A pipe fitting coating device and its coating process

Abstract

The present invention relates to the field of pipe fitting processing, and discloses a pipe fitting coating device and its coating process, including a spraying box. A hanger and a flipping assembly are arranged in the spraying box. The hanger includes a hanging rod, and a plurality of bearing shafts are fixed on the hanging rod. First bushings and second bushings are respectively sleeved at both ends of each bearing shaft. Hooks are respectively fixed on the first bushing and the second bushing. The hooks are clamped with a sling through a stabilizer, and the sling is fixed to the pipe fitting. In the present invention, the pipe fitting is hoisted by the hooks and the sling. The sling is arranged at any position on the outer surface of the pipe fitting, solving common problems such as the inner cavity of the pipe fitting being hooked by the hook, resulting in no coating at the contact point of the hook, poor anti-corrosion ability of the inner cavity coating, and non-compliance of the sanitary index of the pipe fitting for drinking water due to the repair with the repair paint. The stabilizer is used to keep the pipe fitting in a stable state, avoiding incomplete spraying and uneven spraying thickness during the spraying process.

Description

Technical Field

[0001] The present invention relates to the field of pipe fitting processing, and in particular to a pipe fitting painting equipment and its painting process. Background Art

[0002] Pipe fittings are applied to various pipeline and pipe network system connection fields. A coating needs to be applied to the surface by various painting processes such as electrostatic spraying, electrostatic powder spraying, electrophoresis, and water-based paint dipping to play a role in decoration and anti-corrosion. The currently commonly used painting process equipment in the industry needs to hook the inner cavity of the pipe fitting with the hook of the hanger. The part where the hook contacts the inner cavity of the pipe fitting cannot be coated with the coating and needs to be repaired with touch-up paint later. On the one hand, it affects the appearance. The most important thing is that the anti-corrosion ability of the coating at the repaired part is low, and this part will quickly rust during the process of the pipeline transporting fluid medium. Especially for drinking water pipelines, there is also a situation where the hygiene index of the coating at the hook point repaired with touch-up paint does not meet the standard. And the subsequent rust of the pipe fitting brings an adverse impact on the drinking water hygiene index. Moreover, after the pipe fitting is hung on the hanger, it cannot be flipped and moved. During the painting process, the electric field strengths at different parts of the pipe fitting are inconsistent, and powders or paint mists in the air are likely to accumulate at the static bottom position, resulting in uneven coating, and the inner cavity also needs to be manually touch-up sprayed later, which affects the spraying efficiency. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a pipe fitting painting equipment and its painting process that can reduce the hoisting difficulty of the bent pipe and make the spraying uniform.

[0004] A pipe fitting painting equipment of the present invention includes a spraying box. A hanger and a flipping assembly are arranged in the spraying box. The hanger includes a hanging rod, and a plurality of bearing shafts are fixed on the hanging rod. First bushings and second bushings are respectively sleeved at both ends of each bearing shaft. Hooks are respectively fixed on the first bushing and the second bushing. The hooks are clamped with a suspension ring through a stabilizer. The suspension ring is fixed to the pipe fitting. The stabilizer is used to keep the pipe fitting in a stable state when rotating;

[0005] The flipping assembly is used to rotate two pipe fittings in different directions so that the inner cavities of the pipe fittings do not overlap. The flipping assembly includes a support rod and a flipping part. The support rod is driven by a driving part to reciprocate horizontally. A plurality of groups of flipping parts are arranged on the support rod. The flipping part includes a connecting rod. One end of the connecting rod is fixed to the support rod, and the other end of the connecting rod is fixed to the middle of a connecting shaft;

[0006] A set of rotating components is respectively arranged at both ends of the connecting shaft. One set of the rotating components is located at the top of the first bushing, and the other set of the rotating components is located at the bottom of the second bushing. The rotating component includes a first connecting rod. One end of the first connecting rod is hinged to the connecting shaft, the other end of the first connecting rod is hinged to one end of a first pin shaft, the other end of the first pin shaft is hinged to one end of a second connecting rod, and the other end of the second connecting rod is fixed to a support plate. One of the support plates is clamped with the first bushing, and the other support plate is clamped with the second bushing.

[0007] For a pipe fitting painting device of the present invention, the stabilizer includes an arc-shaped limiting block. The bottom surface of the arc-shaped limiting block is lapped with the hook, a limiting groove is opened on the top surface of the arc-shaped limiting block, the limiting groove is clamped with the hanging ring, arc-shaped sliding blocks are fixed on both sides of the arc-shaped limiting block, and the arc-shaped sliding blocks move along arc-shaped guide grooves opened on the outer surface of the hook.

[0008] For a pipe fitting painting device of the present invention, the driving part includes a hydraulic cylinder. The hydraulic cylinder is installed on the spraying box, the output end of the hydraulic cylinder is fixed to a guide block, the guide block moves along a guide hole opened on the side wall of the spraying box, and the guide block is fixed to the support rod.

[0009] For a pipe fitting painting device of the present invention, an iron block is fixed on each second connecting rod, the iron block is intermittently fixed to an electromagnetic rod, the electromagnetic rod is fixed on the side wall of the spraying box, and the electromagnetic rod is electrically connected to a power supply.

[0010] For a pipe fitting painting device of the present invention, a dovetail-shaped block is fixed on the top of the first bushing, and the dovetail-shaped block is also fixed on the bottom of the second bushing. The block is matched with a card slot opened on the support plate.

[0011] For a pipe fitting painting device of the present invention, the pipe fitting and the hanging ring are integrally cast, and the hanging ring is located at any position on the outer surface of the pipe fitting.

[0012] For a pipe fitting painting device of the present invention, a plurality of threaded holes are opened along the length direction of the hook handle of the hook. The threaded holes are threadedly connected with bolts. The bolts pass through fixing plates. The fixing plates are fixed on both the first bushing and the second bushing, and the ends of the bolts are tightened by nuts.

[0013] A pipe fitting painting device of the present invention and its painting process include the following steps:

[0014] S1, perform surface shot blasting treatment on the pipe fitting to remove impurities such as rust, dirt, and oxide scale;

[0015] S2, Add the accurately proportioned original paint or powder coating into the paint spraying can or powder spraying box;

[0016] S3, Hang the pipe fitting on the hook through the hanging ring, and then convey the fixture with the pipe fittings hung thereon into the spraying box;

[0017] S4, Start the spraying equipment for the first spraying. Stop spraying after 30 seconds. Start the hydraulic cylinder to make the support rod move horizontally, drive the rotating assembly to move, and make each group of pipe fittings rotate 60 degrees in different directions respectively, so that each group of pipe fittings is in a separated and non - stacked state. Start the spraying equipment, stop after spraying for 30 seconds, and then control the output end of the hydraulic cylinder to reset;

[0018] S5, Repeat step S4;

[0019] S6, After the spraying is completed, let it stand for one minute, run the fixture outside the spraying box, and check the spraying effect.

[0020] The differences between a pipe fitting coating equipment and its coating process of the present invention and the prior art are as follows:

[0021] A pipe fitting coating equipment and its coating process of the present invention hoist the pipe fitting through the hook and the hanging ring. The hanging ring is arranged at any position on the outer surface of the pipe fitting, solving the common problems that the hook hooks the inner cavity of the pipe fitting, resulting in no coating at the contact point of the hook, poor anti - corrosion ability of the inner cavity coating, and non - compliance of the sanitary index of the pipe fitting for drinking water due to the repair with the repair paint. And a stabilizer is used to keep the pipe fitting in a stable state, avoiding incomplete spraying and uneven spraying thickness during the spraying process.

[0022] The present invention enables two relatively parallel pipe fittings to rotate in different directions by setting a flipping assembly, so that the pipe fittings are in a separated and non - stacked state, avoiding the problem that the traditional spray head cannot spray the stacked pipe fittings during spraying. Furthermore, the inner cavity of the pipe fitting can be evenly sprayed, which can not only improve the spraying efficiency but also reduce the labor cost and equipment cost.

[0023] Through the combined use of the fixture and the flipping assembly, the present invention can reduce the floor area of the spraying box, also reduce the overall degree of manual participation, and improve the automation degree of the production line.

[0024] The following further explains a pipe fitting coating equipment and its coating process of the present invention with reference to the accompanying drawings. Description of the Drawings

[0025] Figure 1 is an axonometric perspective view of a pipe fitting coating equipment;

[0026] Figure 2 is an axonometric view of the fixture;

[0027] Figure 3 It is a schematic structural diagram of a hook and a ring.

[0028] Figure 4 It is Figure 3 a partially enlarged view of;

[0029] Figure 5 It is a schematic structural diagram of a flipping component;

[0030] Figure 6 It is a schematic diagram of the dynamic change of the pipe fitting flipping;

[0031] Figure 7 It is Figure 6 the front view of;

[0032] Figure 8 It is Figure 4 a schematic diagram of the structural change of.

[0033] In the figure:

[0034] spraying box 1, hanger 2, flipping component 3, pipe fitting 10, sliding door 11, collection tank 13;

[0035] hanging rod 21, bearing shaft 22, first bushing 23, second bushing 24, hook 25, ring 26;

[0036] drive part 20, flipping part 30, support rod 201, connecting rod 202, connecting shaft 203, hydraulic cylinder 200, guide block 204, guide wheel 205, guide track 206, base 207;

[0037] stabilizer 4, arc-shaped limit block 40, arc-shaped slider 41, arc-shaped guide groove 42, limit groove 43;

[0038] rotating component 5, first pin shaft 50, first connecting rod 51, second connecting rod 52, support plate 53, card slot 54, clamping block 55, electromagnetic rod 56;

[0039] threaded hole 81, bolt 82, fixing plate 83, nut 84. Specific embodiments

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0041] Please refer to Figures 1 to 8 , which specifically includes the following embodiments:

[0042] Embodiment 1:

[0043] A pipe fitting coating device includes a spraying box 1 and a spraying device. The spraying device is arranged inside the spraying box 1. Conventional spraying devices include spray nozzles, delivery pipes, paint cans, and pressurizing drivers, etc. In the present invention, a loop-shaped pipeline is arranged inside the spraying box 1 and is staggeredly arranged with the mechanical structure. Multiple spray nozzles are arranged on the pipeline, and the spray nozzles are aligned with the pipe fittings 10. The spray nozzles are distributed along the pipeline roughly horizontally and vertically. Specifically, for example, an elbow has two inner cavity outlets, and aligned spray nozzles are configured at the inner cavity outlets. The other outer surfaces of the elbow are all covered by the spraying areas of other spray nozzles. And a sliding door 11 is opened on the side of the spraying box 1 to facilitate the transportation of the pipe fittings 10 and improve the sealing performance of the entire spraying box 1.

[0044] In order to improve production efficiency and spray multiple pipe fittings 10 at one time, and to avoid the inner cavities of the stacked pipe fittings 10 being unevenly sprayed due to occlusion, a hanger 2 and a flipping assembly 3 are arranged inside the spraying box 1. The hanger 2 is used to hang multiple pipe fittings 10. The flipping assembly 3 is used to rotate two of the pipe fittings 10 in different directions so that the inner cavities of the pipe fittings 10 do not overlap, avoiding overlapping with each other and causing the spray nozzles on the same plane to be unable to spray in place. The present invention can avoid arranging other spray nozzles for spraying at a deflected angle to ensure uniform spraying of the inner cavities of the overlapping pipe fittings 10, thereby reducing the number of spray nozzles used.

[0045] Specifically, the hanger 2 includes a hanging rod 21, and multiple bearing shafts 22 are fixed on the hanging rod 21. As Figure 2 shown, taking three bearing shafts 22 set in the present invention as an example, first bushings 23 and second bushings 24 are respectively sleeved at both ends of each bearing shaft 22. The first bushings 23 and the second bushings 24 are respectively fixed with hooks 25. A suspension ring 26 is fixed on the pipe fitting 10. The suspension ring 26 is located at any position on the outer surface of the pipe fitting 10, generally coinciding with the spatial position of the center of gravity of the pipe fitting 10. The pipe fitting 10 and the suspension ring 26 of the present invention are integrally cast. After hanging the pipe fitting 10 on the hook 25 through the suspension ring 26, the pipe fitting 10 needs to be horizontally hoisted. In order to avoid irregular swinging and inability to maintain a horizontal state to align with the spray nozzles during the subsequent flipping process of the pipe fitting 10, resulting in incomplete spraying and uneven spraying thickness, therefore, the hook 25 and the suspension ring 26 are clamped by a stabilizer 4. The stabilizer 4 is used to keep the pipe fitting 10 in a stable state during rotation, and the inner cavity plane of the pipe fitting 10 is perpendicular to the horizontal plane.

[0046] Specifically, the stabilizer 4 includes an arc-shaped limit block 40, which is arranged in the hook 25. The bottom surface of the arc-shaped limit block 40 is lapped with the hook 25. A limit groove 43 is formed on the top surface of the arc-shaped limit block 40, and the limit groove 43 is clamped with the lifting ring 26. Arc-shaped sliders 41 are fixed on both sides of the arc-shaped limit block 40, and the arc-shaped sliders 41 move along an arc-shaped guide groove 42, and the arc-shaped guide groove 42 is formed on the outer surface of the hook 25.

[0047] As Figures 6 to 7 As shown, after the pipe fitting 10 of the present invention is hung on the stabilizer 4 of the hook 25 through the lifting ring 26, when the pipe fitting 10 is flipped subsequently, due to the self-gravity of the pipe fitting 10, the arc-shaped limit block 40 moves along the arc-shaped guide groove 42, so that after the two pipe fittings 10 are staggered from each other, the pipe fitting 10 is always in a horizontal state, and the inner cavity of the overlapping pipe fittings 10 can be covered by the spraying area of the spray head.

[0048] It should be noted that damping structures are provided on both the first bushing 23 and the second bushing 24 sleeved on the bearing shaft 22 to prevent the first bushing 23 and the second bushing 24 from rotating due to the gravity generated by the weight of the pipe fitting 10 itself. Common damping mechanisms such as springs can prevent them from rotating due to external ineffective acting forces.

[0049] The flipping assembly 3 includes a support rod 201 and a flipping part 30. The support rod 201 is driven by a driving part 20 to move horizontally back and forth. Multiple groups of flipping parts 30 are arranged on the support rod 201. Taking three groups of flipping parts 30 set in the present invention as an example, the flipping part 30 includes a connecting rod 202. One end of the connecting rod 202 is fixed to the support rod 201, and the other end of the connecting rod 202 is fixed to the middle of a connecting shaft 203;

[0050] A set of rotating assemblies 5 are respectively arranged at both ends of the connecting shaft 203. The rotating assembly 5 includes a first connecting rod 51. One end of the first connecting rod 51 is hinged to the connecting shaft 203, the other end of the first connecting rod 51 is hinged to one end of a first pin shaft 50, the other end of the first pin shaft 50 is hinged to one end of a second connecting rod 52, and the other end of the second connecting rod 52 is fixed to a support plate 53. One set of the rotating assemblies 5 is located on the top of the first bushing 23, and the other set of the rotating assemblies 5 is located at the bottom of the second bushing 24. One of the support plates 53 is clamped with the first bushing 23, and the other support plate 53 is clamped with the second bushing 24. The specific clamping method is as follows: a dovetail-shaped clamping block 55 is fixed on the top of the first bushing 23, and the same dovetail-shaped clamping block 55 is also fixed at the bottom of the second bushing 24, and the clamping block 55 is matched with a clamping groove 54 formed on the support plate 53.

[0051] It should be noted that as Figures 1 to 2 andFigure 5 As shown, the specific way that one set of the rotating components 5 is located at the top of the first bushing 23 is as follows: In the initial state, that is, before the pipe fitting 10 is flipped, the first connecting rod 51 is inclined from the lower left to the upper right, the second connecting rod 52 is inclined from the upper left to the lower right, the supporting plate 53 has an opening facing downward, the supporting plate 53 is clamped with the clamping block 55 at the top of the first bushing 23, and the first connecting rod 51 and the second connecting rod 52 are approximately in a ∧ shape and located above the first bushing 23;

[0052] The specific way that the other set of the rotating components 5 is located at the bottom of the second bushing 24 is as follows: In the initial state, that is, before the pipe fitting 10 is flipped, the first connecting rod 51 is inclined from the upper left to the lower right, the second connecting rod 52 is inclined from the lower left to the upper right, the supporting plate 53 has an opening facing upward, the supporting plate 53 is clamped with the clamping block 55 at the bottom of the second bushing 24, and the first connecting rod 51 and the second connecting rod 52 are approximately in a ∨ shape and located below the second bushing 24.

[0053] The above specific way is the initial motion state maintained by the rotating component 5, which is to ensure that when the support rod 201 drives the connecting shaft 203 to move horizontally back and forth, the first connecting rod 51 in the first set of rotating components 5 drives the second connecting rod 52 to have a tendency to swing clockwise, so as to finally make one pipe fitting 10 rotate clockwise. Moreover, the first connecting rod 51 in the second set of rotating components 5 drives the second connecting rod 52 to have a tendency to swing counterclockwise, so as to finally make the other pipe fitting 10 rotate counterclockwise. Therefore, the two pipe fittings 10 can be staggered, so that the originally overlapping inner cavity areas can be covered by the spraying areas.

[0054] As a further explanation of this embodiment, the swinging angle of the pipe fitting 10 is preferably 60 degrees, ensuring that the staggered distance between the two pipe fittings 10 enables their respective inner cavity surfaces to be covered by the spraying areas of the nozzles. The swinging angle of the pipe fitting 10 and the staggered distance between the two pipe fittings 10 are mainly related to the horizontal moving distance of the support rod 201, the length and diameter of the pipe fitting 10. Therefore, when the length and diameter of the pipe fitting 10 are relatively large, a relatively large horizontal moving distance is required to stagger the two pipe fittings 10. Therefore, in addition to increasing the horizontal moving distance, in order to save space, the present invention can also increase the length of the hook handle of the hook 25. Under the same rotation angle, the longer the hook handle, the larger the staggered distance between the two pipe fittings 10. The specific structure is as follows: Refer to Figure 8 , a plurality of threaded holes 81 are provided along the length direction of the hook handle of the hook 25, the threaded holes 81 are threadedly connected with bolts 82, the bolts 82 pass through the fixing plates 83, the fixing plates 83 are fixed on both the first bushing 23 and the second bushing 24, and the ends of the bolts 82 are fastened by nuts 84. The present invention selects different threaded holes 81, and thus uses different hook handle lengths, so it is suitable for hoisting and spraying pipe fittings 10 of different sizes.

[0055] As a further explanation of this embodiment, when the fixture 2 is not pushed into the spraying tank 1, the first link 51 and the second link 52 in the rotating assembly 5 are in an unconstrained state. To ensure the above-mentioned motion state and facilitate subsequent clamping, the present invention provides a limiting mechanism. The specific method is as follows: An iron block is fixed on each second link 52, and the iron block is intermittently fixed to the electromagnetic rod 56. The electromagnetic rod 56 is fixed on the side wall of the spraying tank 1, and the electromagnetic rod 56 is electrically connected to a power source. The present invention utilizes the principle of an electromagnet. After being energized, the electromagnetic rod 56 has magnetic force and adsorbs the iron block, ensuring that the first link 51 and the second link 52 are in a ∧-shaped or ∨-shaped motion state, ensuring the relative position between the fixture 2 and the rotating assembly 5, and ensuring that the clamping is in place. When the pipe fitting 10 needs to be flipped, the power source controls the power-off, so that the electromagnetic rod 56 no longer adsorbs the iron block, thus not hindering the movement of the rotating assembly 5. Among them, the number of electromagnetic rods 56 is the same as the number of second links 52.

[0056] As a further explanation of this embodiment, refer to Figure 5 , the driving part 20 includes a hydraulic cylinder 200. The hydraulic cylinder 200 is installed on the spraying tank 1. The output end of the hydraulic cylinder 200 is fixed to the guide block 204. The guide block 204 moves along a guide hole opened on the side wall of the spraying tank 1, and the guide block 204 is fixed to the support rod 201.

[0057] The present invention drives the guide block 204 to reciprocate horizontally by controlling the output end of the hydraulic cylinder 200, so that the support rod 201 moves horizontally back and forth, so that the rotating assembly 5 can move, and each group of pipe fittings 10 is separated by a certain angle and then reset.

[0058] As a further explanation of this embodiment, refer to Figures 1 to 2 , the hanging rod 21 is fixed to the base 207. Two rows of guide wheels 205 are provided at the bottom of the base 207. The guide wheels 205 can move along the guide track 206. The guide track 206 is fixed to the bottom of the spraying tank 1. A collection tank 13 is provided between the two groups of guide tracks 206.

[0059] The present invention enables the fixture 2 for mounting the pipe fitting 10 to enter the spraying tank 1 through the guide track 206, which has a positioning function, ensures the stability of the docking between the fixture 2 and the rotating assembly 5, facilitates the operation of workers, and moreover, facilitates the random movement of the fixture 2 outside the spraying tank 1, improving production efficiency. The collection tank 13 is located at the bottom of the spraying tank 1, and the dripping paint flows into it. The collected paint is used for repeated use after filtration.

[0060] The present invention also includes a pipe fitting coating process, which can be applied to various coating processes such as spray painting, electrophoresis, dip painting, fluidized bed, and electrostatic powder spraying. The process includes the following steps:

[0061] S1. Shot blast the surface of the pipe fitting 10 to remove impurities such as grease, dirt, scale, and rust. Use methods such as sandblasting and shot blasting to remove rust and scale on the surface of the pipe fitting 10, and wipe the pipe fitting 10 with a degreaser or organic solvent.

[0062] S2. Precisely proportion the primer, topcoat, and thinner. Thoroughly stir the prepared paint or powder coating until evenly mixed to ensure consistent performance. Pour the prepared paint or powder coating into the paint spray can or powder spraying box in the spraying equipment.

[0063] S3. Hang the pipe fitting 10 onto the hook 25 through the hanging ring 26 to make each pipe fitting 10 horizontally placed. Then, convey the fixture 2 full of pipe fittings 10 to the spraying box 1 along the guiding track 206. During the conveyance, ensure that the first bushing 23 and the second bushing 24 of each group can be firmly clamped to the pallet 53, and close the sliding door 11.

[0064] S4. Start the spraying equipment for the first spraying. Stop spraying after 30 seconds. Control the power supply to cut off the electricity to make the electromagnetic rod 56 ineffective, and start the hydraulic cylinder 200 to make the support rod 201 move horizontally, driving the rotating assembly 5 to move, so that each group of pipe fittings 10 rotates 60 degrees in different directions respectively, so that each group of pipe fittings 10 is in a separated and non - stacked state. Start the spraying equipment, stop spraying after 30 seconds, and then control the output end of the hydraulic cylinder 200 to reset.

[0065] S5. Repeat step S4.

[0066] S6. After the spraying is completed, let it stand for one minute. Control the power supply to be energized to make the electromagnetic rod 56 have magnetism, adsorb the second connecting rod 52, and ensure the structural state of the rotating assembly 5. Then convey the fixture 2 outside the spraying box 1, check the spraying effect, and perform manual touch - up painting on those that do not meet the spraying effect.

Claims

1. A pipe fitting coating device, comprising a spraying box, characterized in that: Inside the spraying box, there are hangers and a flipping assembly. The hanger includes a hanging rod, and multiple bearing shafts are fixed on the hanging rod. At both ends of each bearing shaft, a first bushing and a second bushing are sleeved respectively. Hooks are fixed on the first bushing and the second bushing respectively. The hook and the sling are clamped by a stabilizer. The sling is fixed to the pipe fitting, and the stabilizer is used to keep the pipe fitting in a stable state during rotation. The flipping assembly is used to rotate the two pipe fittings in different directions so that the inner cavities of the pipe fittings do not overlap. The flipping assembly includes a support rod and a flipping part. The support rod is driven by a driving part to move horizontally back and forth. Multiple groups of flipping parts are arranged on the support rod. The flipping part includes a connecting rod. One end of the connecting rod is fixed to the support rod, and the other end of the connecting rod is fixed to the middle of the connecting shaft. One set of rotating assemblies is arranged at both ends of the connecting shaft respectively. One set of the rotating assemblies is located at the top of the first bushing, and the other set of the rotating assemblies is located at the bottom of the second bushing. The rotating assembly includes a first connecting rod. One end of the first connecting rod is hinged to the connecting shaft, and the other end of the first connecting rod is hinged to one end of a first pin shaft. The other end of the first pin shaft is hinged to one end of a second connecting rod. The other end of the second connecting rod is fixed to a support plate. One of the support plates is clamped with the first bushing, and the other support plate is clamped with the second bushing.

2. The pipe fitting painting equipment according to claim 1, characterized in that: The stabilizer includes an arc-shaped limiting block. The bottom surface of the arc-shaped limiting block is lapped with the hook. A limiting groove is opened on the top surface of the arc-shaped limiting block. The limiting groove is clamped with the sling. Arc-shaped sliding blocks are fixed on both sides of the arc-shaped limiting block. The arc-shaped sliding blocks move along arc-shaped guide grooves opened on the outer surface of the hook.

3. A pipe fitting coating device according to claim 2, characterized in that: The driving part includes a hydraulic cylinder. The hydraulic cylinder is installed on the spraying box. The output end of the hydraulic cylinder is fixed to a guide block. The guide block moves along a guide hole opened on the side wall of the spraying box. The guide block is fixed to the support rod.

4. The pipe fitting coating equipment according to claim 3, characterized in that: An iron block is fixed on each second connecting rod. The iron block is intermittently fixed to an electromagnetic rod. The electromagnetic rod is fixed on the side wall of the spraying box. The electromagnetic rod is electrically connected to a power supply.

5. A pipe fitting coating device according to claim 4, characterized in that: A dovetail-shaped clamping block is fixed on the top of the first bushing, and the dovetail-shaped clamping block is also fixed on the bottom of the second bushing. The clamping block is matched with a clamping groove opened on the support plate.

6. The pipe fitting painting equipment according to claim 5, characterized in that: The pipe fitting and the sling are integrally cast, and the sling is located at any position on the outer surface of the pipe fitting.

7. The pipe fitting coating equipment according to claim 6, characterized in that: Multiple threaded holes are opened along the length direction of the hook handle of the hook. The threaded holes are threadedly connected with bolts. The bolts pass through fixing plates. The fixing plates are fixed on both the first bushing and the second bushing. The end of the bolt is fastened by a nut.

8. A pipe fitting coating process, based on a pipe fitting coating device according to claim 7, characterized in that: It includes the following steps: S1, perform surface shot peening treatment on the pipe fitting to remove impurities such as rust, dirt, and oxide scale. S2, add accurately proportioned original paint or powder coating into the paint spraying can or powder spraying box. S3, hang the pipe fitting onto the hook through the sling, and then convey the hanger full of the pipe fittings into the spraying box. S4. Turn on the spraying equipment for the first spraying. Stop spraying after 30 seconds. Turn on the hydraulic cylinder to make the support rod move horizontally, drive the rotating assembly to move, and make each group of pipe fittings rotate 60 degrees in different directions respectively, so that each group of pipe fittings is in a separated and non-overlapping state. Then turn on the spraying equipment, stop spraying after 30 seconds, and then control the output end of the hydraulic cylinder to reset. S5. Repeat step S4. S6. After the spraying is completed, let it stand for one minute, move the hanger outside the spraying box, and check the spraying effect.

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