Thermal spraying method for circulating pipeline

Abstract

The invention relates to the technical field of thermal spraying, and discloses a thermal spraying method for a circulating pipeline, which comprises the following steps of: 1, inspecting raw materials; 2, pretreating the surface of the steel pipe; 3, blending the coating; 4, spraying preparation is conducted; 5, spraying operation is carried out; step 6, curing preparation; step 7, curing treatment; step 8, quality detection; and step 9, packaging a finished product. According to the thermal spraying method for the circulating pipeline, the cobalt powder sintering composition is added into the metal ceramic coating, and strict pretreatment and precise spraying and curing processes are combined, so that the wear resistance and the corrosion resistance of the coating of the circulating pipeline are improved, and the use requirements of the circulating pipeline under complex working conditions are better met.

Description

Technical Field

[0001] The invention relates to the technical field of thermal spraying, in particular to a thermal spraying method for a circulation pipeline. Background Art

[0002] In many industrial fields, such as chemical, petroleum, and electricity, circulation pipelines play a vital role in transporting various liquids, gases, or gas-liquid mixtures. Since pipelines are in harsh working environments for a long time, such as high temperature, high pressure, and highly corrosive media, the corrosion and wear problems of pipelines are extremely prominent. Although thermal spraying technology has achieved remarkable results in many fields, there are still some problems in practical applications.

[0003] When preparing coatings with certain specific requirements, the traditional thermal spraying process may cause problems such as insufficient coating adhesion, high porosity, and unsatisfactory wear and corrosion resistance. For example, the working conditions of circulating pipelines in some chemical production are relatively harsh. They not only need to withstand the erosion and corrosion of the medium, but also need to have good high temperature resistance. Existing thermal spray coatings may fall off and increase wear during long-term use, affecting the normal operation and service life of the pipeline.

[0004] For example, patent number CN118751429B discloses a thermal spraying equipment and method for annular parts. This patent mainly focuses on the improvement of the thermal spraying equipment and method for annular parts, and improves the quality and uniformity of the coating on the annular parts through a specific equipment structure and spraying process. However, there are differences between the thermal spraying method for circulating pipes and the thermal spraying method for circulating pipes targeted by the present invention in terms of application objects, process steps and technical effects.

[0005] Therefore, there is an urgent need for a thermal spraying method for circulating pipes. Summary of the invention

[0006] 1. Technical issues to be solved

[0007] In view of the deficiencies in the prior art, the present invention provides a thermal spraying method for a circulation pipe. The thermal spraying method for a circulation pipe of the present invention focuses on improving the wear resistance and corrosion resistance of the circulation pipe coating by adding a cobalt powder sintered composite to the metal ceramic coating and combining strict pretreatment, precise spraying and curing processes, so as to better meet the use requirements of the circulation pipe under complex working conditions and solve the problems raised by the background technology.

[0008] (II) Technical solution

[0009] To achieve the above-mentioned purpose, the present invention provides the following technical solution: A thermal spraying method for a circulation pipeline, comprising the following steps:

[0010] Step 1: Raw material inspection: strict quality inspection of the metal ceramic coating and cobalt powder sintered composite used for thermal spraying, check whether its component ratio, purity, and particle size distribution parameters meet the preset standards, and conduct appearance inspection, wall thickness measurement, and material composition analysis on the steel pipe raw materials to ensure that its quality is qualified and suitable for thermal spraying process;

[0011] Step 2: Pre-treatment of the steel pipe surface, using mechanical grinding, sandblasting or chemical cleaning to strictly remove rust and dust from the steel pipe surface, so that the surface roughness of the steel pipe reaches the preset range. The mechanical grinding tool is an electric grinder, and its speed can be adjusted in the range of 1000-5000 rpm. The sand material used for sandblasting is corundum, and the sand particle size is 0.5-2 mm;

[0012] Step 3: Coating preparation: accurately mix and prepare the metal ceramic coating and the cobalt powder sintered product according to a predetermined formula, wherein the metal phase in the metal ceramic coating is a nickel-chromium alloy and the ceramic phase is alumina, and the mass ratio thereof is 3:2-5:3. The mass proportion of the cobalt powder sintered product in the metal ceramic coating is 5%-15%, and a high-speed stirring device is used to stir at a speed of 500-1500 rpm for 10-30 minutes to ensure that the coating is evenly mixed;

[0013] Step 4: spraying preparation, load the prepared paint into the spraying device, adjust the spraying pressure of the spraying device to 0.3-0.8 MPa, the flow rate to 50-200 ml / min, and install the steel pipe on the rotatable bracket of the spraying device, and set the rotation speed of the steel pipe to 5-20 rpm;

[0014] Step 5: Spraying operation, using a spray gun to evenly spray on the pre-treated steel pipe surface at a predetermined pressure and flow rate, while combining roller coating and vacuum adsorption processes to make the metal ceramic coating evenly hot-melted on the inner wall and surface of the steel pipe. During the spraying process, the steel pipe rotates at a set speed, and the spraying process is carried out in a dust-free, constant temperature and humidity-controlled environment, with an ambient temperature of 20-30 degrees Celsius and a humidity of 40%-60%;

[0015] Step 6: Preparation for curing: transport the sprayed steel pipe to the entrance of the curing furnace, check whether the heating system and ventilation system of the curing furnace are operating normally, set the heating temperature range of the curing furnace to 200-400 degrees Celsius, the heating time to 30-120 minutes, and the ventilation system can adjust the ventilation volume, the ventilation volume range is 10-50 cubic meters / hour;

[0016] Step 7: Curing treatment: transport the steel pipe into the curing furnace and heat and cure it under a specific temperature curve and time cycle to make the coating fully melted, leveled and cured to form a hard anti-corrosion layer. During the curing process, the temperature sensor and ventilation volume adjustment device of the curing furnace are used to monitor and adjust the curing conditions in real time;

[0017] Step 8: Quality inspection: Use hardness testers, coating thickness measuring instruments, and adhesion testing equipment to inspect the quality of the cured coating to check whether the coating hardness reaches the preset value, whether the thickness is uniform, and whether the adhesion to the steel pipe surface is qualified. If the test fails, mark the unqualified products and analyze the reasons, take appropriate remedial measures or scrap them;

[0018] Step 9: Finished product packaging: Pack the circulating pipes that have passed the quality inspection using moisture-proof and collision-proof packaging materials, and mark the product specifications, production date, and batch information on the packaging.

[0019] Preferably, the raw material inspection in step one uses spectral analysis, particle size analyzer and chemical titration to detect the composition and purity of the metal ceramic coating and the cobalt powder sintered product, and uses ultrasonic flaw detection and magnetic particle flaw detection to detect internal defects of the steel pipe.

[0020] Preferably, the high-speed stirring equipment in step three is a planetary mixer, and its stirring paddle is made of stainless steel.

[0021] The top of described fixing plate is provided with a reciprocating screw rod, and the rod wall of described reciprocating screw rod is provided with a reciprocating slider, and the bottom of described reciprocating slider is fixed with a spray head, and the shaft wall of described rotating plate and described reciprocating screw rod are fixed with pulleys corresponding to positions, and the two pulleys are connected by belt transmission, and a receiving box is provided at the bottom of described fixing plate and located below the steel pipe, and a guide plate is fixedly provided inside the receiving box.

[0022] Preferably, the elastic moving mechanism includes a slide rail fixedly arranged on the top of the base, a slide rod is fixedly arranged inside the slide rail, a slider is arranged on the rod wall of the slide rod, the bottom of the movable plate is fixedly connected to the top of the slider, a spring is sleeved on the rod wall of the slide rod, and both ends of the spring are fixedly connected to the slider and the slide rail respectively.

[0023] Preferably, the clamping mechanism includes a clamping plate and a bolt, the clamping plate is an arc-shaped plate, and the clamping plate is symmetrically located inside the clamping sleeve, the bolt thread is arranged on the side wall of the clamping sleeve, and the end of the bolt is rotatably connected to the side wall of the clamping plate.

[0024] Preferably, the rolling coating device in step five uses a rolling brush made of rubber material with a hardness of 40-60 Shore A, which can effectively fill the uneven areas of spraying by the spray gun without damaging the coating. The vacuum degree of the vacuum adsorption device can be adjusted in the range of -0.05 to -0.09 MPa.

[0025] Preferably, the heating system of the curing furnace in step six adopts electric heating, and the heating element is a ceramic heating rod.

[0026] Preferably, the thickness of the plastic film in the packaging material in step nine is 0.1-0.3 mm, and the density of the foam board is 15-30 kg / m3.

[0027] Preferably, during the entire thermal spraying process of steps 1 to 9, each process parameter, equipment operating status and quality inspection results are recorded in detail to form a process file for tracing and optimizing the process.

[0028] (III) Beneficial effects

[0029] Compared with the prior art, the present invention provides a thermal spraying method for a circulation pipeline, which has the following beneficial effects:

[0030] 1. The circulating pipeline uses thermal spraying to significantly improve the coating performance. The addition of cobalt powder sintering products optimizes the performance of metal ceramic coatings, enhances the wear resistance and corrosion resistance of the coating, effectively resists corrosion and wear under complex working conditions, and extends the service life of the circulating pipeline. For example, in chemical production, it can better cope with corrosive media erosion and reduce the risk of pipeline damage.

[0031] 2. The circulation pipeline uses thermal spraying to optimize the process and stability. The precise coating mixing process ensures that the components are evenly distributed, so that the cobalt powder is fully dispersed in the coating, avoiding uneven components affecting the coating performance, ensuring the best coating protection effect everywhere, detailed spraying preparation and operation steps, as well as a stable spraying environment and reasonable parameter settings, ensure the uniformity and stability of the spraying. Roller coating and vacuum adsorption processes further improve the flatness, density and adhesion of the coating.

[0032] 3. The circulating pipeline is thermally sprayed to ensure the curing effect and quality inspection reliability. Strict monitoring during the curing preparation and process ensures that the coating is fully cured under specific conditions to form a hard and uniform anti-corrosion layer, optimize the physical and chemical properties of the coating, and improve hardness, wear resistance and corrosion resistance. Comprehensive quality inspection can accurately judge the coating quality, deal with unqualified products in a timely manner, ensure the reliable quality of the factory pipeline, and reduce failures and safety hazards caused by coating problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1This is a schematic diagram of the structure of the spraying device proposed by the present invention;

[0034] Figure 2 for Figure 1 A top view of the intermediate material box;

[0035] Figure 3 for Figure 1 A schematic diagram of the structure in which the moving plate is connected to the slide rail;

[0036] Figure 4 for Figure 1 Side view of the middle snap-in socket.

[0037] In the figure: In the figure: 1. fixed frame; 2. fixed plate; 3. movable plate; 4. rotating shaft; 5. snap-on sleeve; 6. motor; 7. reciprocating screw rod; 8. reciprocating slider; 9. spray head; 10. pulley; 11. belt; 12. material receiving box; 13. guide plate; 14. slide rail; 15. slide rod; 16. slider; 17. spring; 18. splint; 19. bolt. DETAILED DESCRIPTION

[0038] 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.

[0039] See also Figure 1-4 , a thermal spraying method for a circulation pipe, comprising the following steps:

[0040] Step 1: Raw material inspection: strict quality inspection of the metal ceramic coating and cobalt powder sintered product used for thermal spraying, check whether their composition ratio, purity, and particle size distribution parameters meet the preset standards, and conduct appearance inspection, wall thickness measurement, and material composition analysis on the steel pipe raw materials to ensure that they are of qualified quality and suitable for thermal spraying process. Raw material inspection uses spectral analysis, particle size analyzer, and chemical titration to detect the composition and purity of metal ceramic coating and cobalt powder sintered product, and ultrasonic flaw detection and magnetic particle flaw detection are used to detect internal defects of steel pipes;

[0041] Step 2: Pre-treatment of the steel pipe surface, using mechanical grinding, sandblasting or chemical cleaning to strictly remove rust and dust from the steel pipe surface, so that the surface roughness of the steel pipe reaches the preset range. The mechanical grinding tool is an electric grinder, and its speed can be adjusted in the range of 1000-5000 rpm. The sand material used for sandblasting is corundum, and the sand particle size is 0.5-2 mm;

[0042] Step 3: coating preparation, according to a predetermined formula, the metal ceramic coating and the cobalt powder sintered product are accurately mixed and prepared, wherein the metal phase in the metal ceramic coating is a nickel-chromium alloy, and the ceramic phase is alumina, and the mass ratio thereof is 3:2-5:3, and the mass proportion of the cobalt powder sintered product in the metal ceramic coating is 5%-15%, and a high-speed stirring device is used to stir at a speed of 500-1500 rpm for 10-30 minutes to ensure that the coating is evenly mixed. The high-speed stirring device is a planetary mixer, and its stirring paddle is made of stainless steel;

[0043] Step 4: spraying preparation, load the prepared paint into the spraying device, adjust the spraying pressure of the spraying device to 0.3-0.8 MPa, the flow rate to 50-200 ml / min, and install the steel pipe on the rotatable bracket of the spraying device, and set the rotation speed of the steel pipe to 5-20 rpm;

[0044] Step 5: Spraying operation, using a spray gun to spray evenly on the pre-treated steel pipe surface with a predetermined pressure and flow rate, and combining the rolling coating and vacuum adsorption process to make the metal ceramic coating evenly hot-melted on the inner wall and surface of the steel pipe. During the spraying process, the steel pipe rotates at a set speed, and the spraying process is carried out in a dust-free, constant temperature and humidity-controlled environment. The ambient temperature is 20-30 degrees Celsius and the humidity is 40%-60%. The roller coating device uses a rubber roller brush with a hardness of 40-60 Shore A, which can effectively fill the uneven spraying of the spray gun without damaging the coating. The vacuum degree of the vacuum adsorption device can be adjusted in the range of -0.05 to -0.09 MPa, which can effectively remove bubbles in the coating;

[0045] Step 6: Preparation for curing. Transport the sprayed steel pipe to the entrance of the curing furnace. Check whether the heating system and ventilation system of the curing furnace are operating normally. Set the heating temperature range of the curing furnace to 200-400 degrees Celsius and the heating time to 30-120 minutes. The ventilation system can adjust the ventilation volume, and the ventilation volume range is 10-50 cubic meters / hour. The heating system of the curing furnace adopts electric heating, and the heating element is a ceramic heating rod, which has the characteristics of fast heating and high thermal efficiency.

[0046] Step 7: Curing treatment: transport the steel pipe into the curing furnace and heat and cure it under a specific temperature curve and time cycle to make the coating fully melted, leveled and cured to form a hard anti-corrosion layer. During the curing process, the temperature sensor and ventilation volume adjustment device of the curing furnace are used to monitor and adjust the curing conditions in real time;

[0047] Step 8: Quality inspection: Use hardness testers, coating thickness measuring instruments, and adhesion testing equipment to inspect the quality of the cured coating to check whether the coating hardness reaches the preset value, whether the thickness is uniform, and whether the adhesion to the steel pipe surface is qualified. If the test fails, mark the unqualified products and analyze the reasons, take appropriate remedial measures or scrap them;

[0048] Step 9: Finished product packaging: Packaging of circulating pipes that have passed quality inspection, using moisture-proof and collision-proof packaging materials, marking product specifications, production date, and batch information on the packaging. The thickness of the plastic film in the packaging material is 0.1-0.3 mm, and the density of the foam board is 15-30 kg / cubic meter.

[0049] The spraying device includes a fixed frame 1, the bottom of the fixed frame 1 is fixedly provided with a fixed plate 2 and a movable plate 3 on both sides of the bottom, the bottom of the fixed plate 2 is fixedly connected to the base 1, and an elastic moving mechanism is provided between the bottom of the movable plate 3 and the base 1, and a rotating shaft 4 is rotatably provided on the opposite sides of the fixed plate 2 and the movable plate 3, and a clamping sleeve 6 is fixedly provided on the opposite ends of the two rotating shafts 5, a steel pipe is provided between the two clamping sleeves 6, and a clamping mechanism for fixing one end of the steel pipe is provided inside the clamping sleeve 6, a motor 6 is fixedly provided on the side wall of the fixed plate 2, and the output end of the motor 6 is fixedly connected to one end of the rotating shaft 4, a reciprocating screw rod 7 is rotatably provided on the top of the fixed frame 1, and a reciprocating slider 8 is provided on the rod wall of the reciprocating screw rod 7, and a spray head 9 is fixedly provided on the bottom of the reciprocating slider 8, and the shaft wall of the rotating shaft 4 and the rod wall of the reciprocating screw rod 7 are fixedly provided with a position Corresponding pulleys 10, the two pulleys 10 are connected by belt 11 transmission, a receiving box 12 is provided at the bottom of the fixed frame 1 and below the steel pipe, and a guide plate 13 is fixed inside the receiving box 12. When spraying the steel pipe, the movable plate 3 is first pulled to one side, and then the steel pipe is placed horizontally between the clamping sleeves 5 on both sides, and then the external force on the movable plate 3 is released. The movable plate 3 is reset under the action of elastic force, so that the clamping sleeves 5 on both sides tighten the two ends of the steel pipe, and then the two ends of the steel pipe are fixed by the clamping mechanism, and finally the motor 6 is turned on to work. The motor 6 can rotate the rotating shaft 4 and the fixed steel pipe. At the same time, the reciprocating screw 7 is rotated through the cooperation of the pulley 10 and the belt 11, so that the reciprocating slider 8 can move back and forth left and right, so that the spray head 9 can spray the outer wall of the steel pipe evenly.

[0050] The elastic moving mechanism includes a slide rail 14 fixedly arranged on the top of the base 1, a slide rod 15 fixedly arranged inside the slide rail 14, a slider 16 arranged on the rod wall of the slide rod 15, the bottom of the moving plate 3 is fixedly connected to the top of the slider 16, a spring 17 is sleeved on the rod wall of the slide rod 15, and the two ends of the spring 17 are respectively fixedly connected to the slider 16 and the slide rail 14. When the moving plate 3 is pulled, the slider 16 moves on the slide rod 15 and inside the slide rail 14, and at the same time, the slider 16 compresses the spring 17. When the external force on the moving plate 3 is released, the elastic force of the spring 17 causes the moving plate 3 to quickly reset.

[0051] The clamping mechanism includes a clamping plate 18 and a bolt 19. The clamping plate 18 is an arc-shaped plate, and the clamping plate 18 is symmetrically located inside the clamping sleeve 5. The bolt 19 is threaded on the side wall of the clamping sleeve 5, and the end of the bolt 19 is rotatably connected to the side wall of the clamping plate 18. After the end of the steel pipe is inserted into the inside of the clamping sleeve 5, the bolt 19 is manually tightened with a wrench. When the bolt 19 moves spirally, it drives the clamping plate 18 to move and clamps the steel pipe.

[0052] During the entire thermal spraying process from step 1 to step 9, each process parameter, equipment operating status and quality inspection results are recorded in detail to form a process file for traceability and process optimization.

[0053] In summary, when in use, select a steel pipe with a diameter of 100 mm and a length of 5 meters. First, use an electric grinder to mechanically grind the surface of the steel pipe at a speed of 3000 rpm to remove surface rust and impurities, so that the surface roughness reaches about 50 microns. Then, the metal ceramic coating (wherein the mass ratio of nickel-chromium alloy to alumina is 4:3, and the mass proportion of cobalt powder sintered composite is 10%) is loaded into the spraying device, and the steel pipe is sprayed at a spraying pressure of 0.5 MPa and a flow rate of 100 ml / min. At the same time, the steel pipe rotates at a speed of 10 rpm. The spraying process is combined with rolling and vacuum adsorption processes. Finally, the sprayed steel pipe is placed in a curing furnace and heated at 300 degrees Celsius for 60 minutes. The ventilation volume is set to 30 cubic meters / hour. After curing, a circulating pipeline with excellent corrosion resistance and wear resistance is obtained.

[0054] It should be noted that the term "comprises" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or device that includes a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such process, method, article, or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article, or device that includes the element.

[0055] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A thermal spraying method for a circulation pipeline, characterized in that: The following steps are involved: Step 1: Raw material inspection: strict quality inspection of the metal ceramic coating and cobalt powder sintered composite used for thermal spraying, check whether its component ratio, purity, and particle size distribution parameters meet the preset standards, and conduct appearance inspection, wall thickness measurement, and material composition analysis on the steel pipe raw materials to ensure that its quality is qualified and suitable for thermal spraying process; Step 2: Pre-treatment of the steel pipe surface, using mechanical grinding, sandblasting or chemical cleaning to strictly remove rust and dust from the steel pipe surface, so that the surface roughness of the steel pipe reaches the preset range. The mechanical grinding tool is an electric grinder, and its speed can be adjusted in the range of 1000-5000 rpm. The sand material used for sandblasting is corundum, and the sand particle size is 0.5-2 mm; Step 3: Coating preparation: accurately mix and prepare the metal ceramic coating and the cobalt powder sintered product according to a predetermined formula, wherein the metal phase in the metal ceramic coating is a nickel-chromium alloy and the ceramic phase is alumina, and the mass ratio thereof is 3:2-5:

3. The mass proportion of the cobalt powder sintered product in the metal ceramic coating is 5%-15%, and a high-speed stirring device is used to stir at a speed of 500-1500 rpm for 10-30 minutes to ensure that the coating is evenly mixed; Step 4: spraying preparation, load the prepared paint into the spraying device, adjust the spraying pressure of the spraying device to 0.3-0.8 MPa, the flow rate to 50-200 ml / min, and install the steel pipe on the rotatable bracket of the spraying device, and set the rotation speed of the steel pipe to 5-20 rpm; Step 5: Spraying operation, using a spray gun to evenly spray on the pre-treated steel pipe surface at a predetermined pressure and flow rate, while combining roller coating and vacuum adsorption processes to make the metal ceramic coating evenly hot-melted on the inner wall and surface of the steel pipe. During the spraying process, the steel pipe rotates at a set speed, and the spraying process is carried out in a dust-free, constant temperature and humidity-controlled environment, with an ambient temperature of 20-30 degrees Celsius and a humidity of 40%-60%; Step 6: Preparation for curing: transport the sprayed steel pipe to the entrance of the curing furnace, check whether the heating system and ventilation system of the curing furnace are operating normally, set the heating temperature range of the curing furnace to 200-400 degrees Celsius, the heating time to 30-120 minutes, and the ventilation system can adjust the ventilation volume, the ventilation volume range is 10-50 cubic meters / hour; Step 7: Curing treatment: transport the steel pipe into the curing furnace and heat and cure it under a specific temperature curve and time cycle to make the coating fully melted, leveled and cured to form a hard anti-corrosion layer. During the curing process, the temperature sensor and ventilation volume adjustment device of the curing furnace are used to monitor and adjust the curing conditions in real time; Step 8: Quality inspection: Use hardness testers, coating thickness measuring instruments, and adhesion testing equipment to inspect the quality of the cured coating to check whether the coating hardness reaches the preset value, whether the thickness is uniform, and whether the adhesion to the steel pipe surface is qualified. If the test fails, mark the unqualified products and analyze the reasons, take appropriate remedial measures or scrap them; Step 9: Finished product packaging: Pack the circulating pipes that have passed the quality inspection using moisture-proof and collision-proof packaging materials, and mark the product specifications, production date, and batch information on the packaging.

2. A thermal spraying method for a circulation pipeline according to claim 1, characterized in that: The raw material inspection in step 1 uses spectral analysis, particle size analyzer and chemical titration to detect the composition and purity of the metal ceramic coating and the cobalt powder sintering product, and uses ultrasonic flaw detection and magnetic particle flaw detection to detect internal defects of the steel pipe.

3. A thermal spraying method for a circulation pipeline according to claim 1, characterized in that: The high-speed stirring equipment in step three is a planetary mixer, and its stirring paddle is made of stainless steel.

4. A thermal spraying method for a circulation pipeline according to claim 1, characterized in that: The spraying device in step 4 comprises a fixed frame (1), the bottom of the fixed frame (1) is fixedly provided with a fixed plate (2) and a movable plate (3) on both sides of the bottom, the bottom of the fixed plate (2) is fixedly connected to the base (1), an elastic moving mechanism is provided between the bottom of the movable plate (3) and the base (1), a rotating shaft (4) is rotatably provided on the opposite sides of the fixed plate (2) and the movable plate (3), a clamping sleeve (6) is fixedly provided on the opposite ends of the two rotating shafts (5), a steel pipe is provided between the two clamping sleeves (6), and a clamping mechanism for fixing one end of the steel pipe is provided inside the clamping sleeve (6), and the side wall of the fixed plate (2) is fixed A motor (6) is provided, and the output end of the motor (6) is fixedly connected to one end of the rotating shaft (4); a reciprocating screw rod (7) is provided on the top of the fixed frame (1) for horizontal rotation; a reciprocating slider (8) is provided on the rod wall of the reciprocating screw rod (7); a spray head (9) is fixedly provided on the bottom of the reciprocating slider (8); pulleys (10) corresponding to the positions are fixedly provided on the shaft wall of the rotating shaft (4) and the rod wall of the reciprocating screw rod (7); the two pulleys (10) are connected by a belt (11) for transmission; a material receiving box (12) is provided at the bottom of the fixed frame (1) and below the steel pipe, and a guide plate (13) is fixedly provided inside the material receiving box (12).

5. A thermal spraying method for a circulation pipeline according to claim 4, characterized in that: The elastic moving mechanism comprises a slide rail (14) fixedly arranged on the top of the base (1); a slide rod (15) is fixedly arranged inside the slide rail (14); a slide block (16) is arranged on the rod wall of the slide rod (15); the bottom of the moving plate (3) is fixedly connected to the top of the slide block (16); a spring (17) is sleeved on the rod wall of the slide rod (15); and two ends of the spring (17) are respectively fixedly connected to the slide block (16) and the slide rail (14).

6. A thermal spraying method for a circulation pipeline according to claim 4, characterized in that: The clamping mechanism comprises a clamping plate (18) and a bolt (19); the clamping plate (18) is an arc-shaped plate and is symmetrically located inside the clamping sleeve (5); the bolt (19) is threadedly arranged on the side wall of the clamping sleeve (5), and the end of the bolt (19) is rotatably connected to the side wall of the clamping plate (18).

7. A thermal spraying method for a circulation pipeline according to claim 1, characterized in that: The roller coating device in step 5 uses a rubber roller brush with a hardness of 40-60 Shore A, which can effectively fill the uneven areas of spraying by the spray gun without damaging the coating. The vacuum degree of the vacuum adsorption device can be adjusted in the range of -0.05 to -0.09 MPa.

8. The thermal spraying method for a circulation pipeline according to claim 1, characterized in that: The heating system of the curing furnace in step six adopts electric heating, and the heating element is a ceramic heating rod.

9. A thermal spraying method for a circulation pipeline according to claim 1, characterized in that: The thickness of the plastic film in the packaging material in step nine is 0.1-0.3 mm, and the density of the foam board is 15-30 kg / m3.

10. The thermal spraying method for a circulation pipeline according to claim 1, characterized in that: During the entire thermal spraying process from step 1 to step 9, each process parameter, equipment operating status and quality inspection result are recorded in detail to form a process file for tracing and optimizing the process.

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