of the swing support plate 518 are respectively provided with a counterweight block 519 and a servo rotating mechanism assembly 52. ​​The counterweight block 519 is used to balance the eccentric torque generated by the servo rotating mechanism assembly 52 on the swing support plate 518. The lifting cylinder 516, the swing cylinder 517 and the oil pressure buffer 515 are all well-known technologies in the art and are commercially available products.

[0033] like Figures 3-4 As shown, the servo rotating mechanism 52 includes a servo motor 521, a driving wheel 522, a synchronous belt 525, a driven wheel 526 and a rotating sleeve 529, wherein the driving wheel 522 is installed on the output shaft of the servo motor 521, the driven wheel 526 is sleeved on the rotating sleeve 529, and the driving wheel 522 is connected to the driven wheel 526 through the synchronous belt 525, and the paint cartridge 542 is inserted in the rotating sleeve 529.

[0034] like Figures 3-4 As shown, the servo rotating mechanism 52 includes a mounting seat 528, and the mounting seat 528 is arranged on the swing support plate 518 of the lifting and swinging mechanism 5, and the servo motor 521, the driving wheel 522, the synchronous belt 525 and the driven wheel 526 are all arranged on the mounting seat 528, wherein a motor fixing seat 523 is provided on one side of the mounting seat 528, and the servo motor 521 and the driving wheel 522 are arranged on the motor fixing seat 523, and a bearing 527 is provided on the other side of the mounting seat 528, and the driven wheel 526 is supported for rotation by the bearing 527. In this embodiment, the bearing 527 is a cross roller bearing.

[0035] like Figures 3-4As shown, the mounting seat 528 is provided with a receiving groove, and the motor fixing seat 523 is arranged in the receiving groove, the mounting seat 528 is provided with an adjustment vertical plate 524 on the side close to the motor fixing seat 523, and the adjustment vertical plate 524 is provided with an adjustment screw. During assembly, the position of the motor fixing seat 523 can be adjusted by screwing the adjustment screw, that is, the center distance between the driving wheel 522 and the driven wheel 526 inside it can be adjusted, and then the motor fixing seat 523 is fixed on the mounting work 528.

[0036] like Figure 4 A rotating block 5291 is provided at the lower end of the rotating sleeve 529, a mounting block 531 is provided on one side of the servo electric cylinder 532 of the pneumatic valve adjustment mechanism 53 and is connected to the rotating block 5291, an adjustment connecting plate 533 is provided on the other side of the servo electric cylinder 532, and the adjustment connecting plate 533 is connected to the fixed plate 535 through an adapter block 534. In this embodiment, an annular groove is provided at the end of the adjusting connecting plate 533, and the adapter block 534 is installed at the annular groove of the adjusting connecting plate 533 through a fixing screw, and the adapter block 534 can rotate around the annular groove to adjust the angle of the fixed plate 535. After the angle is determined, the fixing screw is tightened to lock the adapter block 534.

[0037] like Figures 4-5 As shown, a fine-tuning base plate 536 is provided on the fixed plate 535, and an adjusting pressure block 537 and a dovetail slider 538 are provided on the fine-tuning base plate 536, wherein the adjusting pressure block 537 is arranged on the side of the fine-tuning base plate 536 through a positioning pin guide, the adjusting pressure block 537 is in a dovetail groove structure, and the dovetail slider 538 is arranged in the dovetail groove of the adjusting pressure block 537, the adjusting pressure block 537 and the fine-tuning base plate 536 are fixedly connected by an adjusting screw, and the adjusting screw is inserted into the adjusting pressure block 537 and abuts against the dovetail slider 538, the adjusting screw between the adjusting pressure block 537 and the fine-tuning base plate 536 is loosened and tightened, and the dovetail slider 538 can slide to adjust the position, and when the position is determined, the adjusting screw is retightened to lock the dovetail slider 538, and the injection valve body 541 of the pneumatic injection valve system 54 is arranged on the dovetail slider 538.

[0038] like Figure 6As shown, the pneumatic injection valve system includes an injection valve body 541 and a paint rubber cartridge 542 connected by a guide tube 544. As described above, the injection valve body 541 is arranged on the dovetail slider 538, and the paint rubber cartridge 542 is arranged in the rotating shaft sleeve 529. The upper end of the paint rubber cartridge 542 is provided with a rubber cartridge cover 543, and the upper end of the paint rubber cartridge 542 is connected to the first air source device through a pipeline. The output end of the injection valve body 541 is provided with a removable grease cap 55, and the rear end of the injection valve body 541 is connected to the second air source device through a pipeline. When the present invention is not working, the grease cap 55 blocks the output port of the injection valve body 541 to prevent the paint in the injection valve body 541 from drying in the air and clogging the nozzle. When the present invention is working, the grease cap 55 is pulled out. The injection valve body 541 is a well-known technology in the art and is a commercially available product. In this embodiment, the pressure of the first air source for controlling the paint input is 0.1-0.3 MPa. The red epoxy nitro lacquer in the paint cartridge 542 enters the injection valve body 541 through the guide tube 544 under the pressure of 0.1-0.3 MPa, and the pressure of the second air source for controlling the injection of the injection valve body 541 is 0.6-0.9 MPa. The injection valve body 541 is driven by an air source of 0.6-0.9 MPa, and the injection frequency is controlled by a controller to stably spray out the red epoxy nitro lacquer.

[0039] like Figure 1 and Figure 7 As shown, the present invention can work in conjunction with an automated production line, wherein a fixed base 511 at the lower end of a lifting and swinging mechanism 51 is fixed on a ring conveyor line workbench 3, wherein the ring conveyor line workbench 3 is provided with a ring conveyor line and a conveying support seat moving along the ring conveyor line, and a workpiece buffer station 1 and a loading and unloading robot 2 are provided on one side of the ring conveyor line workbench 3. When the system is working, the workpiece 4 on the workpiece buffer station 1 is picked up by the loading and unloading robot 2 and placed on the conveying support seat, and the conveying support seat sends the workpiece 4 to the painting and sealing station, and then the present invention acts to complete the painting and sealing work of the fastening screws on the workpiece 4. After the painting and sealing work is completed, the conveying support seat moves along the ring conveyor line and returns to the starting point, and the loading and unloading robot 2 takes out the workpiece 4 that has been painted and sealed, and then picks up a new workpiece 4 and places it on the conveying support. The ring conveyor line is a well-known technology in the art and is a commercially available product.

[0040] The working principle of the present invention is:

[0041] When the present invention is working, the pneumatic valve adjustment mechanism 53 and the injection valve body 541 are driven to rise and fall by the lifting cylinder 516 and driven to rotate horizontally by the swing cylinder 517 to move above the workpiece 4, and then the servo rotation mechanism 52 drives the injection valve body 541 to rotate around the workpiece 4 to above the fastening screw to be painted and sealed, and then by controlling the air source pressure of the pneumatic injection valve system 54, the injection frequency of the injection valve body 541, and the displacement and speed of the servo electric cylinder 532 in the pneumatic valve adjustment mechanism assembly 53, etc., the injection valve body 541 is sprayed on the fastening screw to form a uniform marking line with a width of about 2 mm. In this embodiment, positioning sensors can be set on the swing support plate 518 and the rotating block 5291 as needed to ensure that the injection valve body 541 is accurately rotated to above the fastening screw to be painted, which is a well-known technology in the art.

[0042] In addition, Figure 1 and Figure 7 As shown, the present invention can work in conjunction with an automated production line, wherein the lower end of the lifting and swinging mechanism 51 is fixed on a ring-shaped conveyor line workbench 3, and the ring-shaped conveyor line workbench 3 is provided with a ring-shaped conveyor line and a conveying support seat moving along the ring-shaped conveyor line, and a workpiece cache station 1 and a loading and unloading robot 2 are provided on one side of the ring-shaped conveyor line workbench 3. When the system is working, the workpiece 4 on the workpiece cache station 1 is picked up by the loading and unloading robot 2 and placed on the conveying support seat, and the conveying support seat sends the workpiece 4 to the painting and sealing station, and then the present invention acts to complete the painting and sealing work of the fastening screws on the workpiece 4. After the painting and sealing work is completed, the conveying support seat moves along the ring-shaped conveyor line and returns to the starting point, and the loading and unloading robot 2 takes out the workpiece 4 that has completed the paint sealing and unloads it, and then picks up a new workpiece 4 and places it on the conveying support, thereby greatly improving the degree of automation in the assembly process of the workpiece 4.

Claims

1. An automatic paint sealing device for fastening screws, characterized in that: The invention comprises a lifting and swinging mechanism (51), a servo rotating mechanism (52), a pneumatic valve adjusting mechanism (53) and a pneumatic injection valve system (54), wherein the lifting and swinging mechanism (51) comprises a lifting cylinder (516), a swinging cylinder (517) and a swinging support plate (518), and the swinging cylinder (517) is driven to lift and lower by the lifting cylinder (516), and the swinging support plate (518) is driven to rotate horizontally by the swinging cylinder (517), and the servo rotating mechanism (52) is arranged on the swinging support plate (518), and the servo rotating mechanism (52) is provided with a rotating shaft sleeve (529). The pneumatic valve adjustment mechanism (53) is provided with a servo electric cylinder (532) and a fixed plate (535), and the servo electric cylinder (532) is driven to rotate by the rotating sleeve (529), and the fixed plate (535) is driven to move by the servo electric cylinder (532), and the pneumatic injection valve system (54) includes an injection valve body (541) and a paint rubber cartridge (542) connected by a guide tube (544), and the injection valve body (541) is finely adjustable on the fixed plate (535), and the paint rubber cartridge (542) is arranged in the rotating sleeve (529); The lifting and swinging mechanism (51) comprises an adjustment support frame (512), wherein a lower limit block (514) and an upper limit block (5141) are provided at the upper end of the adjustment support frame (512), and oil pressure buffers (515) are provided on both sides of the lower limit block (514) and both sides of the upper limit block (5141), the cylinder body of the lifting cylinder (516) is mounted on the upper limit block (5141), and the upper end of the piston rod of the lifting cylinder (516) protrudes out of the cylinder body The lower end of the piston rod of the lifting cylinder (516) extends out of the cylinder body and is connected to a buffer plate (513). The buffer plate (513) is arranged between the lower limit block (514) and the upper limit block (5141) and is limited by the oil pressure buffer (515). The lower end of the adjustment support frame (512) is provided with a bottom plate fixedly connected to a fixed base (511), and the bottom plate at the lower end of the adjustment support frame (512) is provided with an adjustment long hole; An adjustment connecting plate (533) is provided on one side of the servo electric cylinder (532), and the adjustment connecting plate (533) is connected to the fixing plate (535) via an adapter block (534); an annular groove is provided at the end of the adjustment connecting plate (533), and the adapter block (534) is adjustably mounted at the annular groove of the adjustment connecting plate (533) via a fixing screw; The fixing plate (535) is provided with a fine-tuning base plate (536), the fine-tuning base plate (536) is provided with an adjusting pressure block (537) and a dovetail slider (538), and the dovetail slider (538) is arranged in a dovetail groove on the adjusting pressure block (537), the adjusting pressure block (537) and the fine-tuning base plate (536) are fixedly connected by an adjusting screw, and the adjusting screw is inserted into the adjusting pressure block (537) and abuts against the dovetail slider (538).

2. The automatic paint sealing device for fastening screws according to claim 1, characterized in that: The servo rotating mechanism (52) comprises a servo motor (521), a driving wheel (522), a synchronous belt (525), a driven wheel (526) and a rotating shaft sleeve (529), wherein the driving wheel (522) is mounted on the output shaft of the servo motor (521), the driven wheel (526) is sleeved on the rotating shaft sleeve (529), and the driving wheel (522) is connected to the driven wheel (526) via a synchronous belt (525).

3. The automatic paint sealing device for fastening screws according to claim 2 is characterized in that: The servo rotating mechanism (52) comprises a mounting seat (528) disposed on the swing support plate (518), wherein a motor fixing seat (523) is disposed on one side of the mounting seat (528) and a bearing (527) is disposed on the other side thereof; the servo motor (521) and the driving wheel (522) are disposed on the motor fixing seat (523); the driven wheel (526) is supported for rotation by the bearing (527); and a counterweight block (519) is disposed on one end of the swing support plate (518) away from the mounting seat (528).

4. The automatic paint sealing device for fastening screws according to claim 3 is characterized in that: The mounting seat (528) is provided with a receiving groove, and the motor fixing seat (523) is arranged in the receiving groove. The mounting seat (528) is provided with an adjustment vertical plate (524) on a side close to the motor fixing seat (523), and the adjustment vertical plate (524) is provided with an adjustment screw. During assembly, the position of the motor fixing seat (523) is adjusted by screwing the adjustment screw.

5. The automatic paint sealing device for fastening screws according to claim 1, characterized in that: A rotating block (5291) is provided at the lower end of the rotating shaft sleeve (529), and a mounting block (531) is provided on one side of the servo electric cylinder (532) of the pneumatic valve adjustment mechanism (53) and is connected to the rotating block (5291).

6. The automatic paint sealing device for fastening screws according to claim 1, characterized in that: The upper end of the paint cartridge (542) is connected to a first air source device via a pipeline, the output end of the injection valve body (541) is provided with a removable grease sealing cap (55), and the rear end of the injection valve body (541) is connected to a second air source device via a pipeline.

7. The automatic paint sealing device for fastening screws according to claim 1, characterized in that: The lower end of the lifting and swinging mechanism (51) is fixed on a ring-shaped conveyor line workbench (3), and the ring-shaped conveyor line workbench (3) is provided with a ring-shaped conveyor line and a conveying support seat moving along the ring-shaped conveyor line. A workpiece buffer station (1) and a loading and unloading robot (2) are provided on one side of the ring-shaped conveyor line workbench (3).

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