Spraying device for steel pipe production

Abstract

The utility model discloses a spraying device for steel pipe production, which relates to the technical field of steel pipe spraying and comprises a base, a rotatable turntable is arranged on the upper side of the base, a plurality of groups of rotatable fixing components are movably arranged on the turntable, and eight groups of workbenches are arranged on the circumferential side of the base. And an input assembly, a first paint spraying assembly, a second paint spraying assembly, a third paint spraying assembly, a first drying assembly, a second drying assembly, a third drying assembly and an output assembly are sequentially arranged on the eight sets of workbenches in the clockwise direction with the axis of the rotary table as the axis. The device has the beneficial effect of improving the steel pipe spraying effect and efficiency.

Description

TECHNICAL FIELD

[0001] The utility model relates to steel pipe spraying technical field, concretely is a kind of spraying device for steel pipe production. BACKGROUND

[0002] Steel pipe is one of the most widely used hardware fittings in various buildings or equipment, and steel pipes will be subjected to special coating spraying treatment on their surfaces according to different purposes to improve their corrosion resistance, rust prevention ability and aesthetic appearance, etc.

[0003] The steel pipe spraying device with publication number CN220072065U includes a workbench and a rotating disc rotating at the center of the workbench, and the bottom of the rotating disc is connected with a driving motor whose output end is connected with the rotating disc, the top of the rotating disc is fixedly connected with a positioning column, the outer surface of the positioning column is inserted with a plug rod, and the outer surface of the plug rod is sleeved with a steel pipe to be sprayed.

[0004] The device drives the rotating disc to rotate at a uniform speed by the driving motor, so as to drive the steel pipe installed on the rotating disc to rotate at a uniform speed, and the rotating steel pipe can be automatically and uniformly sprayed by the paint pump, the spraying plate and the spray head arranged on one side of the workbench, but the device can only spray one steel pipe at a time, and manual assistance is needed to replace the steel pipe, which is low in work efficiency and cannot realize batch and continuous spraying of steel pipes. SUMMARY

[0005] The utility model aims at the existing technical defects, and provides a spraying device for steel pipe production to solve the problems in the background art.

[0006] To solve the above technical problems, the utility model provides the following technical scheme: a spraying device for steel pipe production, including base, the upper side of base is provided with rotatable rotary table, the rotary table is movably provided with a plurality of rotatable fixed assemblies, the circumferential side of base is arranged with eight workbenches, and the eight workbenches are sequentially provided with input assembly, first paint spraying assembly, second paint spraying assembly, third paint spraying assembly, first drying assembly, second drying assembly, third drying assembly and output assembly along clockwise direction with rotary table shaft as the shaft.

[0007] The utility model further illustrates, the fixed component includes the rotating drum, the cavity one is opened in the rotating drum, the movable cylinder is wrapped in the rotating drum, the cylinder slides in the cavity one along rotating drum axial direction, the fixed area for fixing the steel pipe of sleeve setting is formed in the rotating drum away from the one side of recess two, the circumference inner wall of fixed area of cavity one is equipped with several groups of cylindrical cavity, the one side of cylindrical cavity away from the axis of rotating drum is hemispherical cavity, the one side of hemispherical cavity of cylindrical cavity away from the axis of rotating drum is formed with the perforation that penetrates rotating drum, the top bead is all provided in each group cylindrical cavity, the part spherical surface of top bead is formed with the protrusion outside the wall of rotating drum through the perforation, the position of cylindrical cavity is opened on the outer wall of cylinder and is equipped with the limit groove that top bead is limited to move.

[0008] The utility model further illustrates, the radius R2 of perforation is less than the radius R1 of hemispherical cavity, and the wall thickness of rotating drum is less than the diameter of top bead.

[0009] The utility model further illustrates, the input component and output component structure same and all include the linear motor that sets up along the length direction of work table, the output end of linear motor is connected with the connecting plate, and the both ends of connecting plate along the width direction of work table are all provided with clamping component.

[0010] The utility model further illustrates, the clamping component includes the clamping plate that sets up vertically symmetry, and the one side of two groups clamping plate away from the symmetry center line is connected with hydraulic telescopic cylinder no.

[0011] The utility model further illustrates, the first paint spraying assembly, second paint spraying assembly, third paint spraying assembly structure same and all include three groups of spray pipes that set up parallel with each other along the length direction of work table, and a plurality of groups of paint spraying heads are all provided on three groups of spray pipes, and the input end of three groups of spray pipes is communicated with pump body and paint tank through hose.

[0012] The utility model further illustrates, the paint spraying head on the spray pipe of middle group is vertically set, and the paint spraying head on the spray pipe of the remaining two groups is inclined to the side close to the spray pipe of middle group with the axis line of each spray pipe as the center.

[0013] The utility model further illustrates, the first drying assembly, second drying assembly, third drying assembly structure same and all include two groups of supporting rods that set up parallel with each other along the length direction of work table, and a plurality of groups of fans are provided between two groups of supporting rods, and the both ends of two groups of supporting rods are fixedly connected with support plate.

[0014] Compared with the prior art, the utility model has achieved the beneficial effects that: the utility model, through setting rotatable rotating table and multiple fixed components on the rotating table, multiple steel pipes are rotatably fixed and transmitted.

[0015] The input assembly, the first paint spraying assembly, the second paint spraying assembly, the third paint spraying assembly, the first drying assembly, the second drying assembly, the third drying assembly and the output assembly are arranged to realize the effects of simultaneously spraying, drying and conveying multiple groups of steel pipes. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present application, and constitute a part of the specification, and are used to explain the present application together with the embodiments of the present application, and do not constitute a limitation on the present application. In the drawings:

[0017] Figure 1 is a schematic view of the overall structure of the present application;

[0018] Figure 2 is a schematic view of the workbench and base structure of the present application;

[0019] Figure 3 is a schematic view of the rotary table and fixing assembly structure of the present application;

[0020] Figure 4 is a schematic view of the rotary drum and column structure of the present application;

[0021] Figure 5 is a schematic view of the front cross-sectional structure of the rotary drum of the present application;

[0022] In the drawings: 1, base; 2, workbench; 3, rotary table; 4, groove one; 5, rotary motor; 6, rotary drum; 7, groove two; 8, connecting hole; 9, gear one; 10, driving motor one; 11, gear two; 12, column; 13, cavity one; 14, fixing area; 15, steel pipe; 16, cylindrical cavity; 17, hemispherical cavity; 18, perforation; 19, top bead; 20, protrusion; 21, limiting groove; 22, hydraulic telescopic cylinder one; 23, pressing plate; 24, input assembly; 25, first paint spraying assembly; 26, second paint spraying assembly; 27, third paint spraying assembly; 28, first drying assembly; 29, second drying assembly; 30, third drying assembly; 31, output assembly; 32, linear motor; 33, connecting plate; 34, clamping assembly; 35, clamping plate; 36, hydraulic telescopic cylinder two; 37, spray pipe; 38, paint spraying head; 39, support rod; 40, fan; 41, support plate. DETAILED DESCRIPTION

[0023] The technical scheme of the present application will be further described in detail below in combination with preferred embodiments and drawings thereof. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0024] Please refer to Figures 1-5 The utility model provides technical scheme: a spraying device for steel pipe production, including base 1 and workstation 2, the upper side of base 1 is provided with rotatable rotary table 3, the upper side of base 1 is provided with recess one 4, the recess one 4 is provided with rotating motor 5 in, and the upper side of base 1 is connected with rotary table 3 through bearing, and the output end of rotating motor 5 is connected at the bottom center of rotary table 3.

[0025] Rotary table 3 is provided with recess two 7, and a plurality of groups of rotatable fixed assemblies are movably arranged on rotary table 3, and the plurality of groups of fixed assemblies are evenly distributed with the recess two 7 as the center circle, and the fixed assembly includes rotating drum 6, a plurality of groups of connecting holes 8 are arranged on the inner wall of recess two 7 corresponding to rotating drum 6, rotating drum 6 penetrates connecting hole 8 along the axial direction and is rotatably connected with connecting hole 8, specifically, rotating drum 6 is rotatably connected with connecting hole 8 through bearing.

[0026] The outer circumferential surface of rotating drum 6 on one side in recess two 7 is provided with gear one 9, recess two 7 is provided with drive motor one 10 corresponding to rotating drum 6, the output end of drive motor one 10 is fixedly connected with gear two 11, and gear one 9 is meshed with gear two 11.

[0027] Rotating drum 6 is wrapped with column body 12, and the column body 12 is movably connected with rotating drum 6, and the cavity one 13 is formed in rotating drum 6, and the both ends of the cavity one 13 along the axial direction of the rotating shaft are provided with openings, the outer wall of column body 12 is attached to the inner wall of cavity one 13, and column body 12 slides in cavity one 13 along the axial direction of rotating drum 6.

[0028] The fixed area 14 is formed in rotating drum 6 away from one side of recess two 7, the part of rotating drum 6 in fixed area 14 is sleeved with steel pipe 15, the circumferential inner wall of cavity one 13 in fixed area 14 is provided with a plurality of groups of cylindrical cavities 16, one side of cylindrical cavity 16 away from the axis of rotating drum 6 is a hemispherical cavity 17, the radius of hemispherical cavity 17 is R1; one side of the hemispherical cavity 17 of cylindrical cavity 16 away from the axis of rotating drum 6 penetrates rotating drum 6 to form a group of perforations 18 with a radius R2, and the radius R2 of perforation 18 is less than the radius R1 of hemispherical cavity 17.

[0029] Each group of cylindrical cavities 16 is provided with a top bead 19, the outer wall of top bead 19 is directly contacted with the inner wall of cylindrical cavity 16, the hemispherical cavity 17 of cylindrical cavity 16 wraps top bead 19, when the hemispherical cavity 17 of column wraps top bead 19, part of the spherical surface of top bead 19 passes through perforation 18 to form convex 20 on the outer wall of rotating drum 6.

[0030] The wall thickness of rotating drum 6 is less than the diameter of top bead 19, and the outer wall of column body 12 is provided with a limiting groove 21 corresponding to the position of cylindrical cavity 16, and the limiting groove 21 is a water drop-shaped groove which is gradually deepened from narrow to wide along the axial direction of rotating drum 6 from the side close to recess two 7 to the other end.

[0031] The hydraulic telescopic cylinder one 22 is provided with an output end rotatably connected with the column 12. In the initial state, the output end of the hydraulic telescopic cylinder one 22 is in the retracted state. At this time, the top bead 19 is in direct contact with the groove wall of the one end of the limiting groove 21 away from the recess two 7, and the top bead 19 is movable in the cylindrical cavity 16, so that the top bead 19 is not completely attached to the hemispherical cavity 17 of the cylindrical cavity 16.

[0032] When the hydraulic telescopic cylinder one 22 is extended, the output end of the hydraulic telescopic cylinder one 22 pushes the column 12 away from the recess two 7, and the limiting groove 21 moves away from the recess two 7 along with the column 12. Under the restriction of the limiting groove 21 and the cylindrical cavity 16, the top bead 19 moves to the side of the perforation 18. When the hydraulic telescopic cylinder one 22 is completely extended, the top bead 19 is in direct contact with the groove wall of the one end of the limiting groove 21 close to the recess two 7. Since the groove depth of the one end of the limiting groove 21 close to the recess two 7 is shallower than that of the one end of the limiting groove 21 away from the recess two 7, the top bead 19 is pressed in the hemispherical cavity 17 of the cylindrical body by the limiting groove 21, so that the top bead 19 is completely attached to the hemispherical cavity 17 of the cylindrical cavity 16. Thus, part of the spherical surface of the top bead 19 passes through the perforation 18 to form a protrusion 20 on the surface of the rotating drum 6.

[0033] Therefore, when the hydraulic telescopic cylinder one 22 is in the retracted state, the steel pipe 15 is sleeved on the outer wall of the rotating drum 6 located in the fixed area 14. Then the output end of the hydraulic telescopic cylinder one 22 is controlled to be extended. Under the movement of the column 12, the top bead 19 is pressed in the hemispherical cavity 17 of the cylindrical body by the limiting groove 21, and is completely attached to the hemispherical cavity 17 of the cylindrical cavity 16. Thus, part of the spherical surface of the top bead 19 passes through the perforation 18 to form a protrusion 20 on the surface of the rotating drum 6. The protrusion 20 plays a role of pressing and supporting the inner wall of the steel pipe 15, thereby preventing the steel pipe 15 from rotating on the rotating drum 6.

[0034] The rotating drum 6 is sleeved with a pressing plate 23. The pressing plate 23 is located on the side of the fixed area 14 close to the recess two 7. When the steel pipe 15 is sleeved on the rotating drum 6, the pressing plate 23 plays a role of limiting and positioning the steel pipe 15.

[0035] The eight workbenches 2 are uniformly distributed in a circle with the axis of the rotating table 3 as the center. The input assembly 24, the first paint spraying assembly 25, the second paint spraying assembly 26, the third paint spraying assembly 27, the first drying assembly 28, the second drying assembly 29, the third drying assembly 30 and the output assembly 31 are sequentially arranged in the clockwise direction on the eight workbenches 2 with the axis of the rotating table 3 as the center.

[0036] The input assembly 24 and the output assembly 31 are the same in structure and each include a linear motor 32 arranged along the length direction of the workbench 2. The output end of the linear motor 32 is connected with a connecting plate 33. The connecting plate 33 is provided with a clamping assembly 34 at both ends along the width direction of the workbench 2.

[0037] The clamping assembly 34 comprises vertically symmetrical clamping plates 35, and two groups of clamping plates 35 are connected with hydraulic telescopic cylinders 36 away from one side of the symmetry center line, and the hydraulic telescopic cylinders 36 are fixedly connected to the connecting plate 33.

[0038] The existing clamping and moving device is used to clamp and place the steel pipe 15 between the two groups of clamping plates 35 of the input assembly 24, the hydraulic telescopic cylinders 36 are controlled to extend, the two groups of clamping plates 35 clamp and position the steel pipe 15, then the linear motor 32 is controlled to drive the connecting plate 33 to move to one side of the turntable 3, so that the steel pipe 15 is sleeved on the corresponding rotating drum 6.

[0039] The first paint spraying assembly 25, the second paint spraying assembly 26 and the third paint spraying assembly 27 are the same in structure, and each comprises three groups of spray pipes 37 arranged in parallel along the length direction of the workbench 2, the input ends of the three groups of spray pipes 37 are connected to a pump body and a paint tank through a hose, and a control valve is arranged on the hose.

[0040] A plurality of groups of paint spraying heads 38 are arranged on the three groups of spray pipes 37, and the plurality of groups of paint spraying heads 38 are linearly and uniformly arranged along the axial direction of the spray pipe 37; wherein the paint spraying heads 38 on the middle group of spray pipes 37 are vertically arranged, and the paint spraying heads 38 on the other two groups of spray pipes 37 are arranged obliquely to one side close to the middle group of spray pipes 37 with the axial center line of the respective spray pipe 37 as the center, and specifically, the oblique angle is 15°.

[0041] The first drying assembly 28, the second drying assembly 29 and the third drying assembly 30 are the same in structure, and each comprises two groups of supporting rods 39 arranged in parallel along the length direction of the workbench 2, a plurality of groups of fans 40 are arranged between the two groups of supporting rods 39, the plurality of groups of fans 40 are linearly and uniformly arranged along the length direction of the supporting rod 39, and supporting plates 41 are fixedly connected to the two ends of the two groups of supporting rods 39 and are fixedly connected to the workbench 2.

[0042] In this embodiment, the existing clamping and moving device is used to clamp and place the steel pipe 15 between the two groups of clamping plates 35 of the input assembly 24, the hydraulic telescopic cylinders 36 are controlled to extend, the two groups of clamping plates 35 clamp and position the steel pipe 15, then the linear motor 32 is controlled to drive the connecting plate 33 to move to one side of the turntable 3, so that the steel pipe 15 is sleeved on the corresponding rotating drum 6, and one end of the steel pipe 15 abuts against one side of the pressing plate 23.

[0043] Subsequently, the output end of the hydraulic telescopic cylinder 22 corresponding to the rotating drum 6 is controlled to extend out, and the top bead 19 is pressed by the limiting groove 21 in the hemispherical cavity 17 of the cylindrical body under the movement of the cylindrical body 12, and is completely attached to the hemispherical cavity 17 of the cylindrical cavity 16, so that part of the spherical surface of the top bead 19 forms a protrusion 20 on the surface of the rotating drum 6 through the perforation 18, and the protrusion 20 formed plays a role of pressing and supporting the inner wall of the steel pipe 15, thereby preventing the steel pipe 15 from rotating on the upper rotating drum 6.

[0044] Then the hydraulic telescopic cylinder 36 is controlled to retract, canceling the clamping of the steel pipe 15, and at the same time the output end of the linear motor 32 is controlled to drive the connecting plate 33 to reset.

[0045] The rotating motor 5 is controlled to rotate the rotating table 3 by 45°, so that a group of rotating drums 6 sleeved with the steel pipe 15 is rotated from the input assembly 24 to above the first paint spraying assembly 25, and the first paint spraying assembly 25 is controlled to spray paint on the steel pipe 15, and the range of paint sprayed on the steel pipe 15 is greater than 1 / 3 of the circumferential surface of the steel pipe 15.

[0046] Every time the rotating motor 5 controls the rotating table 3 to rotate by 45°, a group of rotating drums 6 not sleeved with the steel pipe 15 will be rotated to above the input assembly 24 under the driving of the rotating table 3, and the steel pipe 15 is sleeved on the rotating drum 6 through the input assembly 24.

[0047] When the first group of steel pipes 15 completes the paint spraying on the first paint spraying assembly 25, the rotating motor 5 is started again to control the rotating table 3 to rotate by 45°, so that the first group of steel pipes 15 is rotated to above the second paint spraying assembly 26 under the driving of the rotating table 3, and in the process of rotating from the first paint spraying assembly 25 to the second paint spraying assembly 26, the corresponding driving motor drives the rotating drum 6 to rotate, so that when the rotating drum 6 reaches above the second paint spraying assembly 26, it is just rotated by 120° around its own axis, thereby making the steel pipe 15 rotate by 120° following the rotating drum 6, and the second paint spraying assembly 26 is started to spray paint on the steel pipe 15, and the range of paint sprayed on the steel pipe 15 is greater than 1 / 3 of the circumferential surface of the steel pipe 15.

[0048] When the first group of steel pipes 15 completes the paint spraying on the second paint spraying assembly 26, the rotating motor 5 is started again to control the rotating table 3 to rotate by 45°, so that the first group of steel pipes 15 is rotated to above the third paint spraying assembly 27 under the driving of the rotating table 3, and in the process of rotating from the second paint spraying assembly 26 to the third paint spraying assembly 27, the corresponding driving motor drives the rotating drum 6 to rotate, so that when the rotating drum 6 reaches above the third paint spraying assembly 27, it is just rotated by 120° around its own axis, thereby making the steel pipe 15 rotate by 120° following the rotating drum 6, and the third paint spraying assembly 27 is started to spray paint on the steel pipe 15, and the range of paint sprayed on the steel pipe 15 is greater than 1 / 3 of the circumferential surface of the steel pipe 15, so that after three times of paint spraying, the outer surface of the first group of steel pipes 15 is completely coated with paint.

[0049] When the first group of steel pipes 15 finishes painting on the third painting assembly 27, the rotary motor 5 is started again to control the rotation of the turntable 3 by 45°, so that the first group of steel pipes 15 is rotated to above the first drying assembly 28 under the driving of the turntable 3, and the corresponding driving motor is controlled to rotate the drum 6 in the process of rotating from the first drying assembly 28 to the second drying assembly 29, so that the drum 6 rotates by 120° with its own axis as the center when it reaches above the second drying assembly 29, so that the steel pipe 15 rotates by 120° following the drum 6, and the fan 40 of the second drying assembly 29 is started to dry the first group of steel pipes 15 by wind power.

[0050] When the second group of steel pipes 15 finishes painting on the third painting assembly 27, the rotary motor 5 is started again to control the rotation of the turntable 3 by 45°, so that the first group of steel pipes 15 is rotated to above the second drying assembly 29 under the driving of the turntable 3, and the corresponding driving motor is controlled to rotate the drum 6 in the process of rotating from the first drying assembly 28 to the second drying assembly 29, so that the drum 6 rotates by 120° with its own axis as the center when it reaches above the second drying assembly 29, so that the steel pipe 15 rotates by 120° following the drum 6, and the fan 40 of the second drying assembly 29 is started to dry the first group of steel pipes 15 by wind power.

[0051] When the third group of steel pipes 15 finishes painting on the third painting assembly 27, the rotary motor 5 is started again to control the rotation of the turntable 3 by 45°, so that the first group of steel pipes 15 is rotated to above the third drying assembly 30 under the driving of the turntable 3, and the corresponding driving motor is controlled to rotate the drum 6 in the process of rotating from the second drying assembly 29 to the third drying assembly 30, so that the drum 6 rotates by 120° with its own axis as the center when it reaches above the third drying assembly 30, so that the steel pipe 15 rotates by 120° following the drum 6, and the fan 40 of the third drying assembly 30 is started to dry the first group of steel pipes 15 by wind power.

[0052] When the fourth group of steel pipes 15 finishes painting on the third painting assembly 27, the rotary motor 5 is started again to control the rotation of the turntable 3 by 45°, so that the first group of steel pipes 15 is rotated to above the output assembly 31 under the driving of the turntable 3, and then the output end of the linear motor 32 on the output assembly 31 is controlled to move to the side of the turntable 3, and the clamping assembly 34 on the output assembly 31 is controlled to clamp the dried steel pipe 15, and the output end of the corresponding hydraulic telescopic cylinder 22 is controlled to retract, and after the column 12 moves to the side close to the turntable 3, the top bead 19 moves to the cylindrical cavity 16 under the pressing of the inner wall of the steel pipe 15, and does not completely fit with the hemispherical cavity 17 of the cylindrical cavity 16, so that the top bead 19 cannot pass through the perforation 18 to form a protrusion 20 on the surface of the drum 6, so as to facilitate the clamping assembly 34 on the output assembly 31 to clamp the steel pipe 15, and then move the steel pipe 15 out of the drum 6 under the driving of the output end of the linear motor 32.

[0053] When the output end of the linear motor 32 on the output assembly 31 drives the clamping assembly 34 clamping the steel pipe 15 to move to the side away from the rotary table 3, the hydraulic telescopic cylinder two 36 on the output assembly 31 is controlled to retract, so that the clamping assembly 34 cancels the clamping of the steel pipe 15, and the existing clamping and moving device is used to clamp the steel pipe 15 from the output assembly 31.

[0054] Subsequently, when the rotary motor 5 controls the rotary table 3 to rotate by 45°, the second group of dried steel pipes 15 is moved above the output assembly 31, a new group of dried steel pipes 15 is clamped and moved out of the rotary drum 6 according to the above steps, and the existing clamping and moving device is used to move the steel pipe 15 out of the output assembly 31.

[0055] In the description of the utility model, it is understood that the terms "upper", "lower", "front", "rear", "left", "right" and the like indicate the orientation or positional relationship shown in the drawings, and are only used for the convenience of describing the utility model, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0056] Finally, it should be pointed out that: the above examples are only used to illustrate the technical solutions of the utility model, and not to limit them. Although the utility model has been described in detail with reference to the foregoing examples, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the utility model embodiments.

Claims

1. A spraying device for steel pipe production, comprising a base (1), characterized in that: The base (1) is provided with a rotatable turntable (3) on its upper side. Multiple sets of rotatable fixed components are movably arranged on the turntable (3). Eight sets of worktables (2) are arranged on the circumference of the base (1). The eight sets of worktables (2) are arranged in a clockwise direction with the turntable (3) as the axis, including an input component (24), a first paint spraying component (25), a second paint spraying component (26), a third paint spraying component (27), a first drying component (28), a second drying component (29), a third drying component (30), and an output component (31).

2. The spraying device for steel pipe production according to claim 1, characterized in that: The fixing assembly includes a rotating cylinder (6), which has a cavity (13) inside. A movable column (12) is enclosed inside the rotating cylinder (6). The column (12) slides in the cavity (13) along the axial direction of the rotating cylinder (6). A fixing area (14) for fixing the sleeved steel pipe (15) is formed on the side of the rotating cylinder (6) away from the groove (7). Several sets of cylindrical cavities (16) are formed on the inner circumference of the cavity (13) in the fixing area (14). The cylindrical cavities (16) are located away from the rotating cylinder (6). One side of the cylinder (6) axis is a hemispherical cavity (17). The hemispherical cavity (17) of the cylindrical cavity (16) away from the axis of the rotating cylinder (6) forms a perforation (18) through the rotating cylinder (6). Each set of cylindrical cavities (16) is provided with a top bead (19). Part of the spherical surface of the top bead (19) passes through the perforation (18) and forms a protrusion (20) on the outer wall of the rotating cylinder (6). The outer wall of the cylinder (12) is provided with a limiting groove (21) corresponding to the position of the cylindrical cavity (16) to limit the movement of the top bead (19).

3. The spraying device for steel pipe production according to claim 2, characterized in that: The radius R2 of the perforation (18) is smaller than the radius R1 of the hemispherical cavity (17), and the wall thickness of the rotating cylinder (6) is smaller than the diameter of the top bead (19).

4. The spraying device for steel pipe production according to claim 1, characterized in that: The input component (24) and the output component (31) have the same structure and both include a linear motor (32) arranged along the length of the worktable (2). The output end of the linear motor (32) is connected to a connecting plate (33). Both ends of the connecting plate (33) along the width of the worktable (2) are provided with clamping components (34).

5. A spraying device for steel pipe production according to claim 4, characterized in that: The clamping assembly (34) includes vertically symmetrically arranged clamping plates (35), and a hydraulic telescopic cylinder (36) is connected to the side of the two sets of clamping plates (35) away from the center line of symmetry.

6. A spraying device for steel pipe production according to claim 1, characterized in that: The first paint spraying assembly (25), the second paint spraying assembly (26), and the third paint spraying assembly (27) have the same structure and all include three sets of spray pipes (37) arranged parallel to each other along the length of the workbench (2). Each of the three sets of spray pipes (37) is equipped with several sets of paint spray heads (38). The input ends of the three sets of spray pipes (37) are connected to the pump body and the paint tank through hoses.

7. A spraying device for steel pipe production according to claim 6, characterized in that: The paint spray head (38) on the middle set of spray pipes (37) is set vertically, while the paint spray head (38) on the other two sets of spray pipes (37) is set inclined towards the side closer to the middle set of spray pipes (37) with the axis of each spray pipe (37) as the center.

8. A spraying device for steel pipe production according to claim 1, characterized in that: The first drying component (28), the second drying component (29), and the third drying component (30) have the same structure, each including two sets of support rods (39) that are parallel to each other along the length of the workbench (2). Several sets of fans (40) are arranged between the two sets of support rods (39), and support plates (41) are fixedly connected to both ends of the two sets of support rods (39).

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