Automatic powder coating reciprocating spraying device for large steel structural parts

Abstract

This invention discloses an automatic powder coating reciprocating spraying device for large steel structural components, specifically relating to the field of steel structural component spraying technology. It includes two nozzles, a main elastic suit, a secondary elastic suit, a shrinking elastic ring, and a grooved ring. The main elastic suit is located on one side of each nozzle; the secondary elastic suit is disposed inside the main elastic suit, and a shrinking elastic ring is fixed to one end of the secondary elastic suit; the grooved ring is disposed inside the shrinking elastic ring. This invention has the advantages of automatically completing emergency dustproof restoration without manual intervention after the main elastic suit is damaged, effectively preventing dust from entering the reciprocating structure, and significantly improving the durability of the automatic powder coating reciprocating spraying device for large steel structural components. It solves the problem that when a large amount of dust accumulates in the reciprocating structure, it is difficult to quickly achieve emergency dustproof restoration, leading to poor durability of the reciprocating spraying device over time.

Description

Technical Field

[0001] This invention relates to the field of steel structure component spraying technology, and more specifically, to an automatic powder coating reciprocating spraying device for large steel structure components. Background Technology

[0002] An automated reciprocating powder coating device for large steel structures controls multiple electrostatic spray guns through automated reciprocating motion, achieving efficient and uniform spraying of the steel structure surface. Its core purpose is to improve coating quality stability, production efficiency, and material utilization, while reducing labor costs and intensity. According to patent publication number CN110508432A, an automated reciprocating powder coating device significantly reduces volume compared to traditional structures, saving space and improving site adaptability. The reciprocating control structure exhibits balanced force, high strength, and good stability. Assembly and maintenance are simple and convenient, with a wide spraying range and good spraying effect. This technology is worthy of widespread application in the field, but the following problems still exist.

[0003] When large steel structural components are automatically powder coated, reciprocating spraying operations are frequent. To protect the reciprocating structure, operators need to wear elastic clothing to protect the reciprocating structure area from dust. However, if the dust clothing is damaged, dust will continue to penetrate into the reciprocating structure, and it is difficult to detect in time during the operation of the spraying device. By the time the device stops and maintenance personnel climb up to replace it, a large amount of dust has accumulated on the reciprocating structure. At this time, it is difficult to quickly restore the emergency dust protection. Over time, this leads to poor durability of the reciprocating spraying device. Summary of the Invention

[0004] To overcome the above-mentioned deficiencies of the prior art, the present invention proposes the following technical solution: an automatic powder coating reciprocating spraying device for large steel structure components, comprising two spray nozzles, wherein a main elastic sleeve is provided on one side of each spray nozzle; A secondary elastic garment is installed inside the main elastic garment, and a retractable elastic ring is fixed to one end of the secondary elastic garment; A grooved ring is disposed inside the shrinking spring ring, and the inner wall of the grooved ring is provided with a reciprocating detection element; An inner limiting component is installed at one end of the grooved ring, and the inner limiting component is provided with multiple arc-shaped strips; A release element is installed on the outside of the secondary elastic garment. The release element is provided with multiple insert rods, which are slidably connected to the retractable elastic ring. When the reciprocating detection component detects that the dust concentration inside the main elastic garment exceeds a set threshold, the reciprocating detection component drives the groove ring to be positioned within the shrinking elastic ring. The inner limiting component drives multiple arc-shaped strips to move to limit the angle between the shrinking elastic ring and the inner part of the secondary elastic garment. The disengaging component drives multiple insert rods to move and separate from the shrinking elastic ring, so that the shrinking elastic ring automatically shrinks and seals with the outer wall of the groove ring under its own elastic force. Then, the shrinking elastic ring drives the secondary elastic garment to perform a dustproof operation.

[0005] In a preferred embodiment, the reciprocating detection component includes: A sliding sleeve rod is fixed to the inner wall of the grooved ring. A reciprocating electric cylinder is installed at one end of the sliding sleeve rod, and the reciprocating electric cylinder is used to push the sliding sleeve rod to move. A pusher bar is fixedly installed at the other end of the sliding sleeve rod. Two linkage rods are fixed on one side of the pusher bar, and the linkage rods are fixedly connected to the nozzle. A convex ring is fixedly connected to the outer wall of the sliding sleeve rod and located away from the grooved ring. The convex ring is in contact with the main elastic garment. A grooved rail is provided on the outer wall of the sliding sleeve rod, and the sliding sleeve rod is slidably connected to the grooved rail. A support ring is provided on the outer wall of the grooved rail, and the auxiliary elastic suit is fixedly connected to the support ring. The support ring and the reciprocating electric cylinder are both fixedly connected to the grooved rail. A dust concentration sensor is installed on the outer wall of the support ring, and the dust concentration sensor is used to detect the dust concentration. The distance sensor is installed at one end of the groove rail.

[0006] In a preferred embodiment, the outer wall of the grooved ring is provided with a through groove in the shape of a vertical cross section, and the outer wall diameter of the convex ring is larger than the outer wall diameter of the grooved ring.

[0007] In a preferred embodiment, a sleeve is installed on the outer wall of the reciprocating electric cylinder, and the sleeve is fixedly connected to the reciprocating electric cylinder.

[0008] In a preferred embodiment, the inner limiting member includes: The second linear servo is installed at one end of the grooved ring, and a pressure ring is fixed to the output end of the second linear servo. Multiple balls roll on one side of the pressure ring. The outer wall of each ball is fitted with a protruding bar, which is fixedly connected to an arc-shaped bar. The protruding bar and the ball are in a rolling connection. A spring is fixed to one side of the outer wall of the protruding bar, and a sleeve block is fixedly installed at the top of the spring. The grooved ring is fixedly connected to the sleeve block.

[0009] In a preferred embodiment, a gap is provided between the arc-shaped strip and the pressure ring, and the plurality of the protruding bars are arranged in a circumferential distribution.

[0010] In a preferred embodiment, the sleeve block is used to guide the sliding of the convex rod, and the spring piece is used to provide elastic force to the convex rod.

[0011] In a preferred embodiment, the detachment component includes: A push ring is provided at one end of a plug rod, and multiple plug rods are fixedly connected to the push ring. A first linear servo is provided on one side of the push ring, and the retractable end of the first linear servo is fixedly connected to the push ring. A reciprocating slide bar is fixedly connected to one end of the first linear servo motor, and the reciprocating slide bar is fixedly connected to the support ring; A limiting ring is fixed to one end of the reciprocating slide bar, and the limiting ring abuts against the retraction spring ring.

[0012] In a preferred embodiment, a flexible hose is installed at the top of the nozzle, and both nozzles are connected to the flexible hose. The bottom end of the hose is fixedly connected to a powder tank, and a fan is installed at the top of the powder tank away from the hose. The input end of the fan is connected to a filter pipe.

[0013] In a preferred embodiment, a controller is provided on one side of the fan, and the dust concentration sensor and distance sensor are both electrically connected to the controller. The second linear servo and the first linear servo are both electrically connected to the controller. The controller has a threaded cover on one side, and the threaded cover is threadedly connected to the powder tank.

[0014] The technical effects and advantages of the present invention.

[0015] 1. This invention uses a dust concentration sensor to monitor the dust concentration inside the main elastic garment in real time. Once the concentration exceeds the standard, the dustproof function is deemed to have failed. The reciprocating detection component then drives the grooved ring to move to the inner area of ​​the shrinking elastic ring. At the same time, the inner limiting component drives multiple arc-shaped strips to limit and support the angle between the shrinking elastic ring and the inner side of the secondary elastic garment. The disengaging component drives the insert rod to separate from the shrinking elastic ring, so that the shrinking elastic ring automatically shrinks and seals itself against the outer wall of the grooved ring under its own elastic force. Then, the shrinking elastic ring drives the secondary elastic garment to quickly perform the dustproof operation. This invention enables automatic emergency dustproof restoration without machine shutdown and manual intervention after the main elastic garment is damaged. It effectively prevents dust from entering the reciprocating motion structure and significantly improves the durability of the automatic powder coating reciprocating spraying device for large steel structural components.

[0016] 2. This invention uses an internal limiting component. The controller activates a second linear servo to push the pressure ring to the left. The pressure ring squeezes multiple balls and drives the convex rod to move tilted along the inner wall of the sleeve block. The convex rod drives the arc strip to move precisely to the inner angle position between the shrinking elastic ring and the secondary elastic suit for limiting support. This ensures that the shrinking elastic ring can stably shrink along the outer wall of the arc strip after disengaging from the insert rod, avoiding deviation or jamming during shrinking of the shrinking elastic ring, and greatly improving the reliability and smoothness of the emergency seal of the secondary elastic suit.

[0017] 3. This invention employs a detachment mechanism. The controller activates the first linear servo motor, which drives the push ring and multiple insert rods to move to the right and separate from the shrinking spring ring. Simultaneously, the limiting ring limits the outer wall of the shrinking spring ring, allowing the shrinking spring ring to slide stably and shrink along the inner wall of the limiting ring and the outer walls of multiple arc-shaped strips under its own elastic force. Finally, after the inner diameter shrinks, it wraps around the circular through groove on the outer wall of the groove ring to achieve automatic sealing. Then, the shrinking spring ring drives the auxiliary elastic suit to quickly complete the emergency dustproof recovery, effectively preventing dust from entering the sliding fit range of the sliding sleeve rod and the groove rail, and significantly improving the durability of the reciprocating spraying device. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of the automatic powder coating reciprocating spraying device for large steel structural components according to the present invention.

[0019] Figure 2 This is a partial structural diagram of the vertical cross-section of the connection between the sleeve and the reciprocating electric cylinder of the present invention.

[0020] Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the middle.

[0021] Figure 4 This is a partial structural diagram of the vertical cross-section at the connection between the support ring and the groove rail of the present invention.

[0022] Figure 5 This is a partial structural diagram of the vertical cross-section at the connection between the arc-shaped strip and the convex rod of the present invention.

[0023] Figure 6 This is a schematic diagram of a partial structure of the detachment component of the present invention.

[0024] Figure 7 This is a top view of a partial structural diagram of the connection between the nozzle and the hose of the present invention.

[0025] Figure 8 This is a partial structural diagram of the connection between the hose and the powder container of the present invention, viewed from below.

[0026] The attached diagram is labeled as follows: 1. Nozzle; 2. Main elastic garment; 3. Secondary elastic garment; 4. Contraction spring ring; 5. Arc-shaped strip; 6. Insert rod; 7. Sliding sleeve rod; 8. Reciprocating electric cylinder; 9. Sleeve frame; 10. Push bar; 11. Linkage rod; 12. Convex ring; 13. Groove rail; 14. Support ring; 15. Dust concentration sensor; 16. Distance sensor; 17. Groove ring; 18. Pressure ring; 19. Ball bearing; 20. Convex bar rod; 21. Spring piece; 22. Sleeve block; 23. Push ring; 24. First linear servo motor; 25. Reciprocating slide bar; 26. Hose; 27. Limiting ring; 28. Powder tank; 29. ​​Fan; 30. Filter tube; 31. Controller; 32. Threaded cap; 33. Second linear servo motor. Detailed Implementation

[0027] The technical solution will now be described in detail and completely with reference to the embodiments and accompanying drawings of the present invention.

[0028] Example 1: In this technology, such as Figure 1 - Figure 3 The device shown is an automatic powder coating reciprocating spraying device for large steel structures, comprising two nozzles 1, a main elastic garment 2 on one side of the nozzle 1; a secondary elastic garment 3, disposed inside the main elastic garment 2, with a shrinking elastic ring 4 fixed at one end of the secondary elastic garment 3; a grooved ring 17, disposed inside the shrinking elastic ring 4, with a reciprocating detection component on the inner wall of the grooved ring 17; an inner limiting component, installed at one end of the grooved ring 17, with multiple arc-shaped strips 5 on the inner limiting component; and a release component, installed outside the secondary elastic garment 3, with multiple insert rods 6 on the release component, the insert rods 6 being slidably connected to the shrinking elastic ring 4.

[0029] In this embodiment, when the reciprocating detection component detects that the dust concentration inside the main elastic garment 2 exceeds the set threshold, the main elastic garment 2 fails to prevent dust from entering its interior. The reciprocating detection component drives the groove ring 17 to be positioned at a fixed distance within the shrinking elastic ring 4. The inner limiting component drives multiple arc-shaped strips 5 to move to limit the angle between the shrinking elastic ring 4 and the inner elastic garment 3. The disengaging component drives multiple insert rods 6 to move and separate from the shrinking elastic ring 4, so that the shrinking elastic ring 4 automatically shrinks and seals with the outer wall of the groove ring 17 under its own elastic force. Then, the shrinking elastic ring 4 drives the secondary elastic garment 3 to perform the dust prevention operation.

[0030] Example 2: Based on Example 1, this example discloses an automatic powder coating reciprocating spraying device for large steel structural components: In this technology, such as Figure 2 - Figure 4As shown, the reciprocating detection component includes: a sliding sleeve rod 7, fixed to the inner wall of the grooved ring 17, with a reciprocating electric cylinder 8 installed at one end of the sliding sleeve rod 7, the reciprocating electric cylinder 8 being used to push the sliding sleeve rod 7 to move; a push bar 10, fixedly installed at the other end of the sliding sleeve rod 7, with two linkage rods 11 fixed on one side of the push bar 10, the linkage rods 11 being fixedly connected to the nozzle 1; a convex ring 12, fixedly connected to the outer wall of the sliding sleeve rod 7 and located away from the grooved ring 17, the convex ring 12 being in contact with the main elastic garment 2; a grooved rail 13, set on the outer wall of the sliding sleeve rod 7, the sliding sleeve rod 7 and the grooved rail 13 being slidably connected, a support ring 14 being set on the outer wall of the grooved rail 13, the secondary elastic garment 3 being fixedly connected to the support ring 14, the support ring 14 and the reciprocating electric cylinder 8 being fixedly connected to the grooved rail 13, a dust concentration sensor 15 being installed on the outer wall of the support ring 14, the dust concentration sensor 15 being used to detect dust concentration; and a distance sensor 16, installed at one end of the grooved rail 13. The outer wall of the grooved ring 17 has a vertically annular through groove, and the outer diameter of the convex ring 12 is larger than the outer diameter of the grooved ring 17. A sleeve 9 is installed on the outer wall of the reciprocating electric cylinder 8, and the sleeve 9 is fixedly connected to the reciprocating electric cylinder 8.

[0031] In this embodiment, the sleeve 9 is fixed by inserting pre-embedded bolts into the bottom holes of the sleeve 9. The sleeve 9 supports the reciprocating electric cylinder 8, and the outer wall of the reciprocating electric cylinder 8 supports the groove rail 13. The outer wall of the groove rail 13 supports the support ring 14. The dust concentration sensor 15 on the support ring 14 can sense the dust concentration inside the main elastic garment 2. When the dust concentration value sensed by the dust concentration sensor 15 is the dust concentration threshold value set by the controller 31, the controller 31 immediately starts the reciprocating electric cylinder 8. The reciprocating electric cylinder 8 pushes the sliding sleeve rod 7 to the left. The sliding sleeve rod 7 moves along the inner side of the groove rail 13. The wall guide moves to the left, causing the sliding sleeve rod 7 to move the convex ring 12 to the left. At the same time, the sliding sleeve rod 7 moves the push bar 10 to the left, and the push bar 10 moves the two linkage rods 11 to the left. Simultaneously, the sliding sleeve rod 7 moves the grooved ring 17 to the left. The distance sensor 16 is supported by the grooved rail 13. The distance sensor 16 senses the distance between the grooved ring 17 and the distance sensor 16. When the distance value sensed by the distance sensor 16 is the same as the positioning distance set by the controller 31, the annular groove of the outer wall of the grooved ring 17 is positioned in the inner area of ​​the shrinking spring ring 4. In this way, the inner wall of the shrinking spring ring 4 and the annular groove of the outer wall of the grooved ring 17 will be aligned.

[0032] Example 3: Based on Example 1, this example discloses an automatic powder coating reciprocating spraying device for large steel structural components: In this technology, such as Figure 3 - Figure 5As shown, the inner limiting component includes: a second linear servo 33, installed at one end of the grooved ring 17, with a pressure ring 18 fixed to the output end of the second linear servo 33; multiple balls 19, all rolling on one side of the pressure ring 18, with a protruding rod 20 installed on the outer wall of the balls 19, and the protruding rod 20 is fixedly connected to the arc-shaped strip 5, and the protruding rod 20 and the balls 19 are in a rolling connection; a spring piece 21, fixed to one side of the outer wall of the protruding rod 20, with a sleeve block 22 fixedly installed at the top of the spring piece 21, and the grooved ring 17 is fixedly connected to the sleeve block 22. A gap is provided between the arc-shaped strip 5 and the pressure ring 18, and the multiple protruding rods 20 are arranged in a circumferential distribution. The sleeve block 22 is used to guide the sliding of the protruding rod 20, and the spring piece 21 is used to provide elastic force to the protruding rod 20.

[0033] In this embodiment, when the inner wall of the shrinking spring ring 4 is aligned with the annular groove of the outer wall of the groove ring 17, the second linear servo motor 33 is immediately activated by the controller 31. The output end of the second linear servo motor 33 pushes the pressure ring 18 to the left, and the pressure ring 18 squeezes multiple balls 19. The balls 19 roll along the pressure ring 18, and the multiple balls 19 drive the convex rod 20 to tilt and move. The convex rod 20 drives the bottom end of the spring piece 21 to squeeze. Since the groove ring 17 supports the sleeve block 22, the sleeve block 22 supports the top end of the spring piece 21. The spring piece 21 provides a rebound force to the convex rod 20, which facilitates the rebound and reset of the convex rod 20 later. When the convex rod 20 tilts and moves along the inner wall of the sleeve block 22, the convex rod 20 drives the arc strip 5 to move. In this way, the multiple arc strips 5 move to limit and support the angle position between the shrinking spring ring 4 and the auxiliary elastic servo 3.

[0034] Example 4: Based on Example 1, this example discloses an automatic powder coating reciprocating spraying device for large steel structural components: In this technology, such as Figure 3 - Figure 6 As shown, the detachment component includes: a push ring 23, which is disposed at one end of the insertion rod 6, and multiple insertion rods 6 are fixedly connected to the push ring 23. A first linear servo 24 is provided on one side of the push ring 23, and the retracted end of the first linear servo 24 is fixedly connected to the push ring 23; a reciprocating slide 25, which is fixedly connected to one end of the first linear servo 24, and the reciprocating slide 25 is fixedly connected to the support ring 14; and a limiting ring 27, which is fixed to one end of the reciprocating slide 25, and the limiting ring 27 abuts against the retracting spring ring 4.

[0035] In this embodiment, when multiple arc-shaped bars 5 provide limiting support at the angle between the contraction spring ring 4 and the auxiliary elastic suit 3, the controller 31 immediately activates the first linear servo motor 24. The support ring 14 supports the reciprocating slide bar 25, which improves the stability of the first linear servo motor 24. The output end of the first linear servo motor 24 drives the push ring 23 to move to the right, and the push ring 23 drives multiple insert rods 6 to move to the right, separating them from the contraction spring ring 4. Simultaneously, the reciprocating slide bar 25 supports the limiting ring 27, which limits the outer wall of the contraction spring ring 4. The shrinking spring ring 4 is limited by the limiting ring 27 under its own elastic force, ensuring that the shrinking spring ring 4 shrinks along the inner wall of the limiting ring 27 and slides along the outer wall of the multiple arc strips 5. After the inner diameter of the shrinking spring ring 4 shrinks, it will wrap in the annular groove of the outer wall of the groove ring 17 to achieve automatic shrinkage and sealing. Then, the shrinking spring ring 4 drives the auxiliary elastic garment 3 to perform dustproof operation. In this way, the auxiliary elastic garment 3 can quickly achieve emergency dustproof recovery, prevent dust from entering the sliding range of the sliding sleeve rod 7 and the groove rail 13, and improve the durability of the reciprocating spraying device.

[0036] Example 5: Based on Example 1, this example discloses an automatic powder coating reciprocating spraying device for large steel structural components: In this technology, such as Figure 7 - Figure 8 As shown, a flexible hose 26 is installed at the top of the nozzle 1, and both nozzles 1 are connected to the flexible hose 26. The bottom end of the flexible hose 26 is fixedly connected to a powder tank 28. A fan 29 is installed at the top of the powder tank 28, away from the flexible hose 26. The input end of the fan 29 is connected to a filter tube 30. A controller 31 is provided on one side of the fan 29. The dust concentration sensor 15 and the distance sensor 16 are both electrically connected to the controller 31. The second linear servo motor 33 and the first linear servo motor 24 are both electrically connected to the controller 31. A threaded cap 32 is provided on one side of the controller 31, and the threaded cap 32 is threadedly connected to the powder tank 28.

[0037] In this embodiment, when the main elastic garment 2 is in normal use, the threaded cover 32 is reversed to separate it from the powder tank 28. Then, the powder is poured into the powder tank 28, and the threaded cover 32 is rotated forward to close the powder tank 28. The controller 31 starts the fan 29, which filters the air through the filter pipe 30 and delivers it to the powder tank 28, pressurizing the powder and delivering it to the hose 26. The hose 26 enters the two nozzles 1, where powder is sprayed onto the large steel structure. Simultaneously, the controller 31 starts the reciprocating cylinder 8, which pushes the sliding rod 7 to the left and then to the right. This causes the sliding rod 7 to move left and then right along the inner wall of the groove rail 13. The sliding rod 7 then drives the pusher 10 to move left and then right. The two linkage rods 11 are moved to the left and then to the right. The linkage rods 11 cause the nozzle 1 to move to the left and then to the right. The two nozzles 1 can automatically spray powder on large steel structures in a reciprocating manner. At the same time, the sliding sleeve rod 7 drives the convex ring 12 to move to the left and then to the right. The convex ring 12 pulls the left end of the main elastic suit 2 to move to the left and then to the right. In this way, the main elastic suit 2 can perform telescopic operation. At the same time, the channel rail 13 provides limiting support for the right end of the main elastic suit 2. In this way, the main elastic suit 2 can provide dust protection for the reciprocating position of the sliding sleeve rod 7 and the channel rail 13.

[0038] When the main elastic garment 2 fails to protect against dust, the secondary elastic garment 3 can quickly restore its dust protection in an emergency. This is achieved by starting the reciprocating electric cylinder 8 via the controller 31. The reciprocating electric cylinder 8 drives the sliding sleeve rod 7 to move to the left and then to the right. The sliding sleeve rod 7 drives the grooved ring 17 to move to the left and then to the right. The annular groove on the outer wall of the grooved ring 17 drives the shrinking spring ring 4 to move to the left and then to the right. The shrinking spring ring 4 drives the secondary elastic garment 3 to move to the left and then to the right. The secondary elastic garment 3 is stretched for protection, while the right end of the secondary elastic garment 3 is supported by the support ring 14. In this way, the secondary elastic garment 3 continues to provide dust protection for the sliding position of the sliding sleeve rod 7 and the grooved rail 13. The secondary elastic garment 3 quickly restores its dust protection in an emergency, improving the durability of the reciprocating spraying device.

[0039] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, or improvements made within the technical concept and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A reciprocating powder coating device for automatic powder coating of large steel structures, comprising two spray heads (1), characterized in that: The nozzle (1) is provided with a main elastic garment (2) on one side; A secondary elastic garment (3) is set inside the main elastic garment (2), and a shrinkable elastic ring (4) is fixed at one end of the secondary elastic garment (3). A grooved ring (17) is disposed inside the shrinking spring ring (4), and the inner wall of the grooved ring (17) is provided with a reciprocating detection element; An inner limiting member is installed at one end of the grooved ring (17), and the inner limiting member is provided with multiple arc-shaped strips (5). The release element is installed on the outside of the secondary elastic garment (3), and the release element is provided with a plurality of insert rods (6), which are slidably connected to the retractable elastic ring (4); When the reciprocating detection component detects that the dust concentration inside the main elastic garment (2) exceeds the set threshold, the reciprocating detection component drives the groove ring (17) to be positioned at a fixed distance inside the shrinking elastic ring (4). The inner limiting component drives multiple arc-shaped strips (5) to move to limit the angle between the shrinking elastic ring (4) and the inner elastic garment (3). The disengaging component drives multiple insert rods (6) to move and separate from the shrinking elastic ring (4), so that the shrinking elastic ring (4) automatically shrinks and seals with the outer wall of the groove ring (17) under its own elastic force, and then the shrinking elastic ring (4) drives the inner elastic garment (3) to perform dustproof operation.

2. The apparatus according to claim 1, wherein: The reciprocating detection component includes: A sliding sleeve rod (7) is fixed to the inner wall of the grooved ring (17). A reciprocating electric cylinder (8) is installed at one end of the sliding sleeve rod (7). The reciprocating electric cylinder (8) is used to push the sliding sleeve rod (7) to move. Push bar (10) is fixedly installed at the other end of sliding sleeve rod (7). Two linkage rods (11) are fixed on one side of push bar (10). The linkage rods (11) are fixedly connected to nozzle (1). A convex ring (12) is fixedly connected to the outer wall of the sliding sleeve rod (7) at a position away from the grooved ring (17), and the convex ring (12) is in contact with the main elastic garment (2); The groove rail (13) is set on the outer wall of the sliding sleeve rod (7). The sliding sleeve rod (7) is slidably connected to the groove rail (13). The outer wall of the groove rail (13) is provided with a support ring (14). The auxiliary elastic garment (3) is fixedly connected to the support ring (14). The support ring (14) and the reciprocating electric cylinder (8) are both fixedly connected to the groove rail (13). The outer wall of the support ring (14) is equipped with a dust concentration sensor (15). The dust concentration sensor (15) is used to detect the dust concentration. A distance sensor (16) is installed at one end of the groove rail (13).

3. The apparatus according to claim 2, wherein: The outer wall of the grooved ring (17) has a through groove with a vertical cross-section of annular shape, and the outer wall diameter of the convex ring (12) is larger than the outer wall diameter of the grooved ring (17).

4. The apparatus according to claim 3, wherein: The outer wall of the reciprocating electric cylinder (8) is fitted with a sleeve (9), and the sleeve (9) is fixedly connected to the reciprocating electric cylinder (8).

5. The apparatus according to claim 4, wherein: The inner limiting component includes: The second linear servo (33) is installed at one end of the groove ring (17), and the output end of the second linear servo (33) is fixed with a pressure ring (18). Multiple balls (19) roll on one side of the pressure ring (18). The outer wall of the balls (19) is equipped with a protruding bar (20), and the protruding bar (20) is fixedly connected to the arc strip (5). The protruding bar (20) and the balls (19) are rolled together. The spring piece (21) is fixed to one side of the outer wall of the protruding bar (20). The top of the spring piece (21) is fixedly installed with a sleeve block (22). The grooved ring (17) is fixedly connected to the sleeve block (22).

6. The automatic powder coating reciprocating spraying device for large steel structural components according to claim 5, characterized in that: A gap is provided between the arc-shaped strip (5) and the pressure ring (18), and a plurality of the protruding bars (20) are arranged in a circumferential distribution.

7. The apparatus according to claim 6, wherein: The sleeve block (22) is used to guide the sliding of the protruding rod (20), and the spring piece (21) is used to provide elastic force to the protruding rod (20).

8. The apparatus according to claim 7, wherein: The release element includes: A push ring (23) is provided at one end of a plug rod (6). Multiple plug rods (6) are fixedly connected to the push ring (23). A first linear servo motor (24) is provided on one side of the push ring (23). The retractable end of the first linear servo motor (24) is fixedly connected to the push ring (23). A reciprocating slide bar (25) is fixedly connected to one end of the first linear servo motor (24), and the reciprocating slide bar (25) is fixedly connected to the support ring (14); A limiting ring (27) is fixed to one end of a reciprocating slide bar (25), and the limiting ring (27) abuts against the retractable spring ring (4).

9. The apparatus according to claim 8, wherein: The nozzle (1) is equipped with a hose (26) at its top end, and both nozzles (1) are connected to the hose (26); The bottom end of the hose (26) is fixedly connected to the powder tank (28), and a fan (29) is installed at the top of the powder tank (28) away from the hose (26). The input end of the fan (29) is connected to the filter pipe (30).

10. The apparatus according to claim 9, wherein: A controller (31) is provided on one side of the fan (29). The dust concentration sensor (15) and the distance sensor (16) are both electrically connected to the controller (31). The second linear servo motor (33) and the first linear servo motor (24) are both electrically connected to the controller (31). The controller (31) is provided with a threaded cover (32) on one side, and the threaded cover (32) is threadedly connected to the powder tank (28).

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