Internal painting equipment for large-diameter butt-welded pipe fittings

Abstract

This invention relates to the field of pipe painting equipment technology, specifically disclosing an internal painting device for large-diameter butt-welded pipe fittings. The device includes mounting plates, with support rods rotatably connected to the side surfaces of two mounting plates. Three support rods are fixedly spaced around the central axis of the same mounting plate. A roller is rotatably connected to the end of each support rod furthest from the mounting plate. A motor is fixedly connected to the outer surface of each support rod, with the roller meshing with the output end of the motor. By setting adjustable support rods, the deployment angle of the support rods can be adjusted, allowing the device to adapt to pipe fittings of different diameters, greatly improving its applicability. When the angle of the support rods changes, a second stabilizing rod causes the spray pipe to expand and contract, ensuring that the distance between the nozzle on the spray pipe and the inner surface of different pipe fittings remains constant, thus significantly improving the working stability of the device and ensuring painting quality.

Description

Technical Field

[0001] This invention relates to the field of pipe painting equipment technology, specifically to an internal painting equipment for large-diameter butt-welded pipes. Background Technology

[0002] In the field of pipe fittings processing, internal painting of large-diameter butt-welded pipe fittings is an important process. Related painting equipment is used to evenly spray protective paint or coating materials onto the interior of the pipe fittings after welding, preventing corrosion and wear, improving durability and aesthetics, and ensuring the safe and stable operation of the pipe fittings in various industrial pipeline systems. This is crucial for fluid transportation in industries such as petroleum, chemical, and construction.

[0003] Traditional internal painting equipment for large-diameter butt-welded pipe fittings has several drawbacks. Firstly, it lacks adaptability; structures such as support rods are often fixed or have a narrow adjustment range, making it difficult to adapt to pipe fittings of different diameters. This necessitates frequent equipment changes or complex adjustments, increasing costs and time consumption and reducing production efficiency. Secondly, the painting stability is insufficient; the distance between the nozzle and the inner wall of the pipe fitting is difficult to maintain consistently, easily leading to uneven paint thickness and missed areas when the pipe diameter changes, affecting product quality and protective effect. Furthermore, the control of the protective paint spray volume is poor, unable to dynamically adjust with the pipe diameter. This easily results in insufficient paint on larger diameter pipes and excessive paint on smaller diameter pipes, causing defects such as runs and accumulation, reducing the paint pass rate. In addition, when the equipment moves inside the pipe fitting, the friction between the rollers and the fitting is unstable, easily causing slippage and jamming in large-diameter pipes, interrupting the painting process and causing paint defects. These shortcomings make it difficult to meet the high-precision, high-efficiency, and high-quality production requirements of pipe fitting processing, necessitating optimization and upgrading. Summary of the Invention

[0004] This invention provides an internal painting device for large-diameter butt-welded pipe fittings, which solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an internal painting device for large-diameter butt-welded pipe fittings, comprising mounting plates, two mounting plates arranged parallel to each other, support rods rotatably connected to the side surfaces of the two mounting plates, three support rods fixedly spaced around the central axis of the same mounting plate, and rollers rotatably connected to the end of each support rod away from the mounting plate, wherein the support rods on the two mounting plates are arranged opposite to each other, and a No. 1 motor is fixedly connected to the outer surface of each support rod, wherein the rollers mesh with the output end of the No. 1 motor, and further comprising:

[0006] An adjustment mechanism is fixedly installed on both sides of the mounting plate, and the adjustment mechanism controls the opening and closing angle of the support rod;

[0007] A painting mechanism is fixedly mounted on an adjustment mechanism, and the painting mechanism works in conjunction with the adjustment mechanism.

[0008] The adjusting mechanism includes a connecting rod, which is fixedly connected to the surfaces of two mounting plates on opposite sides. Three connecting rods are spaced at fixed intervals around the central axis of the same mounting plate. A mating plate is fixedly connected to the end of each connecting rod away from the mounting plate. A threaded rod is rotatably connected through the inner surface of the mating plate. The end of the threaded rod away from the mating plate is rotatably connected through the inner surface of the mounting plate. A transmission rod is meshed with the outer surface of the threaded rod near the mounting plate via gears. Both ends of the transmission rod are rotatably connected through the two mounting plates, and the transmission rod links the threaded rods on the two mounting plates.

[0009] Preferably, a second motor is fixedly connected to the inner surface of the mounting plate, wherein the second motor fixes the two mounting plates, and the output end of the second motor is rotatably connected to the end of the top threaded rod near the mounting plate.

[0010] Preferably, a movable plate is slidably sleeved on the outer surface of the connecting rod, the movable plate is threadedly connected to the threaded rod, a first stabilizing rod is hinged to the side surface of the movable plate, and three first stabilizing rods are fixedly spaced around the central axis of the same movable plate, with the end of the first stabilizing rod away from the movable plate hinged to the outer surface of the support rod.

[0011] Preferably, a resistance ring is fixedly connected to the outer surface of the roller. The resistance ring is made of rubber material, and the interior of the resistance ring is hollow. A reinforcing ring is fixedly connected to the inner surface of the resistance ring. The reinforcing ring is an elastic ring, and an expansion ring is fixedly connected to the inner surface of the reinforcing ring. The expansion ring is made of rubber material.

[0012] Preferably, support rings are symmetrically arranged on both sides of the expansion ring, the inner end of the support ring is fixedly connected to the outer surface of the roller, and the side of the support ring away from the roller is fixedly connected to the inner surface of the reinforcing ring.

[0013] Preferably, the painting mechanism includes a material storage tube, the two ends of which are fixedly connected to the inner surfaces of two mounting plates, wherein the material storage tube is configured as a near-circular shape and is located on the outside of the second motor.

[0014] Preferably, the outer surface of the bottom mating plate is hinged with a spray pipe, and three spray pipes are fixedly spaced around the central axis of the mating plate. A spray head is fixedly installed at the end of the spray pipe away from the mating plate. A collar is slidably sleeved on the outer surface of the spray pipe, and a second stabilizing rod is hinged on the outer surface of the collar. The end of the second stabilizing rod away from the collar is hinged to the outer surface of the support rod, wherein the spray pipe and the support rod are arranged parallel to each other.

[0015] Preferably, an expansion bladder is fixedly connected to the inner surface of the injection pipe near the mating plate, a pusher plate is fixedly connected to the outer surface of the expansion bladder, an installation rod is fixedly connected to the surface of the pusher plate away from the expansion bladder, a stabilizing frame is fixedly connected to the end of the installation rod away from the pusher plate, the stabilizing frame is slidably connected to the inner surface of the injection pipe, a first misalignment plate is fixedly connected to the outer surface of the installation rod, five first misalignment plates are arranged at fixed intervals along the outer surface of the installation rod, a first misalignment hole is opened through the surface of the first misalignment plate, a second misalignment plate is fixedly connected to the inner surface of the injection pipe, six second misalignment plates are arranged at fixed intervals around the inner surface of the injection pipe, a second misalignment hole is opened through the surface of the second misalignment plate, wherein the first misalignment hole and the second misalignment hole are misaligned, and the injection pipe is connected to the storage pipe.

[0016] Preferably, a pressing plate is fixedly connected to the surface of the bottom movable plate near the mounting plate, and a pressing bladder is fixedly connected to the surface of the pressing plate. The pressing bladder is located on the outside of the threaded rod, and a positioning plate is fixedly connected to the end of the pressing bladder away from the pressing plate. The positioning plate is fixedly sleeved on the outer surface of the bottom connecting rod. The internal cavity of the pressing bladder communicates with the expansion bladder and the internal cavity of the pressing bladder communicates with the expansion ring. When it is necessary to paint the pipe fitting, the entire device can be placed into the pipe fitting. Then, the second motor is started. The start of the second motor will drive the threaded rod to rotate, and the two threaded rods are driven by the transmission rod, so that the movable plates on both sides begin to move inward along the threaded rods on both sides. Then, the first stabilizing rod drives the support rod to expand outward, so that the rollers on the support rod are pressed against the inner surface of the pipe fitting. At this time, the first motor is started. When the first motor starts, it will drive the rollers to rotate, so that the friction between the rollers and the pipe fitting will drive the entire device to move on the inner surface of the pipe fitting. During the movement, the painting mechanism completes the painting operation on the inner surface of the pipe fitting.

[0017] This invention provides an internal painting device for large-diameter butt-welded pipe fittings. It has the following beneficial effects:

[0018] 1. This internal painting equipment for large-diameter butt-welded pipe fittings features adjustable support rods, allowing the expansion angle of the support rods to be adjusted. This enables the equipment to adapt to pipe fittings of different diameters, greatly improving its applicability. When the angle of the support rods changes, the second stabilizing rod will cause the spray pipe to expand and contract, ensuring that the distance between the nozzle on the spray pipe and the inner surface of different pipe fittings remains constant. This significantly improves the working stability of the equipment and ensures the quality of the painting.

[0019] 2. In this large-diameter butt-welded pipe internal painting equipment, when the moving plate moves towards the mounting plate, it also squeezes the extrusion bladder through the extrusion plate. This causes the extrusion bladder to transfer its internal air pressure to the expansion bladder in the spray pipe, causing the expansion bladder to expand in the spray pipe. This, in turn, pushes the push plate to move, causing the mounting rod to move towards the spray head. This causes the first misalignment plate to move, and when the first misalignment plate moves, the distance between the first and second misalignment plates increases, thus increasing the distance between the first and second misalignment holes. This allows the total amount of protective paint delivered by the spray pipe to be increased simultaneously when the spray pipe rotates outward. In other words, this equipment can adjust the amount of protective paint sprayed according to the rotation of pipes with different diameters, achieving an adjustable effect. This ensures that a complete painting operation can still be performed when the pipe diameter is large, while also avoiding the problem of excessive protective paint spraying and painting quality issues when the pipe diameter is small.

[0020] 3. In this large-diameter butt-welded pipe fitting internal painting equipment, when the rollers begin to contact the inner surface of the pipe fitting, the resistance ring also begins to contact the inner surface of the pipe fitting. As the No. 2 motor continues to operate, the pressure between the resistance ring and the inner surface of the pipe fitting gradually increases, causing the resistance ring to deform. Through the reinforcing ring's supporting effect, the outer surface of the resistance ring gradually tends towards a flat surface, thereby significantly increasing the friction between the resistance ring and the pipe fitting. This significantly increases the friction between the equipment and the pipe fitting, especially when the pipe fitting is large, ensuring smooth operation. When the pipe is large, this equipment can move stably within the pipe wall, avoiding relative sliding between the rollers and the pipe wall, which would make movement difficult and reduce painting stability. It also avoids painting quality problems caused by the equipment stopping inside the pipe. The expansion ring on the inner surface of the reinforcing ring is connected to the extrusion bladder, so that when the pipe is large, the extrusion bladder can simultaneously compensate for some of the air pressure in the expansion bladder. This causes the expansion bladder to generate a reverse extrusion force on the reinforcing ring, thereby putting the resistance ring and the inner wall of the pipe in a balanced extrusion state. This not only improves the painting quality but also enhances the working stability of the equipment. Attached Figure Description

[0021] Figure 1 This is the front view of the present invention;

[0022] Figure 2 This is a schematic diagram of the threaded rod of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of the No. 2 motor of the present invention;

[0024] Figure 4 This is a schematic diagram of the transmission rod of the present invention;

[0025] Figure 5This is a schematic diagram of the structure of the injection tube of the present invention;

[0026] Figure 6 This is a schematic diagram of the internal structure of the injection tube of the present invention;

[0027] Figure 7 This is a schematic diagram of the resistance ring structure of the present invention;

[0028] Figure 8 This is a schematic diagram of the expansion ring structure of the present invention.

[0029] In the diagram: 1. Mounting plate; 2. Support rod; 3. Roller; 4. Motor No. 1; 5. Adjustment mechanism; 51. Connecting rod; 52. Mating plate; 53. Threaded rod; 54. Transmission rod; 55. Motor No. 2; 56. Moving plate; 57. Stabilizing rod No. 1; 58. Resistance ring; 59. Reinforcing ring; 510. Expansion ring; 511. Support ring; 6. Painting mechanism; 61. Material storage pipe; 62. Spray pipe; 63. Spray head; 64. Collar; 65. Stabilizing rod No. 2; 66. Expansion bladder; 67. Push plate; 68. Mounting rod; 69. Stabilizing frame; 610. Misalignment plate No. 1; 611. Misalignment hole No. 1; 612. Misalignment plate No. 2; 613. Misalignment hole No. 2; 614. Extrusion plate; 615. Extrusion bladder; 616. Positioning plate. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] First embodiment: as follows Figures 1 to 8 As shown, the present invention provides a technical solution: an internal painting device for large-diameter butt-welded pipe fittings, including mounting plates 1, two mounting plates 1 arranged parallel to each other, support rods 2 rotatably connected to the side surfaces of the two mounting plates 1, three support rods 2 arranged at fixed intervals around the central axis of the same mounting plate 1, and rollers 3 rotatably connected to the end of the support rods 2 away from the mounting plate 1, wherein the support rods 2 on the two mounting plates 1 are arranged opposite to each other, and a first motor 4 is fixedly connected to the outer surface of the support rods 2, wherein the rollers 3 and the output end of the first motor 4 mesh with each other, and the device further includes:

[0032] Adjustment mechanism 5 is fixedly installed on both sides of the mounting plate 1. Adjustment mechanism 5 controls the opening and closing angle of support rod 2.

[0033] The painting mechanism 6 is fixedly installed on the adjustment mechanism 5, and the painting mechanism 6 works in conjunction with the adjustment mechanism 5.

[0034] The adjusting mechanism 5 includes a connecting rod 51, which is fixedly connected to the surfaces of two mounting plates 1 on opposite sides. Three connecting rods 51 are fixedly spaced around the central axis of the same mounting plate 1. A mating plate 52 is fixedly connected to the end of the connecting rod 51 away from the mounting plate 1. A threaded rod 53 is rotatably connected through the inner surface of the mating plate 52. The end of the threaded rod 53 away from the mating plate 52 is rotatably connected through the inner surface of the mounting plate 1. A transmission rod 54 is meshed with the outer surface of the threaded rod 53 near the mounting plate 1 via gears. Both ends of the transmission rod 54 are rotatably connected through the two mounting plates 1, and the transmission rod 54 links the threaded rods 53 on the two mounting plates 1.

[0035] A second motor 55 is fixedly connected to the inner surface of the mounting plate 1. The second motor 55 fixes the two mounting plates 1, and the output end of the second motor 55 is rotatably connected to the end of the top threaded rod 53 near the mounting plate 1.

[0036] A movable plate 56 is slidably sleeved on the outer surface of the connecting rod 51. The movable plate 56 is threadedly connected to the threaded rod 53. A first stabilizing rod 57 is hinged to the side surface of the movable plate 56. Three first stabilizing rods 57 are fixedly spaced around the central axis of the same movable plate 56. The end of the first stabilizing rod 57 away from the movable plate 56 is hinged to the outer surface of the support rod 2.

[0037] A resistance ring 58 is fixedly connected to the outer surface of the roller 3. The resistance ring 58 is made of rubber material and is hollow inside. A reinforcing ring 59 is fixedly connected to the inner surface of the resistance ring 58. The reinforcing ring 59 is an elastic ring. An expansion ring 510 is fixedly connected to the inner surface of the reinforcing ring 59. The expansion ring 510 is made of rubber material.

[0038] Support rings 511 are symmetrically arranged on both sides of the expansion ring 510. The inner end of the support ring 511 is fixedly connected to the outer surface of the roller 3, and the side of the support ring 511 away from the roller 3 is fixedly connected to the inner surface of the reinforcing ring 59.

[0039] Second embodiment: as follows Figures 1 to 8 As shown, the painting mechanism 6 includes a material storage tube 61, with both ends of the material storage tube 61 fixedly connected to the inner surfaces of two mounting plates 1. The material storage tube 61 is configured as a near-circular shape and is located outside the second motor 55.

[0040] A spray pipe 62 is hinged to the outer surface of the bottom mating plate 52. Three spray pipes 62 are fixedly spaced around the central axis of the mating plate 52. A spray head 63 is fixedly installed at the end of the spray pipe 62 away from the mating plate 52. A collar 64 is slidably sleeved on the outer surface of the spray pipe 62. A second stabilizing rod 65 is hinged to the outer surface of the collar 64. The end of the second stabilizing rod 65 away from the collar 64 is hinged to the outer surface of the support rod 2. The spray pipe 62 and the support rod 2 are arranged parallel to each other.

[0041] An expansion bladder 66 is fixedly connected to the inner surface of the injection pipe 62 near the mating plate 52. A pusher plate 67 is fixedly connected to the outer surface of the expansion bladder 66. A mounting rod 68 is fixedly connected to the surface of the pusher plate 67 away from the expansion bladder 66. A stabilizing frame 69 is fixedly connected to the end of the mounting rod 68 away from the pusher plate 67. The stabilizing frame 69 is slidably connected to the inner surface of the injection pipe 62. A first misalignment plate 610 is fixedly connected to the outer surface of the mounting rod 68. Five first misalignment plates 610 are arranged at fixed intervals along the outer surface of the mounting rod 68. A first misalignment hole 611 is opened through the surface of the first misalignment plate 610. A second misalignment plate 612 is fixedly connected to the inner surface of the injection pipe 62. Six second misalignment plates 612 are arranged at fixed intervals around the inner surface of the injection pipe 62. A second misalignment hole 613 is opened through the surface of the second misalignment plate 612. The first misalignment hole 611 and the second misalignment hole 613 are misaligned. The injection pipe 62 is connected to the storage pipe 61.

[0042] A compression plate 614 is fixedly connected to the surface of the bottom movable plate 56 near the mounting plate 1. A compression bladder 615 is fixedly connected to the surface of the compression plate 614. The compression bladder 615 is located on the outside of the threaded rod 53. A positioning plate 616 is fixedly connected to the end of the compression bladder 615 away from the compression plate 614. The positioning plate 616 is fixedly sleeved on the outer surface of the bottom connecting rod 51. The internal cavity of the compression bladder 615 communicates with the expansion bladder 66. The internal cavity of the compression bladder 615 also communicates with the expansion ring 510.

[0043] During operation, when painting is required on the pipe fitting, the entire device is placed inside the fitting. Then, motor 2 (55) is started. Starting motor 2 (55) rotates the threaded rods 53. The two threaded rods 53, driven by transmission rod 54, cause the moving plates 56 on both sides to move inward along the threaded rods 53. This, in turn, drives the support rod 2 outward through the stabilizing rod 57, ultimately causing the rollers 3 on the support rod 2 to press against the inner surface of the pipe fitting. At this point, motor 4 (4) is started. Starting motor 4 rotates the rollers 3, and the friction between the rollers 3 and the pipe fitting causes the entire device to move along the inner surface of the pipe fitting. During this movement, the painting mechanism 6 completes the painting operation on the inner surface of the pipe fitting. The adjustable support rod 2 allows for adjustable deployment angles, enabling the equipment to adapt to pipe fittings of different diameters and greatly improving its applicability. When the angle of the support rod 2 changes, it also drives the spray pipe 62 to expand and contract via the second stabilizing rod 65, ensuring a constant distance between the nozzle on the spray pipe 62 and the inner surface of different pipe fittings. This significantly improves the equipment's operational stability and ensures painting quality. When the moving plate 56 moves towards the mounting plate 1, it also compresses the compression bladder 615 via the compression disc 614, causing the compression bladder 615 to transfer its internal air pressure to the expansion bladder 66 in the spray pipe 62. This causes the expansion bladder 66 to expand within the spray pipe 62, thus pushing the push disc. Movement 67 causes the mounting rod 68 to move towards the spray head 63, thus causing the first misalignment disc 610 to move. When the first misalignment disc 610 moves, the distance between it and the second misalignment disc 612 increases, thereby increasing the distance between the first misalignment hole 611 and the second misalignment hole 613. This simultaneously enhances the total amount of protective paint delivered by the spray pipe 62 as it rotates outward. In other words, this equipment can adjust the amount of protective paint sprayed according to the pipe diameter, achieving an adjustable effect. This ensures that a complete painting operation can still be performed even with a large pipe diameter, while avoiding the problem of excessive protective paint spraying leading to painting quality issues when the pipe diameter is small. When roller 3 opens... When the resistance ring 58 first contacts the inner surface of the pipe fitting, the pressure between the resistance ring 58 and the inner surface of the pipe fitting gradually increases as the second motor 55 continues to operate. This causes the resistance ring 58 to begin to deform under pressure. Through the supporting effect of the reinforcing ring 59, the outer surface of the resistance ring 58 gradually becomes more planar, thereby significantly increasing the friction between the resistance ring 58 and the pipe fitting. This significantly increases the friction between the equipment and the pipe fitting, especially when the pipe fitting is large. This ensures that the equipment can move stably on the inner wall of the pipe fitting when the pipe fitting is large, preventing relative sliding between the roller 3 and the inner wall of the pipe fitting, which would make the equipment difficult to move and reduce the stability of the painting process.This also avoids paint quality issues caused by the equipment stopping inside the pipe. The expansion ring 510 on the inner surface of the reinforcing ring 59 is connected to the compression bladder 615, ensuring that even when the pipe is large, the compression bladder 615 can simultaneously compensate for some of the air pressure in the expansion bladder 66. This causes the expansion bladder 66 to generate a reverse compressive force on the reinforcing ring 59, thereby maintaining a balanced compression state between the resistance ring 58 and the inner wall of the pipe. This not only improves paint quality but also enhances the operational stability of the equipment.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. An internal painting device for large-diameter butt-welded pipe fittings, comprising a mounting plate (1), characterized in that: Two mounting plates (1) are arranged parallel to each other. Support rods (2) are rotatably connected to the side surfaces of the two mounting plates (1). Three support rods (2) are fixedly spaced around the central axis of the same mounting plate (1). A roller (3) is rotatably connected to the end of the support rod (2) away from the mounting plate (1). The support rods (2) on the two mounting plates (1) are arranged opposite to each other. A motor (4) is fixedly connected to the outer surface of the support rod (2). The roller (3) meshes with the output end of the motor (4). The system also includes: Adjustment mechanism (5), which is fixedly installed on both sides of the mounting plate (1), and controls the opening and closing angle of the support rod (2); The painting mechanism (6) is fixedly installed on the adjustment mechanism (5), and the painting mechanism (6) works in cooperation with the adjustment mechanism (5); The adjustment mechanism (5) includes a connecting rod (51), which is fixedly connected to the surfaces of two mounting plates (1) on opposite sides. Three connecting rods (51) are fixedly spaced around the central axis of the mounting plate (1) on the same mounting plate (1). A mating plate (52) is fixedly connected to the end of the connecting rod (51) away from the mounting plate (1). A threaded rod (53) is rotatably connected through the inner surface of the mating plate (52). The end of the threaded rod (53) away from the mating plate (52) is rotatably connected through the inner surface of the mounting plate (1). A transmission rod (54) is meshed with the outer surface of the threaded rod (53) near the mounting plate (1) by a gear. Both ends of the transmission rod (54) are rotatably connected through the two mounting plates (1). The transmission rod (54) links the threaded rods (53) on the two mounting plates (1). The outer surface of the connecting rod (51) is slidably sleeved with a movable plate (56), and the movable plate (56) is threadedly connected to the threaded rod (53). A first stabilizing rod (57) is hinged to the side surface of the movable plate (56). Three first stabilizing rods (57) are fixedly spaced around the central axis of the same movable plate (56). The end of the first stabilizing rod (57) away from the movable plate (56) is hinged to the outer surface of the support rod (2). The painting mechanism (6) includes a material storage tube (61), the two ends of which are fixedly connected to the surfaces of two mounting plates (1) that are close to each other, wherein the material storage tube (61) is configured as a near-circular shape; The outer surface of the bottom mating plate (52) is hinged with a spray pipe (62). Three spray pipes (62) are fixedly spaced around the central axis of the mating plate (52). A spray head (63) is fixedly installed at the end of the spray pipe (62) away from the mating plate (52). A collar (64) is slidably sleeved on the outer surface of the spray pipe (62). A second stabilizing rod (65) is hinged on the outer surface of the collar (64). The end of the second stabilizing rod (65) away from the collar (64) is hinged to the outer surface of the support rod (2). The spray pipe (62) and the support rod (2) are arranged parallel to each other. An expansion bladder (66) is fixedly connected to the inner surface of the injection pipe (62) near the mating plate (52). A pusher plate (67) is fixedly connected to the outer surface of the expansion bladder (66). An installation rod (68) is fixedly connected to the surface of the pusher plate (67) away from the expansion bladder (66). A stabilizer (69) is fixedly connected to the end of the installation rod (68) away from the pusher plate (67). The stabilizer (69) is slidably connected to the inner surface of the injection pipe (62). A misalignment plate (610) is fixedly connected to the outer surface of the installation rod (68). 10) Five misaligned discs are fixedly spaced along the outer surface of the mounting rod (68). A misaligned hole (611) is opened through the surface of the first misaligned disc (610). A second misaligned disc (612) is fixedly connected to the inner surface of the spray pipe (62). Six misaligned holes (613) are fixedly spaced around the inner surface of the spray pipe (62). A second misaligned hole (613) is opened through the surface of the second misaligned disc (612). The first misaligned hole (611) and the second misaligned hole (613) are misaligned. The spray pipe (62) is connected to the storage pipe (61). A compression plate (614) is fixedly connected to the surface of the bottom movable plate (56) near the mounting plate (1). A compression bladder (615) is fixedly connected to the surface of the compression plate (614). The compression bladder (615) is located on the outside of the threaded rod (53). A positioning plate (616) is fixedly connected to the end of the compression bladder (615) away from the compression plate (614). The positioning plate (616) is fixedly sleeved on the outer surface of the bottom connecting rod (51). The internal cavity of the compression bladder (615) communicates with the expansion bladder (66).

2. The internal painting equipment for large-diameter butt-welded pipe fittings according to claim 1, characterized in that: A second motor (55) is fixedly connected to the surface of the two mounting plates (1) on one side close to each other. The second motor (55) fixes the two mounting plates (1) and the output end of the second motor (55) is rotatably connected to the end of the top threaded rod (53) near the mounting plate (1).

3. The internal painting equipment for large-diameter butt-welded pipe fittings according to claim 2, characterized in that: A resistance ring (58) is fixedly connected to the outer surface of the roller (3). The resistance ring (58) is made of rubber material. The interior of the resistance ring (58) is hollow. A reinforcing ring (59) is fixedly connected to the inner surface of the resistance ring (58). The reinforcing ring (59) is an elastic ring. An expansion ring (510) is fixedly connected to the inner surface of the reinforcing ring (59). The expansion ring (510) is made of rubber material.

4. The internal painting equipment for large-diameter butt-welded pipe fittings according to claim 3, characterized in that: Support rings (511) are symmetrically arranged on both sides of the expansion ring (510). The inner end of the support ring (511) is fixedly connected to the outer surface of the roller (3), and the side of the support ring (511) away from the roller (3) is fixedly connected to the inner surface of the reinforcing ring (59).

5. The internal painting equipment for large-diameter butt-welded pipe fittings according to claim 4, characterized in that: The storage tube (61) is located on the outside of the second motor (55).

6. The internal painting equipment for large-diameter butt-welded pipe fittings according to claim 5, characterized in that: The internal cavity of the compression bladder (615) is also connected to the expansion ring (510).

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