Spraying method for metal insulation automatic production line

Abstract

The invention provides a spraying method for a metal insulation automatic production line. The method comprises the following steps that water pressure detection is conducted on an induction coil before the induction coil is guided into the production line, and a welding connector is checked; dirty, burr and welding slag parts on the surface of the induction coil are treated, polished and cleaned up; adjusting and correcting the turn-to-turn size of the induction coil, sealing the induction coil, a workpiece water nozzle and a pipe orifice bolt, and putting the induction coil, the workpiece water nozzle and the pipe orifice bolt into a drying room; an induction coil is heated and then subjected to heat preservation, the state of a water nozzle sealing object is checked, and the water nozzle sealing object is placed in an insulating powder spraying room after no abnormity exists; setting corresponding spraying parameters according to the specification of the induction coil to comprehensively spray the inside and outside of the induction coil; and putting the induction coil sprayed with the insulating powder into a drying room for baking and curing, and detecting the insulativity of the fluidized and cured induction coil by using an electric spark leak detector.

Description

Technical Field

[0001] The invention belongs to the field of fully automatic insulation powder spraying for sensor insulation processing, and in particular relates to a spraying method for a metal insulation automatic production line. Background Art

[0002] The medium frequency furnace is the main equipment for heating and melting metals. It is widely used in the foundry industry. It uses the principle of electromagnetic induction to heat and melt metals through frequency conversion devices and induction coils. The induction coil is one of the core components of the medium frequency furnace. It undertakes the important mission of converting electrical energy into thermal energy. The performance of the induction coil directly determines the operating status of the entire medium frequency furnace equipment. The insulation performance of the induction coil is one of the important prerequisites for the smooth operation of the medium frequency furnace. If the insulation of the induction coil is not handled properly, there will be very serious problems such as leakage, sparking, short circuit, abnormal noise of the induction coil, and equipment damage. Therefore, it is very important to insulate the induction coil to ensure that the induction coil has excellent insulation performance.

[0003] There are three main ways to insulate the induction coil of the original medium frequency furnace: using air insulation to pull the turns of the induction coil apart and leave a certain gap; using thin insulating plates to make insulating washers, surrounding the circumference of the coil, and padding insulating washers between all copper tube turns; wrapping the induction coil with glass ribbon, then brushing insulating paint on the surface and directly air drying;

[0004] The problems with the original insulation treatment method of the induction coil of the medium frequency furnace: the leakage of air insulation is serious, it is easy to ignite, and it affects production safety. It can be used in places where low-temperature heating or heating requirements are not strict; the insulating gasket is easy to loosen and fall off between the turns of the copper tube, and other parts of the copper tube are not insulated, which affects the production and use of the equipment. The insulation is easy to age, the glass ribbon is easy to fall off, the insulation performance of the induction coil is reduced, and ignition occurs, which affects production safety. The refractory materials that need to be removed for reprocessing the insulation not only waste manpower and material resources, but also make it impossible to carry out normal production. Moreover, when the medium frequency furnace is in a harsh working environment, dust and iron filings are easily attached to the surface of the coil. The three methods of the original induction coil insulation treatment cannot effectively insulate the turns between the coils, and the coils are prone to serious problems such as ignition, leakage, and short circuit. Summary of the invention

[0005] The present invention provides a spraying method for a metal insulation automated production line, which solves the problems existing in the old insulation treatment of the induction coil: the insulation is easy to age and fall off, the insulation performance is low, it cannot adapt to harsh working conditions, and it is easy to cause sparks, leakage, short circuit and serious production safety problems.

[0006] The technical solution of the present invention is implemented as follows: a spraying method for a metal insulation automated production line, the method comprising the following steps:

[0007] Before the induction coil is introduced into the production line, the water pressure test is carried out on the induction coil, the sealing and surface of the induction coil are preliminarily tested, and the welding interface of the induction coil is tested simultaneously; after the water pressure test is completed, the dirty, burred and weld slag parts on the surface of the induction coil are processed and polished, and the impurities and dust attached to the induction coil are cleaned, and the weld slag and burr parts after processing are rechecked;

[0008] Adjust the turn spacing of the induction coil and calibrate the turn-to-turn size of the induction coil. After the calibration is completed, seal the induction coil and the workpiece water nozzle and pipe mouth bolts and put them into the drying room;

[0009] Heat the induction coil and keep it warm. Take it out and check the status of the nozzle seal. If it is detached or damaged, replace it in time. Check that there is no abnormality in the seal of the induction coil and then put it into the insulation powder spraying room. Turn on the automatic insulation powder spraying equipment to spray all parts of the surface of the induction coil.

[0010] When performing insulation spraying, place the prepared induction coil at the center of the stage: adjust the front and rear positions of the external spray gun, start a low-speed test run after the preparation is completed, set the middle spray gun and the external spray gun at the start and end positions of the up and down movement, turn on the rotating stage to confirm that the spray device operation has no interference with the induction coil, and then start the spray device normally, so that the end face of the induction coil in the circumferential direction is sprayed with insulation powder, and set the corresponding spray parameters according to the specifications of the induction coil;

[0011] The induction coil sprayed with insulating powder is placed in a drying room and baked at 170°C for 15 minutes. The insulation of the induction coil after fluidized curing is tested with an electric spark leak detector.

[0012] This method conducts a comprehensive hydraulic test on the induction coil before it is introduced into the production line, including inspection of the sealing, surface and welding interface. This comprehensive early inspection approach greatly improves the safety performance of the induction coil and reduces equipment failures, which are often overlooked or simplified in traditional methods. Secondly, the surface treatment of the induction coil is very meticulous, including not only cleaning of dirt, burrs and welding slag, but also special emphasis on cleaning of impurities and dust, and re-inspection.

[0013] This multi-step, high-standard surface treatment ensures the quality and uniformity of subsequent spraying, far exceeding the rough treatment of traditional methods. This method places special emphasis on the adjustment and verification of the induction coil turn spacing, which is critical to ensuring the performance of the coil. Traditional methods may ignore this step, resulting in unstable coil performance.

[0014] In the preparation work before spraying, the method adopts drying room heating and heat preservation treatment, and pays special attention to checking the status of the nozzle seal. This meticulous preparation helps to improve the adhesion and uniformity of the spraying, which is not available in traditional methods. The spraying process adopts automated equipment and specifies the position adjustment and operation parameters of the spray gun in detail. This precise control greatly improves the consistency and quality of the spraying. In particular, the use of a rotating stage ensures uniform spraying in the circumferential direction, which is difficult to achieve in manual operation.

[0015] The baking and curing process after spraying gives specific temperature and time parameters (170℃ baking and curing for 15 minutes). This precise process control helps to achieve the best insulation effect. Finally, the final inspection is carried out using an electric spark leak detector to ensure that the insulation performance of the product meets the standards. This comprehensive quality control system, from raw material inspection to final product inspection, creates a highly accurate, reliable and repeatable production process.

[0016] This method creates a highly accurate and reliable automated production process for metal insulation through comprehensive preliminary testing, fine surface treatment, precise parameter control and comprehensive quality inspection. It not only solves the limitations of traditional methods in quality control and consistency, but also improves production efficiency and product quality through automation and precise control. This method reflects the important trend of industrial production towards high precision, high reliability and automation, and has the potential to become a new standard for metal insulation production.

[0017] As a preferred embodiment, when calibrating the inter-turn dimensions of the induction coil, the calibration error is controlled within 0.5 mm, and the surface flatness is controlled within 0.5 mm.

[0018] As a preferred embodiment, after the induction coil, the workpiece water nozzle and the pipe mouth bolt are sealed and placed in a drying room, the drying room temperature is increased to 230°C and maintained for at least one hour so that the drying room temperature is controlled between 225°C and 235°C.

[0019] As a preferred embodiment, after setting the corresponding spraying parameters according to the specifications of the induction coil, the induction coil is placed in a drying room, and after the drying room is heated to 180 degrees, the induction coil is taken out and turned over, and then sprayed for the second time, and the sealant is removed after the spraying is completed.

[0020] As a preferred embodiment, after placing the prepared coil at the center of the stage, the insulating powder spraying device controls the position of the middle insulating powder spray gun of the insulating spraying device so that the middle insulating powder spray gun and the inner surface of the induction coil are within a set standard range.

[0021] After adopting the above technical scheme, the beneficial effects of the present invention are as follows: through comprehensive preliminary detection and fine surface treatment, the quality and reliability of the final product are greatly improved; accurate spraying process and curing parameter control ensure the uniformity and stability of the insulation layer, and significantly improve the insulation performance of the induction coil; automated spraying equipment and precise process control reduce human operation errors and improve production speed and efficiency; comprehensive preliminary detection and multi-step quality control significantly reduce the rework rate, save time and material costs; automated equipment and standardized processes ensure high consistency of products, which is conducive to large-scale production; precise process control reduces material waste and improves resource utilization efficiency; precise adjustment and verification of the induction coil turn spacing ensures that the electrical performance of the product meets the design requirements; high-quality insulation spraying and curing process improves the durability of the product and extends the service life; the ability to perform corresponding spraying according to induction coils of different specifications enhances the adaptability and flexibility of the production line; a comprehensive quality control system from raw material detection to final product inspection ensures the traceability and reliability of product quality; high-quality insulation treatment improves the electrical safety of the product and reduces potential risks during use; this advanced production method promotes technological innovation, sets new standards for the industry, and promotes technological progress in the entire industry. Overall, this approach not only improves product quality and production efficiency, but also reduces costs, enhances product performance and safety, and provides companies with a significant competitive advantage. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 The present invention is a flow chart of the method. DETAILED DESCRIPTION

[0024] 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.

[0025] Example:

[0026] like Figure 1 As shown, a spraying method for a metal insulation automated production line comprises the following steps:

[0027] Before the induction coil is introduced into the production line, the water pressure test is carried out on the induction coil, the sealing and surface of the induction coil are preliminarily tested, and the welding interface of the induction coil is tested simultaneously; after the water pressure test is completed, the dirty, burred and weld slag parts on the surface of the induction coil are processed and polished, and the impurities and dust attached to the induction coil are cleaned, and the weld slag and burr parts after processing are rechecked;

[0028] Adjust the turn spacing of the induction coil and calibrate the turn-to-turn size of the induction coil. After the calibration is completed, seal the induction coil and the workpiece water nozzle and pipe mouth bolts and put them into the drying room;

[0029] Heat the induction coil and keep it warm. Take it out and check the status of the nozzle seal. If it is detached or damaged, replace it in time. Check that there is no abnormality in the seal of the induction coil and then put it into the insulation powder spraying room. Turn on the automatic insulation powder spraying equipment to spray all parts of the surface of the induction coil.

[0030] When performing insulation spraying, place the prepared induction coil at the center of the stage: adjust the front and rear positions of the external spray gun, start a low-speed test run after the preparation is completed, set the middle spray gun and the external spray gun at the start and end positions of the up and down movement, turn on the rotating stage to confirm that the spray device operation has no interference with the induction coil, and then start the spray device normally, so that the end face of the induction coil in the circumferential direction is sprayed with insulation powder, and set the corresponding spray parameters according to the specifications of the induction coil;

[0031] The induction coil sprayed with insulating powder is placed in a drying room and baked at 170°C for 15 minutes. The insulation of the induction coil after fluidized curing is tested with an electric spark leak detector.

[0032] This method conducts a comprehensive hydraulic test on the induction coil before it is introduced into the production line, including inspection of the sealing, surface and welding interface. This comprehensive early inspection approach greatly improves the safety performance of the induction coil and reduces equipment failures, which are often overlooked or simplified in traditional methods. Secondly, the surface treatment of the induction coil is very meticulous, including not only cleaning of dirt, burrs and welding slag, but also special emphasis on cleaning of impurities and dust, and re-inspection.

[0033] The fully automatic insulation powder spraying production line for inductor insulation treatment has greatly improved the insulation strength of the induction coil of the medium frequency furnace, and completely solved the problems of insulation aging, short circuit between turns and sparking of the induction coil, so that the medium frequency furnace can work normally for a long time, avoiding the problem of frequent furnace construction and waste of refractory materials due to insulation problems in the past, greatly saving manpower and material resources and ensuring production safety.

[0034] The patent of this invention - fully automatic insulation powder spraying production line for sensor insulation treatment, is mainly composed of three parts: preparation work before sensor insulation powder spraying; fully automatic spraying of sensor insulation powder; curing adhesion and insulation strength detection of sensor insulation powder after spraying.

[0035] Preparation work before spraying the sensor insulation powder. Mainly involves the water pressure test (sealing test) of the sensor coil, the treatment of dirt, burrs and welding slag on the coil surface, the adjustment of the coil turn spacing and the sealing treatment of related parts; the sensor insulation powder is fully automatically sprayed. Mainly involves the heating treatment of the sensor coil and the spraying of insulation powder on the coil surface; the curing adhesion and insulation strength test of the sensor insulation powder after spraying. After the insulation powder on the sensor surface is sprayed, it is placed in a drying room to solidify the insulation powder attached to the coil surface and tightly connect to the coil. Use special instruments to test the insulation strength of the coil surface after spraying insulation, and strengthen the weak insulation parts.

[0036] The specific operation method of this application document is as follows:

[0037] Conduct water pressure test on the coil to ensure that there is no leakage in all welding interfaces of the coil; clean the dirt, burrs and welding slag on the surface of the coil to prevent insulation powder from falling off after adhering to the coil and the welding slag and burrs from not being properly treated, which may cause the coil to spark; adjust the coil turn spacing and seal the relevant parts. Correct the coil turn size to ensure that the error is not greater than 0.5 mm, and the surface flatness is not greater than 0.5 mm. Seal the coil and workpiece nozzles, pipe mouth bolts to ensure that the seals will not fall off (it is best to tighten with thin wire), and put them in the drying room. Heat the induction coil to 230℃, keep warm for 1h, take it out and check whether the nozzle seal is falling off or damaged, and replace it in time.

[0038] Check that the induction coil seal is normal and then quickly put it into the insulation powder spraying room, turn on the automatic insulation powder spraying equipment to spray all parts of the coil surface. The insulation powder spraying device mainly includes a rotating stage, a central spray gun, and an external spray gun. When performing insulation spraying, place the prepared coil in the center of the stage (the distance from the central insulation powder spray gun to the inner surface of the coil is the same); adjust the front and rear positions of the external spray gun to ensure that there is a sufficient safe distance from the spray gun head to the outside of the coil. After everything is ready, start a low-speed trial run, set the start and end positions of the central spray gun and the external spray gun up and down, turn on the rotating stage, so that all surfaces of the coil in the circumferential direction can be sprayed with insulation powder. After confirming that the spraying device does not interfere with the coil, start the spraying device normally. Spray for 15-30 minutes according to the size of the coil, then put it in the drying room and heat it to 180 degrees, take out the coil and turn it over twice for spraying, and remove the seal immediately after completion.

[0039] Finally, the coils sprayed with insulation powder are placed in a drying room at 170℃ for 15 minutes to ensure the strength of the insulation layer. After fluidized curing, the sensor is tested for insulation with an electric spark leak detector to ensure that the withstand voltage of all fluidized insulation layers exceeds 30,000V.

[0040] The insulation treatment of the induction coil is an important part of the smooth operation of the medium frequency furnace. Spraying insulation powder on the surface of the induction coil for effective insulation treatment is crucial for the normal use of the medium frequency furnace. The patent of this invention - the fully automatic insulation powder spraying production line for inductor insulation treatment can effectively and quickly attach insulation powder of uniform thickness to all surfaces of the inductor, ensuring the insulation strength of all parts of the coil surface. It effectively avoids sparking, leakage, short circuit and other problems in the induction coil, which not only ensures production safety and enables the medium frequency furnace to operate efficiently for a long time, but also plays a very important role in promoting the development of medium frequency furnaces towards large-scale and high-power.

[0041] When calibrating the inter-turn dimensions of the induction coil, the calibration error is controlled within 0.5 mm, and the surface flatness is controlled within 0.5 mm.

[0042] Controlling the calibration error of the induction coil turn-to-turn dimension within 0.5 mm reflects extremely high precision requirements. Traditional calibration methods may allow a larger error range, such as 1 mm or more. This control accurate to 0.5 mm not only greatly improves the performance consistency of the induction coil, but also significantly improves its electrical characteristics. The high-precision turn-to-turn distance ensures that the induction coil can generate a more uniform and stable electromagnetic field during use, which is crucial to improving the overall performance and efficiency of the equipment.

[0043] The surface flatness is also controlled within 0.5 mm, which also reflects the extremely high processing accuracy. Traditional technology may only focus on the turn-to-turn distance, but ignore the importance of surface flatness. The highly flat surface not only helps the subsequent insulation spraying process to ensure the uniformity and adhesion of the insulation layer, but also reduces partial discharge or hot spots that may be generated during use due to uneven surfaces. This dual high-precision control (turn-to-turn size and surface flatness) creates an all-round quality control system.

[0044] It not only focuses on the geometric dimensions of the coil, but also takes into account the surface quality, which is a comprehensive consideration that is rare in traditional methods. Such precision control places higher demands on production equipment and process flow, and may require the use of more advanced measuring instruments and processing equipment, such as high-precision coordinate measuring machines or laser scanners. This high standard not only improves product quality, but also promotes the technological upgrade of the entire production line.

[0045] Such strict precision control also lays the foundation for subsequent automated production. When the basic components reach such high precision, the subsequent assembly and testing processes can be more precise and reliable, which is conducive to the automation and intelligence of the entire production process. This high-precision control also reflects the consideration of the product's full life cycle performance. The precise turn-to-turn distance and flat surface not only ensure the initial performance, but also help to extend the service life of the product and reduce performance degradation caused by geometric deformation or surface defects.

[0046] After the induction coil, the workpiece water nozzle and the pipe mouth bolts are sealed and placed in the drying room, the drying room temperature is increased to 230°C and maintained for at least one hour so that the drying room temperature is controlled between 225°C and 235°C.

[0047] The drying room temperature is raised to 230℃, which is far beyond the temperature range of traditional baking treatment. Conventional baking treatment is usually carried out at around 100-150℃. The induction coil is placed in the drying room and baked for one hour to ensure that the induction coil is heated evenly and the insulation powder has strong enough adhesion on the coil surface.

[0048] Maintaining a treatment time of at least one hour reflects precise control of the process. This long-term high-temperature treatment ensures that heat can fully penetrate every part of the induction coil, including the internal structure and the sealing treatment area. This not only helps to fully dry the material, but also controls the temperature in a precise range of 225℃-235℃, which reflects a high degree of process control. This narrow range of temperature control requirements is more stringent than the traditional wide temperature range, requiring the use of more advanced temperature control equipment and monitoring systems. Such precise temperature control ensures that all processed parts receive consistent heat treatment, improving product consistency and reliability. This high-temperature treatment method may also bring some additional advantages.

[0049] This high temperature treatment method places higher demands on equipment and material selection. The oven must be able to reach and maintain this high temperature safely and stably, and all sealing materials and accessories must be able to withstand this high temperature without performance degradation. This high standard not only improves product quality, but also promotes the technological upgrade of the entire production line.

[0050] After setting the corresponding spraying parameters according to the specifications of the induction coil, put the induction coil into the drying room, heat the drying room to 180 degrees, take out the induction coil and turn it over, spray it for the second time after turning it over, and remove the sealant after spraying is completed.

[0051] The process of multi-step spraying is adopted, which is fundamentally different from the traditional single spraying method. By baking after the first spraying, and then turning over and spraying again, this method can ensure that every surface of the induction coil is fully and evenly sprayed. This multi-spraying method significantly improves the quality and uniformity of the insulation layer, and solves the problem of dead corners or uneven coverage that may exist in traditional single spraying.

[0052] The baking process between the two spraying steps, with the temperature precisely controlled at 180 degrees, reflects the fine control of the process. This intermediate baking not only cures the first spraying layer, but also provides a better foundation for the second spraying, improving the adhesion and durability of the overall insulation layer. The baking temperature of 180 degrees is carefully selected to ensure sufficient curing without causing thermal damage to other parts of the induction coil. Turning over is another innovation. This operation ensures that all surfaces of the induction coil can be sprayed evenly, solving the problem of the bottom or hidden surface that is difficult to handle in traditional methods. This all-round spraying greatly improves the consistency and reliability of insulation performance. The practice of removing the sealant after all spraying steps are completed is also an important innovation. This method ensures that the parts that need to be protected (such as threads or connections) are not contaminated by the spraying material during the entire spraying process.

[0053] Retaining the sealant until the last step also provides additional protection for the entire process, reducing possible contamination or damage. This complex, multi-step processing method reflects the high attention paid to product quality. Although it may increase production time and complexity, it can significantly improve product quality and reliability. This method requires more precise equipment control and stricter process parameter management, driving the entire production line to a higher level of automation and precision control. This method also reflects the consideration of energy efficiency and material utilization. By precisely controlling each step, material waste and energy consumption can be minimized while achieving the best spraying results.

[0054] After placing the prepared coil at the center of the stage, the insulating powder spraying device controls the position of the middle insulating powder spraying gun of the insulating spraying device, so that the middle insulating powder spraying gun and the inner surface of the induction coil are within the set standard range. The practice of accurately placing the induction coil at the center of the stage reflects a high degree of accuracy and standardization. Traditional methods may rely on the operator's experience and visual inspection, while this center positioning ensures that each coil can receive a consistent spraying treatment, greatly improving the consistency and quality of the product.

[0055] The design of controlling the position of the central insulation powder spray gun is an important innovation. This practice pays special attention to the spraying of the inner surface of the induction coil, which is often overlooked or difficult to accurately control with traditional spraying methods. Uniform spraying of the inner surface is critical to the insulation performance of the coil, and this precise control can significantly improve the overall performance and reliability of the product. The practice of keeping the central insulation powder spray gun within the set standard range with the inner surface of the induction coil further reflects a high degree of precise control. This precise positioning not only ensures uniform spraying, but also optimizes spraying efficiency and reduces material waste.

[0056] The practice of setting standard intervals indicates that this is a repeatable, controllable and precise process, rather than a rough estimate that relies on the operator's subjective judgment. This high-precision position control may require the use of advanced sensors and control systems, such as laser ranging or machine vision systems, to ensure that the spray gun is always in the optimal position. This not only improves the spraying quality, but also increases the degree of automation of the entire process. This design also reflects the adaptability to induction coils of different sizes and shapes. With adjustable spray gun position control, the system can easily adapt to coils of different specifications, increasing the flexibility and versatility of the production line. This precise control may also bring other advantages, such as reduced overspray and increased recycling rates, thereby reducing production costs and environmental impact.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A spraying method for a metal insulation automated production line, characterized in that: The method comprises the following steps: Before the induction coil is introduced into the production line, the water pressure test is carried out on the induction coil, the sealing and surface of the induction coil are preliminarily tested, and the welding interface of the induction coil is tested simultaneously; after the water pressure test is completed, the dirty, burred and weld slag parts on the surface of the induction coil are processed and polished, and the impurities and dust attached to the induction coil are cleaned, and the weld slag and burr parts after processing are rechecked; Adjust the turn spacing of the induction coil and calibrate the turn-to-turn size of the induction coil. After the calibration is completed, seal the induction coil and the workpiece water nozzle and pipe mouth bolts and put them into the drying room; Heat the induction coil and keep it warm. Take it out and check the status of the nozzle seal. If it is detached or damaged, replace it in time. Check that there is no abnormality in the seal of the induction coil and then put it into the insulation powder spraying room. Turn on the automatic insulation powder spraying equipment to spray all parts of the surface of the induction coil. When performing insulation spraying, place the prepared induction coil at the center of the stage: adjust the front and rear positions of the external spray gun, start a low-speed test run after the preparation is completed, set the middle spray gun and the external spray gun at the start and end positions of the up and down movement, turn on the rotating stage to confirm that the spray device operation has no interference with the induction coil, and then start the spray device normally, so that the end face of the induction coil in the circumferential direction is sprayed with insulation powder, and set the corresponding spray parameters according to the specifications of the induction coil; The induction coil sprayed with insulating powder is placed in a drying room and baked at 170°C for 15 minutes. The insulation of the induction coil after fluidized curing is tested with an electric spark leak detector.

2. A spraying method for a metal insulation automated production line according to claim 1, characterized in that: When calibrating the inter-turn dimensions of the induction coil, the calibration error is controlled within 0.5 mm, and the surface flatness is controlled within 0.5 mm.

3. A spraying method for a metal insulation automated production line according to claim 1, characterized in that: After the induction coil, the workpiece water nozzle and the pipe mouth bolts are sealed and placed in the drying room, the drying room temperature is increased to 230°C and maintained for at least one hour so that the drying room temperature is controlled between 225°C and 235°C.

4. A spraying method for a metal insulation automated production line according to claim 1, characterized in that: After setting the corresponding spraying parameters according to the specifications of the induction coil, put the induction coil into the drying room, heat the drying room to 180 degrees, take out the induction coil and turn it over, spray it for the second time after turning it over, and remove the sealant after spraying is completed.

5. A spraying method for a metal insulation automated production line according to claim 1, characterized in that: After placing the prepared coil at the center of the stage, the insulating powder spraying device controls the position of the middle insulating powder spraying gun of the insulating powder spraying device so that the middle insulating powder spraying gun and the inner surface of the induction coil are within a set standard range.

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