Internal paint spraying equipment for large-diameter butt welding pipe fittings

Abstract

The invention relates to the technical field of pipe fitting paint spraying equipment, in particular to large-diameter butt welding pipe fitting interior paint spraying equipment which comprises two mounting plates, supporting rods are rotationally connected to the side surfaces of the two mounting plates, and the three supporting rods are arranged around the center axis of the same mounting plate at fixed intervals. The end, away from the mounting plate, of the supporting rod is rotationally connected with a roller, the outer surface of the supporting rod is fixedly connected with a first motor, and the roller is meshed with the output end of the first motor. By arranging the adjustable supporting rod, the unfolding angle of the supporting rod can be adjusted, then the device can adapt to pipe fittings with different pipe diameters, the applicability of the device is greatly improved, when the angle of the supporting rod changes, the spraying pipe can be driven to expand and contract through the second stabilizing rod, and the spraying effect is improved. And therefore, the distances between the nozzles on the spraying pipe and the inner surfaces of different pipe fittings are always kept fixed, the working stability of the equipment is greatly improved, and the paint spraying quality is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of pipe fitting painting equipment, in particular to internal painting equipment for large-diameter butt-welded pipe fittings. Background Art

[0002] In the field of pipe fitting 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 on the inside of pipe fittings after welding to prevent corrosion and wear of pipe fittings, improve durability and aesthetics, and ensure the safe and stable operation of pipe fittings in various industrial pipeline systems. It is crucial to the fluid transportation link in industries such as petroleum, chemical, and construction.

[0003] Traditional internal painting equipment for large-diameter butt-welded pipe fittings has many defects. First of all, the adaptability is poor. Structures such as support rods are often fixed or have a narrow adjustment range, which makes it difficult to adapt to pipe fittings of different diameters. Frequent equipment replacement or complex debugging is required, which increases costs and time consumption and reduces production efficiency. In addition, the stability of painting is insufficient, and the distance between the nozzle and the inner wall of the pipe fitting is difficult to be constant. When the pipe diameter changes, it is easy to cause problems such as uneven paint thickness and leakage, which affects product quality and protective effect. At the same time, the amount of paint spray is not well regulated and cannot be adjusted dynamically with the pipe diameter. It is easy to have insufficient paint at large pipe diameters and too much paint at small pipe diameters, resulting in defects such as sagging and accumulation, which reduces the qualified rate of painting. In addition, when the equipment moves inside the pipe fitting, the friction between the roller and the pipe fitting is unstable, and it is easy to slide and jam in large-diameter pipe fittings, interrupting the painting process and causing paint surface defects. It is difficult to meet the high-precision, high-efficiency, and high-quality production requirements of pipe fitting processing, and it is urgent to optimize and upgrade. Summary of the invention

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

[0005] To achieve the above purpose, the present invention is implemented through the following technical solutions: an internal painting device for large-diameter butt-welded pipe fittings, comprising a mounting plate, wherein two mounting plates are arranged parallel to each other, and the side surfaces of the two mounting plates are rotatably connected with support rods, and three support rods are arranged at fixed intervals around the central axis of the same mounting plate, and one end of the support rod away from the mounting plate is rotatably connected with a roller, wherein the support rods on the two mounting plates are arranged oppositely, and the outer surface of the support rod is fixedly connected to a No. 1 motor, wherein the roller is meshed with the output end of the No. 1 motor, and further comprising: An adjustment mechanism, which is fixedly mounted on the two side surfaces of the mounting plate and controls the opening and closing angles of the support rods; A paint spraying mechanism, wherein the paint spraying mechanism is fixedly mounted on the adjusting mechanism and the paint spraying mechanism cooperates with the adjusting mechanism; The adjusting mechanism comprises a connecting rod, wherein the connecting rod is fixedly connected to the surfaces of the two mounting plates away from each other, wherein three connecting rods are arranged on the same mounting plate at fixed intervals around the central axis of the mounting plate, and the end of the connecting rod away from the mounting plate is fixedly connected to a matching plate, and a threaded rod is passed through and rotatably connected to the inner surface of the matching plate, and the end of the threaded rod away from the matching plate is passed through and rotatably connected to the inner surface of the mounting plate, and a transmission rod is meshed with a gear on the outer surface of the threaded rod close to one end of the mounting plate, and the two ends of the transmission rod are respectively passed through and rotatably connected to the two mounting plates, wherein the transmission rod links the threaded rods on the two mounting plates.

[0006] Preferably, a No. 2 motor is fixedly connected to the inner surface of the mounting plate, wherein the No. 2 motor fixes the two mounting plates, and the output end of the No. 2 motor is rotatably connected to one end of the top threaded rod close to the mounting plate.

[0007] Preferably, a movable plate is slidably sleeved on the outer surface of the connecting rod, and the movable plate is threadedly connected to the threaded rod. A No. 1 stabilizing rod is hingedly connected to the side surface of the movable plate, and three No. 1 stabilizing rods are arranged at fixed intervals around the central axis of the same movable plate. One end of the No. 1 stabilizing rod away from the movable plate is hinged to the outer surface of the support rod.

[0008] Preferably, a resistance ring is fixedly connected to the outer surface of the roller, the resistance ring is made of rubber material, the interior of the resistance ring is set to be hollow, the inner surface of the resistance ring is fixedly connected to a reinforcement ring, wherein the reinforcement ring is set to be an elastic ring, and the inner surface of the reinforcement ring is fixedly connected to an expansion ring, which is made of rubber material.

[0009] Preferably, support rings are symmetrically arranged on both sides of the expansion ring, the inner ends of the support rings are 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 reinforcement ring.

[0010] Preferably, the paint spraying mechanism includes a material storage tube, both ends of which are fixedly connected to the inner surfaces of the two mounting plates, wherein the material storage tube is configured in a nearly ring shape, and the material storage tube is disposed on the outside of the second motor.

[0011] Preferably, a spray tube is hinged on the outer surface of the matching plate at the bottom, and three spray tubes are arranged at fixed intervals around the central axis of the matching plate. A spray head is fixedly installed on the end of the spray tube away from the matching plate, and a ring is slidably sleeved on the outer surface of the spray tube. A No. 2 stabilizing rod is hinged on the outer surface of the ring, and the end of the No. 2 stabilizing rod away from the ring is hinged to the outer surface of the support rod, wherein the spray tube and the support rod are arranged parallel to each other.

[0012] Preferably, the inner surface of the injection tube close to one end of the matching plate is fixedly connected with an expansion bag, the outer surface of the expansion bag is fixedly connected with a pushing plate, the surface of the pushing plate away from the expansion bag is fixedly connected with a mounting rod, the end of the mounting rod away from the pushing plate is fixedly connected with a stabilizing frame, the stabilizing frame is slidably connected to the inner surface of the injection tube, the outer surface of the mounting rod is fixedly connected with a No. 1 offset disk, five of the No. 1 offset disks are arranged at fixed intervals along the outer surface of the mounting rod, a No. 1 offset hole is penetrated through the surface of the No. 1 offset disk, the inner surface of the injection tube is fixedly connected with a No. 2 offset disk, six of the No. 2 offset disks are arranged at fixed intervals around the inner surface of the injection tube, the surface of the No. 2 offset disk is penetrated with No. 2 offset holes, wherein the No. 1 offset hole and the No. 2 offset hole are offset, and the injection tube is connected to the storage tube.

[0013] Preferably, a squeeze disk is fixedly connected to the surface of the movable plate at the bottom close to the mounting plate, and a squeeze bag is fixedly connected to the surface of the squeeze disk, the squeeze bag is arranged on the outer side of the threaded rod, and a positioning disk is fixedly connected to the end of the squeeze bag away from the squeeze disk, and the positioning disk is fixedly sleeved on the outer surface of the bottom connecting rod, the internal cavity of the squeeze bag is communicated with the expansion bag, and the internal cavity of the squeeze bag is communicated with the expansion ring at the same time. When it is necessary to spray paint the pipe fitting, the device as a whole can be placed in the pipe fitting, and then the No. 2 motor is started. The start of the No. 2 motor will drive the threaded rod to rotate, and the two threaded rods are driven by the transmission rod, that is, the movable plates on both sides start to move inward along the threaded rods on both sides, and then the support rod is driven to expand outward through the No. 1 stabilizing rod, that is, the roller on the support rod is finally squeezed and fitted on the inner surface of the pipe fitting, and the No. 1 motor is started at this time. When the No. 1 motor is started, the roller will be driven to rotate, so that the friction between the roller and the pipe fitting drives the device as a whole to move on the inner surface of the pipe fitting, and the painting operation on the inner surface of the pipe fitting is completed through the painting mechanism during the movement.

[0014] The present invention provides an internal painting device for large-diameter butt-welded pipe fittings. It has the following beneficial effects: 1. The internal painting equipment for large-diameter butt-welded pipe fittings can adjust the expansion angle of the support rod by setting an adjustable support rod, so that the equipment can be adapted to pipe fittings of different diameters, which greatly improves the applicability of the equipment. When the angle of the support rod changes, the second stabilizing rod will also drive the injection pipe to expand and contract, so that the distance between the nozzle on the injection pipe and the inner surface of different pipe fittings is always kept fixed, thereby greatly improving the working stability of the equipment and ensuring the quality of painting.

[0015] 2. The internal painting equipment of the large-diameter butt-welded pipe fittings will squeeze the extrusion bag through the extrusion plate when the movable plate moves toward the side of the mounting plate, so that the extrusion bag transmits its internal air pressure to the expansion bag in the injection pipe, so that the expansion bag expands in the injection pipe, and then begins to push the push plate to move, that is, the mounting rod begins to move toward the side of the injection head, so that the No. 1 offset plate begins to move, and when the No. 1 offset plate begins to move, the distance between the No. 1 offset plate and the No. 2 offset plate begins to increase, thereby increasing the distance between the No. 1 offset hole and the No. 2 offset hole, thereby achieving the synchronous enhancement of the total amount of protective paint delivered by the injection pipe when the injection pipe rotates outward, that is, the equipment can adjust the spray amount of protective paint according to the rotation of pipe fittings of different diameters, thereby achieving an adjustable effect, ensuring that a complete painting operation can still be carried out when the pipe diameter is large, while also avoiding the problem of painting quality caused by a large amount of protective paint sprayed when the pipe diameter is small.

[0016] 3. For the internal painting equipment of large-diameter butt-welded pipe fittings, when the roller starts to contact the inner surface of the pipe fitting, the resistance ring starts to contact the inner surface of the pipe fitting, and as the No. 2 motor continues to work, the extrusion pressure between the resistance ring and the inner surface of the pipe fitting gradually increases, and then the resistance ring begins to be squeezed and deformed. By enhancing the supporting effect of the ring, the outer surface of the resistance ring gradually tends to be flat, thereby greatly increasing the friction between the resistance ring and the pipe fitting, thereby achieving a significant increase in the friction between the equipment and the pipe fitting by increasing the friction between the resistance ring and the inner wall of the pipe fitting when the pipe fitting is large, thereby ensuring that the resistance ring is smooth and stable when the pipe fitting is large. When the pipe is large, the device can move stably on the inner wall of the pipe to avoid relative sliding between the roller and the inner wall of the pipe, which makes it difficult to move the device and reduces the stability of painting. It also avoids the problem of painting quality caused by the device stopping in the pipe. The expansion ring on the inner surface of the reinforcement ring is connected with the extrusion bag, so that when the pipe is large, the extrusion bag can simultaneously make up for part of the air pressure for the expansion bag, so that the expansion bag produces a reverse extrusion force on the reinforcement ring, thereby making the resistance ring and the inner wall of the pipe in a balanced extrusion state, which not only improves the quality of painting, but also improves the working stability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view of the present invention; Figure 2 It is a structural schematic diagram of the threaded rod of the present invention; Figure 3 It is a structural schematic diagram of the second motor of the present invention; Figure 4 It is a structural schematic diagram of the transmission rod of the present invention; Figure 5 It is a schematic diagram of the structure of the injection pipe of the present invention; Figure 6 It is a schematic diagram of the internal structure of the injection pipe of the present invention; Figure 7 It is a structural schematic diagram of the resistance ring of the present invention; Figure 8 It is a structural schematic diagram of the expansion ring of the present invention.

[0018] In the figure: 1. mounting plate; 2. support rod; 3. roller; 4. No. 1 motor; 5. adjustment mechanism; 51. connecting rod; 52. matching plate; 53. threaded rod; 54. transmission rod; 55. No. 2 motor; 56. moving plate; 57. No. 1 stabilizing rod; 58. resistance ring; 59. reinforcement ring; 510. expansion ring; 511. support ring; 6. paint spraying mechanism; 61. storage tube; 62. injection tube; 63. injection head; 64. sleeve ring; 65. No. 2 stabilizing rod; 66. expansion bag; 67. push plate; 68. mounting rod; 69. stabilizing frame; 610. No. 1 offset plate; 611. No. 1 offset hole; 612. No. 2 offset plate; 613. No. 2 offset hole; 614. extrusion plate; 615. extrusion bag; 616. positioning plate. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] First embodiment: Figures 1 to 8 As shown, the present invention provides a technical solution: an internal painting device for a large-diameter butt-welded pipe fitting, comprising a mounting plate 1, two mounting plates 1 are arranged parallel to each other, the side surfaces of the two mounting plates 1 are rotatably connected with support rods 2, three support rods 2 are arranged at fixed intervals around the central axis of the same mounting plate 1, and one end of the support rod 2 away from the mounting plate 1 is rotatably connected with a roller 3, wherein the support rods 2 on the two mounting plates 1 are arranged oppositely, and the outer surface of the support rod 2 is fixedly connected to a No. 1 motor 4, wherein the roller 3 and the output end of the No. 1 motor 4 are meshed with each other, and further comprising: The adjusting mechanism 5 is fixedly mounted on the two side surfaces of the mounting plate 1, and the adjusting mechanism 5 controls the opening and closing angles of the support rod 2; A paint spraying mechanism 6, which is fixedly mounted on the adjusting mechanism 5, and the paint spraying mechanism 6 cooperates with the adjusting mechanism 5; The adjusting mechanism 5 includes a connecting rod 51, which is fixedly connected to the surfaces of the two mounting plates 1 away from each other, wherein three connecting rods 51 are arranged on the same mounting plate 1 at fixed intervals around the central axis of the mounting plate 1, and the end of the connecting rod 51 away from the mounting plate 1 is fixedly connected to a matching plate 52, and a threaded rod 53 is penetrated and rotatably connected to the inner surface of the mounting plate 1 through the inner surface of the threaded rod 53 away from the matching plate 52, and the outer surface of the threaded rod 53 close to the mounting plate 1 is meshed with a transmission rod 54 through a gear, and the two ends of the transmission rod 54 are respectively penetrated and rotatably connected to the two mounting plates 1, wherein the transmission rod 54 links the threaded rods 53 on the two mounting plates 1.

[0021] A second motor 55 is fixedly connected to the inner surface of the mounting plate 1 , wherein the second motor 55 fixes the two mounting plates 1 , and the output end of the second motor 55 is rotatably connected to one end of the top threaded rod 53 close to the mounting plate 1 .

[0022] A movable plate 56 is slidably sleeved on the outer surface of the connecting rod 51, and the movable plate 56 is threadedly connected to the threaded rod 53. A No. 1 stabilizing rod 57 is hingedly connected to the side surface of the movable plate 56. Three No. 1 stabilizing rods 57 are arranged at fixed intervals around the central axis of the same movable plate 56, and one end of the No. 1 stabilizing rod 57 away from the movable plate 56 is hingedly connected to the outer surface of the support rod 2.

[0023] A resistance ring 58 is fixedly connected to the outer surface of the roller 3, and the resistance ring 58 is made of rubber material. The interior of the resistance ring 58 is set to be hollow, and a reinforcement ring 59 is fixedly connected to the inner surface of the resistance ring 58, wherein the reinforcement ring 59 is set to be an elastic ring, and an expansion ring 510 is fixedly connected to the inner surface of the reinforcement ring 59, and the expansion ring 510 is made of rubber material.

[0024] Support rings 511 are symmetrically arranged on both sides of the expansion ring 510 . The inner ends of the support rings 511 are 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 reinforcement ring 59 .

[0025] Second embodiment: Figures 1 to 8 As shown, the paint spraying mechanism 6 includes a storage tube 61, both ends of which are fixedly connected to the inner surfaces of the two mounting plates 1, wherein the storage tube 61 is configured to be nearly annular, and the storage tube 61 is disposed on the outside of the second motor 55.

[0026] The outer surface of the bottom matching plate 52 is hinged with a spray tube 62, and three spray tubes 62 are arranged at fixed intervals around the central axis of the matching plate 52. An injection head 63 is fixedly installed on the end of the spray tube 62 away from the matching plate 52, and a ring 64 is slidably sleeved on the outer surface of the spray tube 62. The outer surface of the ring 64 is hinged with a No. 2 stabilizing rod 65, and the end of the No. 2 stabilizing rod 65 away from the ring 64 is hinged to the outer surface of the support rod 2, wherein the spray tube 62 and the support rod 2 are arranged parallel to each other.

[0027] An expansion bag 66 is fixedly connected to the inner surface of the injection pipe 62 near the matching plate 52, and a pushing plate 67 is fixedly connected to the outer surface of the expansion bag 66. A mounting rod 68 is fixedly connected to the surface of the pushing plate 67 away from the expansion bag 66. A stabilizing frame 69 is fixedly connected to the end of the mounting rod 68 away from the pushing plate 67. The stabilizing frame 69 is slidably connected to the inner surface of the injection pipe 62. A No. 1 misaligned disk 610 is fixedly connected to the outer surface of the mounting rod 68. Five No. 1 misaligned disks 610 are arranged at fixed intervals along the outer surface of the mounting rod 68. A No. 1 misaligned hole 611 is penetrated through the surface of the No. 1 misaligned disk 610. A No. 2 misaligned disk 612 is fixedly connected to the inner surface of the injection pipe 62. Six No. 2 misaligned disks 612 are arranged at fixed intervals around the inner surface of the injection pipe 62. A No. 2 misaligned hole 613 is penetrated through the surface of the No. 2 misaligned disk 612, wherein the No. 1 misaligned hole 611 is misaligned with the No. 2 misaligned hole 613. The injection pipe 62 is connected to the storage pipe 61.

[0028] The surface of the bottom movable plate 56 close to the mounting plate 1 is fixedly connected with an extrusion plate 614, the surface of the extrusion plate 614 is fixedly connected with an extrusion bag 615, the extrusion bag 615 is arranged on the outside of the threaded rod 53, the end of the extrusion bag 615 away from the extrusion plate 614 is fixedly connected with a positioning plate 616, the positioning plate 616 is fixedly sleeved on the outer surface of the bottom connecting rod 51, the internal cavity of the extrusion bag 615 is connected with the expansion bag 66, and the internal cavity of the extrusion bag 615 is also connected with the expansion ring 510.

[0029] During operation, when it is necessary to spray paint on the pipe fitting, the whole device can be placed in the pipe fitting, and then the No. 2 motor 55 is started. The start of the No. 2 motor 55 will drive the threaded rod 53 to rotate, and the two threaded rods 53 are driven by the transmission rod 54, that is, the moving plates 56 on both sides begin to move inward along the threaded rods 53 on both sides, and then the No. 1 stabilizing rod 57 drives the support rod 2 to expand outward, that is, finally the roller 3 on the support rod 2 is squeezed and fitted on the inner surface of the pipe fitting, and the No. 1 motor 4 is started. When the No. 1 motor 4 is started, it will drive the roller 3 to rotate, so that the friction between the roller 3 and the pipe fitting drives the whole device to move on the inner surface of the pipe fitting, and completes the painting operation on the inner surface of the pipe fitting through the painting mechanism 6 during the movement. The adjustable support rod 2 can make the deployment angle of the support rod 2 adjustable, so that the device can be adapted to pipes of different diameters, which greatly improves the applicability of the device. When the angle of the support rod 2 changes, the second stabilizing rod 65 will also drive the injection tube 62 to expand and contract, so that the distance between the nozzle on the injection tube 62 and the inner surface of different pipes is always kept fixed, thereby greatly improving the working stability of the device and ensuring the quality of painting. When the moving plate 56 moves toward the side of the mounting plate 1, the extrusion bag 615 is squeezed through the extrusion disk 614, so that the extrusion bag 615 transmits its internal air pressure to the expansion bag 66 in the injection tube 62, so that the expansion bag 66 expands in the injection tube 62, and then starts to push the push disk 67 moves, that is, the mounting rod 68 starts to move toward the side of the spray head 63, so that the first offset disk 610 starts to move, and when the first offset disk 610 starts to move, the distance between the first offset disk 610 and the second offset disk 612 begins to increase, thereby increasing the distance between the first offset hole 611 and the second offset hole 613, so as to achieve the synchronous enhancement of the total amount of protective paint delivered by the spray pipe 62 when the spray pipe 62 rotates outward, that is, the device can adjust the spray amount of protective paint according to the rotation of pipes with different diameters, so as to achieve an adjustable effect, ensure that the complete painting operation can still be carried out when the pipe diameter is large, and also avoid the problem of paint quality caused by a large amount of protective paint sprayed when the pipe diameter is small, and when the roller 3 is turned on, the spraying amount of protective paint is adjusted according to the rotation of the pipes with different diameters, so as to achieve an adjustable effect, ensure that the complete painting operation can be carried out when the pipe diameter is large, and also avoid the problem of paint quality caused by a large amount of protective paint sprayed when the pipe diameter is small. When the resistance ring 58 starts to contact the inner surface of the pipe, the resistance ring 58 starts to contact the inner surface of the pipe, and as the second motor 55 continues to work, the extrusion pressure between the resistance ring 58 and the inner surface of the pipe gradually increases, so that the resistance ring 58 begins to be squeezed and deformed, and the outer surface of the resistance ring 58 gradually tends to be flat by reinforcing the supporting effect of the ring 59, thereby greatly improving the friction between the resistance ring 58 and the pipe, thereby achieving when the pipe is large, by increasing the friction between the resistance ring 58 and the inner wall of the pipe, the friction between the device and the pipe is greatly improved, thereby ensuring that when the pipe is large, the device can stably move on the inner wall of the pipe, avoiding relative sliding between the roller 3 and the inner wall of the pipe, resulting in difficulty in moving the device and reducing the stability of spraying.At the same time, it also avoids the problem of painting quality caused by the equipment stopping in the pipe. The expansion ring 510 on the inner surface of the reinforcement ring 59 is connected with the extrusion bag 615, so that when the pipe is large, the extrusion bag 615 can simultaneously make up for part of the air pressure for the expansion bag 66, so that the expansion bag 66 generates a reverse extrusion force on the reinforcement ring 59, thereby making the resistance ring 58 and the inner wall of the pipe in a balanced extrusion state, which not only improves the painting quality, but also improves the working stability of the equipment.

[0030] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by... does not exclude the existence of other identical elements in the process, method, article or device including the 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, and the side surfaces of the two mounting plates (1) are rotatably connected to support rods (2), and three support rods (2) are arranged at fixed intervals around the central axis of the same mounting plate (1), and one end of the support rod (2) away from the mounting plate (1) is rotatably connected to a roller (3), wherein the support rods (2) on the two mounting plates (1) are arranged opposite to each other, and the outer surface of the support rod (2) is fixedly connected to a first motor (4), wherein the roller (3) and the output end of the first motor (4) are meshed with each other, and further comprising: An adjustment mechanism (5), the adjustment mechanism (5) being fixedly mounted on two side surfaces of the mounting plate (1), and the adjustment mechanism (5) controlling the opening and closing angle of the support rod (2); A paint spraying mechanism (6), wherein the paint spraying mechanism (6) is fixedly mounted on the adjusting mechanism (5), and the paint spraying mechanism (6) cooperates with the adjusting mechanism (5); The adjustment mechanism (5) comprises a connecting rod (51), wherein the connecting rod (51) is fixedly connected to surfaces of two mounting plates (1) at a side away from each other, wherein three connecting rods (51) are arranged on the same mounting plate (1) at fixed intervals around the central axis of the mounting plate (1), wherein one end of the connecting rod (51) away from the mounting plate (1) is fixedly connected to a matching plate (52), wherein a threaded rod (53) is passed through and rotatably connected to the inner surface of the mounting plate (1), wherein one end of the threaded rod (53) away from the matching plate (52) is passed through and rotatably connected to the inner surface of the mounting plate (1), wherein an outer surface of an end of the threaded rod (53) close to the mounting plate (1) is meshed with a transmission rod (54) via a gear, wherein both ends of the transmission rod (54) are respectively passed through and rotatably connected to the two mounting plates (1), wherein the transmission rod (54) links the threaded rods (53) on the two mounting plates (1).

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

3. The internal painting equipment for large-diameter butt-welded pipe fittings according to claim 2 is characterized in that: A movable plate (56) is slidably sleeved on the outer surface of the connecting rod (51), and the movable plate (56) is threadedly connected to the threaded rod (53). A No. 1 stabilizing rod (57) is hingedly connected to the side surface of the movable plate (56), and three No. 1 stabilizing rods (57) are arranged at fixed intervals around the central axis of the same movable plate (56). One end of the No. 1 stabilizing rod (57) away from the movable plate (56) is hingedly connected to the outer surface of the support rod (2).

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

5. The internal painting equipment for large-diameter butt-welded pipe fittings according to claim 4 is characterized in that: Support rings (511) are symmetrically arranged on both sides of the expansion ring (510); the inner ends of the support rings (511) are 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 reinforcement ring (59).

6. The internal painting equipment for large-diameter butt-welded pipe fittings according to claim 5 is characterized in that: The paint spraying mechanism (6) comprises a material storage tube (61), the two ends of which are respectively fixedly connected to the inner surfaces of the two mounting plates (1), wherein the material storage tube (61) is arranged in a nearly annular shape, and the material storage tube (61) is arranged outside the second motor (55).

7. The internal painting equipment for large-diameter butt-welded pipe fittings according to claim 6 is characterized by: The outer surface of the matching plate (52) at the bottom is hinged with a spray pipe (62), three spray pipes (62) are arranged at fixed intervals around the central axis of the matching plate (52), one end of the spray pipe (62) away from the matching plate (52) is fixedly mounted with a spray head (63), the outer surface of the spray pipe (62) is slidably sleeved with a collar (64), the outer surface of the collar (64) is hinged with a second stabilizing rod (65), and one end of the second stabilizing rod (65) away from the collar (64) is hinged to the outer surface of the support rod (2), wherein the spray pipe (62) and the support rod (2) are arranged parallel to each other.

8. The internal painting equipment for large-diameter butt-welded pipe fittings according to claim 7 is characterized in that: An expansion bag (66) is fixedly connected to the inner surface of one end of the injection pipe (62) close to the matching plate (52), a push plate (67) is fixedly connected to the outer surface of the expansion bag (66), a mounting rod (68) is fixedly connected to the surface of the push plate (67) away from the expansion bag (66), an end of the mounting rod (68) away from the push plate (67) is fixedly connected to a stabilizing frame (69), the stabilizing frame (69) is slidably connected to the inner surface of the injection pipe (62), and a first misalignment plate (610) is fixedly connected to the outer surface of the mounting rod (68). The first misalignment plate (610) is fixedly connected to the outer surface of the mounting rod (68). 10) Five offset holes (611) are arranged at fixed intervals along the outer surface of the mounting rod (68); the surface of the first offset disk (610) is penetrated by a first offset hole (611); the inner surface of the injection pipe (62) is fixedly connected with a second offset disk (612); six offset holes (613) are arranged at fixed intervals around the inner surface of the injection pipe (62); the surface of the second offset disk (612) is penetrated by a second offset hole (613), wherein the first offset hole (611) and the second offset hole (613) are arranged in an offset manner; the injection pipe (62) is connected to the storage pipe (61).

9. The internal painting equipment for large-diameter butt-welded pipe fittings according to claim 8 is characterized in that: A pressing plate (614) is fixedly connected to the surface of the movable plate (56) at the bottom close to the mounting plate (1), and a pressing bag (615) is fixedly connected to the surface of the pressing plate (614). The pressing bag (615) is arranged on the outside of the threaded rod (53), and a positioning plate (616) is fixedly connected to the end of the pressing bag (615) away from the pressing plate (614). The positioning plate (616) is fixedly sleeved on the outer surface of the bottom connecting rod (51), and the internal cavity of the pressing bag (615) is communicated with the expansion bag (66), and the internal cavity of the pressing bag (615) is also communicated with the expansion ring (510).

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