Coating device for inner wall of pipeline and plasma coating system

Abstract

The utility model relates to a coating device for the inner wall of a pipeline and a plasma coating system, the coating device comprises a device body, and the device body comprises a limiter, a connecting sleeve and an elastic piece; the elastic piece has elastic force enabling the limiting stopper and the connecting sleeve to be close to each other. The moving assembly comprises a first connecting rod, a second connecting rod and a moving part; one end of the first connecting rod is hinged with the limiter, and the other end is connected with the moving part; one end of the second connecting rod is hinged to the connecting sleeve, and the other end is hinged to the first connecting rod; the moving part abuts against the inner wall of the pipeline and is used for driving the device body to move. The at least two moving assemblies are arranged around the axis of the device body, so that the moving parts abut against the inner wall of the pipeline, and the axis of the device body is coaxial with the pipeline. And the spray head is mounted on the limiter and is coaxially arranged with the device body. The device can realize inner wall coating of a long pipeline, ensures the uniformity of long-distance coating, and is suitable for inner wall coating of pipelines with different diameters.

Description

Technical Field

[0001] This application relates to the field of pipeline coating technology, and in particular to a coating apparatus for the inner wall of a pipeline and a plasma coating system. Background Technology

[0002] Pipelines are a crucial component of transportation systems, widely used in petrochemical industries, marine engineering, urban water supply systems, and wastewater treatment systems. During long-term use, the transported media inevitably cause wear and corrosion to the inner walls of pipelines. Therefore, current technologies typically employ coating methods to improve wear and corrosion resistance. However, existing technologies mainly focus on coating the inner walls of short pipelines, and several technical challenges remain for coating long pipelines.

[0003] For example, utility model CN ​​219647897 U discloses an anti-corrosion spraying device for the inside of metal pipes. This device uses a cylinder to push the pipe and the spraying device to move relative to each other, thereby coating different locations on the inner wall of the pipe. However, the coating length is limited by the cylinder stroke, making it unsuitable for long-distance coating within long pipes. Furthermore, in coating long pipes, due to the long distance the spraying device moves relative to the pipe, the spraying device is prone to radial displacement due to its own weight or other factors, resulting in uneven coating.

[0004] In summary, existing technologies suffer from limitations in the spraying length of large pipelines and the difficulty in maintaining uniformity during long-distance spraying. Utility Model Content

[0005] Therefore, it is necessary to provide a coating device and a plasma coating system for the inner wall of pipes. The specific technical solution is as follows.

[0006] A coating apparatus for the inner wall of a pipe, comprising:

[0007] The device body includes a limiter, a connecting sleeve, and an elastic element; one end of the elastic element is connected to the limiter, and the other end is connected to the connecting sleeve, and the elastic element has an elastic force that brings the limiter and the connecting sleeve closer to each other; the limiter and the connecting sleeve are arranged coaxially.

[0008] The movable assembly includes a first connecting rod, a second connecting rod, and a movable component; one end of the first connecting rod is hinged to a limiter, and the other end is connected to the movable component; one end of the second connecting rod is hinged to a connecting sleeve, and the other end is hinged to the first connecting rod; the movable component abuts against the inner wall of the pipe and is used to drive the device body to move; at least two sets of movable assemblies are arranged around the axis of the device body, such that the movable component abuts against the inner wall of the pipe, and the axis of the device body is coaxial with the pipe.

[0009] The nozzle, mounted on the limiter and coaxially arranged with the device body, is used to coat the inner wall of the pipe.

[0010] Furthermore, the first link of each group of moving components has the same size, and the second link of each group of moving components also has the same size, so that the distance between the moving part of each group of moving components and the axis of the device body is equal.

[0011] Furthermore, the moving component is a tracked wheel.

[0012] Furthermore, it also includes a power source, which is connected to the tracked wheels via wires.

[0013] Furthermore, it includes three sets of moving components, which are evenly arranged around the axis of the device body.

[0014] A plasma coating system for the inner wall of a pipe, comprising:

[0015] A coating apparatus; the nozzle includes an anode plate, and the surface of the anode plate is provided with air holes;

[0016] Sealing elements are installed at both ends of the pipe to create a sealed space inside the pipe;

[0017] A gas supply system includes a reaction gas supply component and a gas guiding component; the reaction gas supply component is connected to a sealed space and is used to inject reaction gas into the sealed space; the gas guiding component is connected to a nozzle and communicates with the vent holes on the surface of the anode plate, and is used to spray gas flow into the inner wall of the pipe.

[0018] Furthermore, it also includes a vacuum assembly, which includes a vacuum generating unit and a vacuum measuring device. The vacuum generating unit is connected to the sealed space and is used to evacuate the sealed space; the vacuum measuring device is used to measure the vacuum status of the sealed space.

[0019] Furthermore, the nozzle also includes a motor, which is mounted on a limiter; the anode plate is connected to the motor shaft via a connector.

[0020] Furthermore, the number of anode plates is three, and the three anode plates are arranged around the axis of the rotating shaft, which is coaxial with the device body.

[0021] Furthermore, the sealing element is a magnetohydrodynamic sealing flange.

[0022] Beneficial Effects: The coating device and plasma coating system for the inner wall of pipes provided by this utility model can move the device body by moving the moving parts, enabling the coating device to move a long distance inside the pipe and achieve coating of the inner wall of long pipes. During the movement of the coating device, the distance between each moving part and the device body is determined by the distance between the limiter and the connecting sleeve. Therefore, the relative position of each moving part and the device body always changes synchronously, ensuring that the device body will not be radially offset from the pipe during long-distance movement, thus ensuring the uniformity of long-distance coating. By stretching the elastic element, the distance between the limiter and the connecting sleeve can be changed, thereby changing the distance between the moving parts and the axis of the device body, making the coating device applicable to coating long pipes with different inner diameters. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the coating device.

[0025] Figure 2 This is a rear view of the coating apparatus;

[0026] Figure 3 This is a schematic diagram of the overall plasma coating system;

[0027] Figure 4 This is a front view of the nozzle.

[0028] Explanation of reference numerals in the attached drawings: 100, pipe; 200, vacuum assembly; 300, gas supply system; 400, coating device; 500, power supply;

[0029] 101. Seals; 102. Support frame;

[0030] 201. Vacuum generating unit; 202. Vacuum measuring device;

[0031] 301. Reaction gas supply assembly; 302. Gas pipe; 303. Gas supply guide assembly;

[0032] 401. Elastic component; 402. Connecting sleeve; 403. Moving component; 404. First rod; 405. Second connecting rod; 406. Limiter; 410. Nozzle; 411. Motor; 412. Anode plate; 413. Air hole. Detailed Implementation

[0033] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0034] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0036] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0037] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0038] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0039] Example 1

[0040] Reference Figure 1 As shown, this embodiment provides a coating device 400 for the inner wall of a pipe, including a device, a moving assembly, and a nozzle 410. The device body includes a limiter 406, a connecting sleeve 402, and an elastic element 401. The limiter 406 and the connecting sleeve 402 are arranged coaxially. One end of the elastic element 401 is connected to the limiter 406, and the other end is connected to the connecting sleeve 402. The elastic element 401 has an elastic force that brings the limiters 406 closer together; that is, when the coating device 400 is in the working state, the elastic element 401 is always in a stretched state. In this embodiment, the elastic element 401 can be a spring or other elastic component.

[0041] The movable assembly includes a first connecting rod 404, a second connecting rod 405, and a movable member 403. One end of the first connecting rod 404 is hinged to the limiter 406, and the other end is hinged to the movable member 403. One end of the second connecting rod 405 is hinged to the connecting sleeve 402, and the other end is hinged to the first connecting rod. Thus, the first connecting rod 404, the second connecting rod 405, and the elastic member 401 form a triangle. When the length of the elastic member 401 extends or retracts, the angle between the first connecting rod 404 and the elastic member 401 changes accordingly, thereby altering the distance between the movable member 403 at the end of the first connecting rod 404 and the axis of the device body. Specifically, corresponding hinges can be provided on the limiter 406, the connecting sleeve, and the connecting rods to achieve the hinge connection.

[0042] When the coating device 400 is placed inside the inner wall of the pipe 100, the elastic element 401 is always in a stretched state, meaning that the elastic element 401 has the elastic potential energy to drive the limiter 406 and the connecting sleeve 402 to move closer together. When the limiter 406 and the connecting sleeve 402 move closer together, they drive the moving element 403 to move away from the axis of the device body. Therefore, when the coating device 400 is placed inside the inner wall of the pipe 100, the elastic element 401 drives the moving element 403 to move away from the axis of the device body, thereby causing the moving element 403 to abut against the inner wall of the pipe 100, maintaining the stability of the coating device 400. The moving element 403 abuts against the inner wall of the pipe 100, and by moving the device body through the moving element 403, the coating device 400 moves. The nozzle 410 is mounted on the limiter 406 and arranged coaxially with the device body. By moving the device body, the nozzle 410 moves, thereby achieving long-distance movement and coating within the long pipe 100.

[0043] In this embodiment, three sets of moving components are provided, arranged around the axis of the device body to maintain stable support for the device body. In other embodiments, two, four, or more sets of moving components may be provided.

[0044] This embodiment provides a coating device 400 for the inner wall of a pipe. The device body is moved by a moving component 403, enabling the coating device 400 to move a long distance within the pipe 100, thus achieving coating of the inner wall of the long pipe 100. During the movement of the coating device 400, the distance between each moving component 403 and the device body is determined by the distance between the limiter 406 and the connecting sleeve 402. Therefore, the relative positions of each moving component 403 and the device body always change synchronously, ensuring that the device body will not radially deviate from the pipe 100 during long-distance movement, thus ensuring the uniformity of long-distance coating. By stretching the elastic component 401, the distance between the limiter 406 and the connecting sleeve 402 can be changed, thereby changing the distance between the moving component 403 and the axis of the device body, making the coating device 400 suitable for coating long pipes 100 with different inner diameters.

[0045] Specifically, in this embodiment, the first connecting rod 404 of each group of moving components has the same size, and the second connecting rod 405 of each group of moving components also has the same size, so that the distance between the moving part 403 of each group of moving components and the device body is equal, thereby ensuring that the axis of the device body is coaxially arranged with the axis of the inner wall of the pipe 100, and ensuring uniform coating on the inner wall of the pipe 100.

[0046] Specifically, the moving component 403 is a tracked wheel, which has a built-in drive structure to move, thereby moving the coating device 400. The tracked wheel has a large contact surface with the inner wall of the pipe 100, which can provide good support for the coating device 400 and maintain its stability. It should be noted that the tracked wheel itself is an existing component in the prior art, and will not be described in detail in this embodiment.

[0047] Specifically, it also includes a power source 500, which is located outside the pipe 100 and connected to the tracked wheel via a wire to provide energy for the movement of the tracked wheel.

[0048] The coating device 400 provided in this embodiment has a simple structure and low cost. It is lightweight and has a small load inside the pipe 100, which can better realize long-distance movement of the inner wall of the pipe 100 and achieve coating of the long pipe 100.

[0049] Example 2

[0050] Reference Figure 3 As shown, to facilitate the display of the internal structure, in Figure 3 The pipe 100 has been made transparent. This embodiment provides a plasma coating system for the inner wall of the pipe, including a coating apparatus 400, a seal 101, and a gas supply system 300 as described in Embodiment 1. (Refer to...) Figure 4 As shown, the nozzle 410 includes an anode plate 412, on the surface of which air holes 413 are formed, always facing the inner wall of the pipe 100. The sealing element 101 is installed at both ends of the pipe 100, forming a sealed space within the pipe 100. The gas supply system 300 includes a reaction gas supply component 301 and a gas guide supply component 303; the reaction gas supply component 301 communicates with the sealed space and is used to inject reaction gas into the sealed space. Specifically, the reaction gas supply component 301 communicates with the sealed space through a gas pipe 302, and the pipe 100 passes through the sealing element 101; the gas guide supply component 303 is connected to the nozzle 410 and communicates with the air holes 413 on the surface of the anode plate 412, and is used to spray gas flow onto the inner wall of the pipe 100. Both the reaction gas supply component 301 and the gas guide supply component 303 can be selected from existing accessories in the prior art.

[0051] It should be noted that the reaction gas is a gas carrying the powder of the reaction material. In this embodiment, the reaction material can be diamond, graphite, etc., and a diamond-like film is finally formed on the inner wall of the pipe 100, which has high hardness, high chemical inertness, low coefficient of friction and wear rate, as well as excellent corrosion resistance.

[0052] A sealed space is created by the sealing element 101, and reactive gas is introduced into the sealed space by the reactive gas supply component 301. During the coating process, since the nozzle 410 is equipped with an anode plate 412, the corresponding pipe 100 serves as the cathode, forming a plasma generation zone between the anode plate 412 and the cathode pipe 100. The gas supply component 303 ejects gas outward through the gas hole 413, which can guide the reactive plasma to deposit on the inner wall of the pipe 100, thereby improving the coating efficiency.

[0053] This embodiment demonstrates plasma-enhanced chemical vapor deposition (PECVD) on the inner wall of a pipe. Compared to conventional chemical vapor deposition (CVD), PECVD utilizes plasma to enhance the deposition process, enabling the deposition of higher-quality coatings at lower temperatures.

[0054] Specifically, it also includes a vacuum assembly 200, which comprises a vacuum generating unit 201 and a vacuum measuring device 202. The vacuum generating unit 201 is connected to the sealed space and is used to evacuate the sealed space; the vacuum measuring device 202 is used to measure the vacuum condition of the sealed space. By evacuating the sealed space, contaminants within the sealed space are removed, improving the adhesion, wear resistance, and chemical stability of the reactant materials. Both the vacuum generating unit 201 and the vacuum measuring device 202 can be selected from existing components in the prior art.

[0055] Specifically, in this embodiment, the vacuum generating unit 201 can be one or more of a mechanical pump, a Roots pump, and a turbomolecular pump. The vacuum measuring device 202 can be a compound vacuum gauge.

[0056] Specifically, continue to refer to Figure 4 As shown, the nozzle 410 also includes a motor 411, which is mounted on the limiter 406. The anode plate 412 is connected to the shaft of the motor 411 via a connector. The motor 411 drives the anode plate 412 to rotate, thereby causing the air holes 413 to uniformly spray airflow along the circumference of the inner wall of the pipe 100, thereby improving the uniformity of the coating.

[0057] Specifically, there are three anode plates 412, which are arranged around the axis of a rotating shaft, which is coaxial with the device body. In other embodiments, the number of anode plates may be one, two, four or more.

[0058] Specifically, the pipe 100 is supported on the ground or workbench by a support frame 102.

[0059] Specifically, in this embodiment, the sealing element 101 can be a magnetic fluid sealing flange.

[0060] Usage process:

[0061] The coating device 400 is placed inside the pipe 100, and the two ends of the pipe 100 are sealed by the sealing element 101. The corresponding wires and pipe 100 are then arranged.

[0062] The vacuum generator 201 is used to evacuate the sealed space to a vacuum state, and then the reaction gas is introduced into the sealed space through the reaction gas supply component 301.

[0063] The coating device 400 is driven by tracked wheels to move along the axis of the inner wall of the pipe 100. During the movement, the anode plate is driven by the motor 411 to rotate around the axis, and the air supply component 303 sprays air out through the air hole 413 to uniformly deposit the DLC coating inside the pipe 100.

[0064] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A coating device for the inner wall of a pipe, characterized in that, include: The device body includes a limiter, a connecting sleeve, and an elastic element; one end of the elastic element is connected to the limiter, and the other end is connected to the connecting sleeve, and the elastic element has an elastic force that brings the limiter and the connecting sleeve closer to each other; the limiter and the connecting sleeve are arranged coaxially. The movable assembly includes a first connecting rod, a second connecting rod, and a movable component; one end of the first connecting rod is hinged to a limiter, and the other end is connected to the movable component; one end of the second connecting rod is hinged to a connecting sleeve, and the other end is hinged to the first connecting rod; the movable component abuts against the inner wall of the pipe and is used to drive the device body to move; at least two sets of movable assemblies are arranged around the axis of the device body, such that the movable component abuts against the inner wall of the pipe, and the axis of the device body is coaxial with the pipe. The nozzle, mounted on the limiter and coaxially arranged with the device body, is used to coat the inner wall of the pipe.

2. The coating device for the inner wall of a pipe according to claim 1, characterized in that, The first link of each group of moving components has the same size, and the second link of each group of moving components also has the same size, so that the distance between the moving part of each group of moving components and the axis of the device body is equal.

3. The coating device for the inner wall of a pipe according to claim 1, characterized in that, The moving part is a tracked wheel.

4. A coating device for the inner wall of a pipe according to claim 3, characterized in that, It also includes a power source, which is connected to the tracked wheels via wires.

5. A coating device for the inner wall of a pipe according to claim 1, characterized in that, It includes three sets of moving components, which are evenly arranged around the axis of the device body.

6. A plasma coating system for the inner wall of a pipe, characterized in that, include: The coating apparatus according to any one of claims 1 to 5; the nozzle includes an anode plate, and the surface of the anode plate is provided with air holes; Sealing elements are installed at both ends of the pipe to create a sealed space inside the pipe; A gas supply system includes a reaction gas supply component and a gas guiding component; the reaction gas supply component is connected to a sealed space and is used to inject reaction gas into the sealed space; the gas guiding component is connected to a nozzle and communicates with the vent holes on the surface of the anode plate, and is used to spray gas flow into the inner wall of the pipe.

7. A plasma coating system for the inner wall of a pipe according to claim 6, characterized in that, It also includes a vacuum assembly, which includes a vacuum generating unit and a vacuum measuring device. The vacuum generating unit is connected to the sealed space and is used to evacuate the sealed space. The vacuum measuring device is used to measure the vacuum status of the sealed space.

8. A plasma coating system for the inner wall of a pipe according to claim 6, characterized in that, The nozzle also includes a motor, which is mounted on a limiter; the anode plate is connected to the motor shaft via a connector.

9. A plasma coating system for the inner wall of a pipe according to claim 8, characterized in that, The number of anode plates is three, and the three anode plates are arranged around the axis of the rotating shaft, which is coaxial with the device body.

10. A plasma coating system for the inner wall of a pipe according to claim 6, characterized in that, The sealing element is a magnetohydrodynamic sealing flange.

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