Coating device for inner and outer coatings of plastic-coated composite steel pipe

Abstract

A coating device for inner and outer coatings of a plastic-coated composite steel pipe belongs to the technical field of steel pipe coating and comprises a steel pipe rolling assembly and a height-adjustable coating spraying assembly, the steel pipe rolling assembly comprises a base, and two rolling wheel sets symmetrically arranged about the vertical center of the base are arranged on the base. A steel pipe to be coated with plastic is arranged on the two rolling wheel sets, the rolling wheel sets are driven by a driving assembly to rotate, the paint spraying assembly comprises two spraying parts which are arranged in parallel up and down, and the two spraying parts are fixedly connected to the top and the middle of a height-adjustable connecting rod correspondingly. The bottom of the connecting rod is fixedly connected to a movable bottom plate. The steel pipe coating device is simple in structure, capable of coating the inner surface and the outer surface of a steel pipe respectively, high in automation degree, high in coating efficiency and good in coating quality.

Description

Technical Field

[0001] This utility model belongs to the field of steel pipe coating technology, and relates to the coating work of the inner and outer coatings of large-diameter plastic-coated composite steel pipes, and particularly relates to a coating device for the inner and outer coatings of plastic-coated composite steel pipes. Background Technology

[0002] Plastic-coated composite steel pipes are steel pipes with one or more layers of epoxy resin, polyethylene, or other coatings fused onto the inner and outer surfaces of the steel pipe through processes such as spraying, rolling, dipping, or suction. Epoxy resin-coated steel pipes are suitable for conveying media such as water supply and drainage, seawater, warm water, oil, and gas.

[0003] In existing steel pipe internal and external coating technologies, most methods involve manual pouring of paint onto the pipe surface. This pouring process is prone to uneven distribution. Pouring too much paint can lead to large powder clumps on the pipe surface; these clumps are too large and their internal structure cannot fully cure, affecting both the appearance and quality of the coating. Conversely, insufficient paint results in a thin coating, requiring secondary spraying, which not only affects the steel pipe's corrosion resistance and durability but also increases construction costs.

[0004] Therefore, in order to solve these problems, this utility model proposes an internal and external coating device for plastic-coated composite steel pipes. Summary of the Invention

[0005] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a coating device for the inner and outer coatings of plastic-coated composite steel pipes, so as to solve the technical problems of low automation, low coating efficiency and poor coating quality in the inner and outer coating of plastic-coated composite steel pipes in the prior art.

[0006] To achieve the above and other related objectives, this utility model provides an internal and external coating device for plastic-coated composite steel pipes, including a steel pipe rolling assembly and a height-adjustable paint spraying assembly. The steel pipe rolling assembly includes a base, on which two sets of rolling wheels are symmetrically arranged about the vertical center of the base. The steel pipe to be coated is placed on the two sets of rolling wheels, and the rolling wheels are driven to rotate by a drive assembly. The paint spraying assembly includes two spraying components arranged parallel to each other, and the two spraying components are respectively fixedly connected to the top and middle of a height-adjustable connecting rod. The bottom of the connecting rod is fixedly connected to a movable base plate.

[0007] In any of the above embodiments, it is preferred that the top of the base is concave to form a "U" shape and the two ends of the base are open, and the rolling wheel assembly is disposed in the groove of the base.

[0008] In any of the above embodiments, it is preferred that each set of rollers includes two rollers, each roller has a steel pipe anti-detachment baffle on its outer side, and the distance between the other side of each roller and the end of the steel pipe to be coated is no more than 100mm.

[0009] In any of the above embodiments, it is preferred that a rotating spindle is fixedly connected to the middle of the outer side of each of the rolling wheels, and the drive assembly includes two motors, each of which is connected to the rotating spindle via a power drive line.

[0010] Preferably, in any of the above embodiments, the spraying component is hollow inside, the width of the spraying component decreases from top to bottom, and a plurality of spraying nozzles are evenly provided at the bottom of the spraying component along its length.

[0011] Preferably, in any of the above embodiments, the spraying component is provided with a spraying valve at the bottom for controlling the opening and closing of the spray nozzle.

[0012] Preferably, in any of the above embodiments, the base plate is provided with a control panel electrically connected to the spray valve.

[0013] Preferably, in any of the above solutions, the connecting rod is a telescopic rod.

[0014] In any of the above embodiments, it is preferred that the base plate is connected to the side wall of the base via a telescopic track.

[0015] As described above, the internal and external coating device for plastic-coated composite steel pipes of this utility model has the following beneficial effects:

[0016] 1. In this utility model, the uniformity and consistency of paint spraying can be controlled by the spray valve, ensuring that the thickness of the plastic coating layer is consistent on all parts of the steel pipe surface, which can reduce paint waste caused by secondary spraying.

[0017] 2. In this utility model, the rolling wheel can drive the steel pipe to rotate together, which greatly enhances the uniformity of the coating during spraying and ensures the quality of the plastic coating layer.

[0018] 3. In this utility model, the height-adjustable connecting rod can adjust different spraying heights, adapt to steel pipes of different diameters for plastic coating, and save on the repetitive configuration of equipment.

[0019] 4. In this utility model, the inner and outer plastic coating of the steel pipe can be carried out in batches. The plastic coating materials adapted to different temperatures can be used to coat the steel pipe, ensuring one-time plastic coating and avoiding the disadvantages of secondary heating process causing certain internal structural damage to the existing coating and secondary repeated heating increasing production costs. Attached Figure Description

[0020] Figure 1 The diagram shown is a structural schematic of this utility model.

[0021] Figure 2 This is a front view of the present invention.

[0022] Figure 3 The image shown is a side view of this utility model.

[0023] Figure 4 The image shown is a cross-sectional view of the spray nozzle.

[0024] Component designation explanation

[0025] 1-Rolling wheel; 2-Electric drive line; 3-Motor; 4-Steel pipe anti-detachment baffle; 5-Steel pipe to be coated with plastic; 6-Connecting rod; 7-Spraying component; 8-Control panel; 9-Telescopic track; 10-Spraying valve; 11-Base; 12-Rotating spindle; 13-Base plate. Detailed Implementation

[0026] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0027] Please see Figures 1 to 4 It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this invention, should still fall within the scope of the disclosed technical content. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0028] Please see Figure 1-4 This utility model provides an internal and external coating device for plastic-coated composite steel pipes, including a steel pipe rolling assembly and a height-adjustable paint spraying assembly. The steel pipe rolling assembly includes a base 11, on which two sets of rolling wheels are symmetrically arranged about the vertical center of the base 11. The steel pipe 5 to be coated is placed on the two sets of rolling wheels. The rolling wheels are driven to rotate by a drive assembly. The paint spraying assembly includes two spraying elements 7 arranged parallel to each other. The two spraying elements 7 are respectively fixedly connected to the top and middle of the height-adjustable connecting rod 6. The bottom of the connecting rod 6 is fixedly connected to a movable base plate 13.

[0029] In this embodiment, the paint spraying assembly is first removed, and then the heated plastic-coated steel pipe 5 is hoisted onto the roller assembly. The roller assembly is driven to rotate by the drive assembly, and the rotation of the roller assembly causes the plastic-coated steel pipe 5 to rotate. The paint is evenly spread into the spraying component 7. The height of the connecting rod 6 is adjusted so that the two spraying components 7 are respectively located at the top of the plastic-coated steel pipe 5 and at the center of the inside of the plastic-coated steel pipe 5. Then, the base plate 13 is moved to push the lower spraying component 7 into the plastic-coated steel pipe 5, and the upper spraying component 7 is located directly above the plastic-coated steel pipe 5. Then, the spraying components 7 are opened to spray the inner and outer surfaces of the plastic-coated steel pipe 5. During the coating process, the roller assembly drives the steel pipe 5 to be coated to rotate. The coating material rotates on the surface of the steel pipe 5. The temperature of the steel pipe 5 itself dissolves the particulate coating material sprayed from the coating spray tank into a fluid coating material. After the temperature gradually cools down, the coating material forms a smooth, uniform and suitable coating layer on the surface of the steel pipe, thus completing the coating work on the inner and outer surfaces of the steel pipe.

[0030] As a further description of the above embodiment, the top of the base 11 is recessed downward to form a "U" shape and the two ends of the base 11 are open, and the rolling wheel group is disposed in the groove of the base 11.

[0031] In this embodiment, the base 11 is set in a "U" shape, and the rolling wheel set is set in the groove so that the waste material in the paint spraying process can enter the groove of the base 11 for recycling, reducing the difficulty of waste collection and treatment, and preventing waste from polluting the environment and ensuring the cleanliness of the working environment.

[0032] As a further description of the above embodiments, each set of rollers includes two rollers 1, and each roller 1 is provided with a steel pipe anti-detachment baffle 4 on its outer side. The distance between the other side of each roller 1 and the port of the steel pipe 5 to be coated is no more than 100mm.

[0033] In this embodiment, to facilitate the subsequent welding and installation of the steel pipe, the outer surface within 100mm of the steel pipe end is generally not coated. Therefore, placing the roller 1 within 100mm of the steel pipe end will not affect the outer coating of the steel pipe, thus ensuring the coating quality of the steel pipe.

[0034] In this embodiment, the steel pipe anti-detachment baffle 4 can prevent the steel pipe 5 to be coated from falling off during rotation, thereby ensuring the normal operation of the coating device.

[0035] As a further description of the above embodiment, a rotating spindle 12 is fixedly connected to the middle of the outer side of each of the rolling wheels 1, and the drive assembly includes two motors 3, each of the motors 3 being connected to the rotating spindle 12 via a power drive line 2.

[0036] In this embodiment, the motor 3 drives the rotating spindle 12 to rotate via the power drive line 2. The rotation of the rotating spindle 12 drives the rolling wheel 1 to rotate, thereby driving the steel pipe 5 to be coated to rotate, ensuring the uniformity of the coating on the inner and outer surfaces of the steel pipe 5, thus ensuring the coating quality.

[0037] In this embodiment, a bearing (not shown in the figure) is fitted around the rotating spindle 12, and the bearing is connected to the base 11 through a bearing seat (not shown in the figure). The bearing seat and the base 11 are detachably connected, allowing the distance between the bearing seats in the same group to be adjusted according to the diameter of different steel pipes, thereby adjusting the distance between the rotating spindles 12 in the same group, and further adjusting the distance between the rolling wheels 1 in the same group, so that the rolling wheels 1 can contact steel pipes of different diameters to meet different usage requirements.

[0038] As a further description of the above embodiment, the spraying component 7 is hollow inside, the width of the spraying component 7 decreases from top to bottom, and a plurality of spraying nozzles are evenly provided at the bottom of the spraying component 7 along its length direction.

[0039] In this embodiment, the spray nozzle 7 is hollow inside to facilitate the storage of paint. The width of the spray nozzle 7 decreases from top to bottom to prevent paint from flowing out easily and being wasted.

[0040] In this embodiment, the uniform arrangement of the spray nozzles along the length of the spraying component 7 can ensure the uniformity of the coating sprayed on the plastic steel pipe 5 to be coated, thereby ensuring the coating quality.

[0041] As a further description of the above embodiment, the bottom of the spraying component 7 is provided with a spray valve 10 for controlling the opening and closing of the spray nozzle. The base plate 13 is provided with a control panel 8 electrically connected to the spray valve 10.

[0042] In this embodiment, the control panel 8 is used to control the opening and closing of the spray valve 10, which can provide different opening widths according to different paint particle sizes, thereby achieving different paint spraying speeds and allowing the paint to be sprayed evenly on the surface of the steel pipe.

[0043] As a further description of the above embodiment, the connecting rod 6 is a telescopic rod.

[0044] In this embodiment, the connecting rod 6 can be an electric telescopic rod, a pneumatic telescopic rod, or the like to adjust the height of the spraying component 7.

[0045] As a further description of the above embodiment, the base plate 13 is connected to the side wall of the base 11 via a telescopic track 9.

[0046] In this embodiment, the base plate 13 is connected to the base 11 via the telescopic rail 9, which facilitates the movement of the rail, allowing the spraying component 7 to extend into or move out of the steel pipe 5 to be coated, thus facilitating the installation and removal of the steel pipe 5.

[0047] In this embodiment, the telescopic track 9 is existing technology, and those skilled in the art can know it from existing technology. Therefore, in this embodiment, its specific structure and the connection method between it and the base plate 13 will not be further described.

[0048] In summary, this utility model has a simple structure, can coat the inner and outer surfaces of steel pipes separately, has a high degree of automation, high coating efficiency, and good coating quality. Therefore, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0049] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A coating device for internal and external coating of plastic-coated composite steel pipes, characterized in that: The system includes a steel pipe rolling assembly and a height-adjustable paint spraying assembly. The steel pipe rolling assembly includes a base (11). The base (11) is provided with two sets of rolling wheels that are symmetrically arranged about the vertical center of the base (11). The steel pipe (5) to be coated is arranged on the two sets of rolling wheels. The rolling wheels are driven to rotate by a drive assembly. The paint spraying assembly includes two spraying parts (7) arranged parallel to each other. The two spraying parts (7) are respectively fixedly connected to the top and middle of the height-adjustable connecting rod (6). The bottom of the connecting rod (6) is fixedly connected to a movable base plate (13).

2. The coating device for internal and external coating of plastic-coated composite steel pipe according to claim 1, characterized in that: The top of the base (11) is recessed downward to form a "U" shape and the two ends of the base (11) are open. The rolling wheel set is set in the groove of the base (11).

3. The coating device for internal and external coating of plastic-coated composite steel pipe according to claim 1, characterized in that: Each set of rollers includes two rollers (1), and each roller (1) is provided with a steel pipe anti-detachment baffle (4) on its outer side. The distance between the other side of each roller (1) and the port of the steel pipe (5) to be coated is no more than 100mm.

4. The coating device for internal and external coating of plastic-coated composite steel pipe according to claim 3, characterized in that: Each of the rolling wheels (1) has a rotating spindle (12) fixedly connected to its outer center. The drive assembly includes two motors (3), each of which is connected to the rotating spindle (12) via a power drive line (2).

5. The coating device for internal and external coating of plastic-coated composite steel pipe according to claim 1, characterized in that: The spraying component (7) is hollow inside, and the width of the spraying component (7) decreases from top to bottom. Several spraying nozzles are evenly opened at the bottom of the spraying component (7) along its length.

6. The coating device for internal and external coating of plastic-coated composite steel pipe according to claim 5, characterized in that: The bottom of the spraying component (7) is provided with a spraying valve (10) for controlling the opening and closing of the spraying nozzle.

7. The coating device for internal and external coating of plastic-coated composite steel pipe according to claim 6, characterized in that: The base plate (13) is provided with a control panel (8) that is electrically connected to the spray valve (10).

8. The coating device for internal and external coating of plastic-coated composite steel pipe according to claim 1, characterized in that: The connecting rod (6) is a telescopic rod.

9. The coating device for internal and external coating of plastic-coated composite steel pipe according to claim 1, characterized in that: The base plate (13) is connected to the side wall of the base (11) via a telescopic track (9).

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