Electromagnetic wire paint film thickness online detection method and device

Abstract

The invention belongs to the technical field of paint film thickness online detection, and particularly relates to an electromagnetic wire paint film thickness online detection method and device. Starting the transmission device; obtaining an infrared image shot by the infrared camera, and obtaining surface temperature information of the electromagnetic wire from the infrared image; paint film thickness information is obtained according to the surface temperature information; the paint film points with the paint film thickness lower than a first thickness threshold value in the paint film thickness information are subjected to skin breaking detection, and paint film skin breaking information is obtained. According to the method, the metal material in the electromagnetic wire is heated through the induction coil, the paint film cannot be heated by eddy current and the paint film and the metal have huge thermal conductivity difference, so that the paint film thickness can influence the surface temperature of the paint film, and the problem that the actual thickness value of the paint film cannot be obtained online in the prior art can be solved. And the problem that the accuracy of judging the thickness of the paint film of the electromagnetic wire is reduced due to the influence of huge inductance in the prior art is solved.

Description

Technical Field

[0001] The present application belongs to the technical field of online detection of paint film thickness, and in particular to a method and device for online detection of electromagnetic wire paint film thickness. Background Art

[0002] Electromagnetic wire is a general term for various conductive wires, such as enameled copper wire. Whether the paint film thickness of the electromagnetic wire is uniform and qualified is crucial to the quality of the electromagnetic wire, which can affect the electromagnetic wire's anti-interference, corrosion resistance, high temperature resistance, aging resistance and other properties.

[0003] Existing online detection methods for the thickness of electromagnetic wire paint films often infer the thickness of the electromagnetic wire paint film by detecting the resistance of the thick wall of the paint film. After connecting a fixed voltage to the enameled wire, the current size of the path is detected, and the thickness of the paint film is inferred based on the path current size. However, this method cannot obtain the actual thickness value of the paint film. In actual practice, the electromagnetic wire is a whole long wire. During the paint film thickness detection process, both ends of the electromagnetic wire are wound into a large turn coil to save space, which will cause a huge inductance effect. Therefore, the path current of this method in actual application will inevitably be affected by the huge inductance, resulting in a time delay of the path current, which reduces the accuracy of the judgment of the paint film thickness of the electromagnetic wire. Summary of the Invention

[0004] The embodiments of the present application provide a method and device for online detection of the paint film thickness of electromagnetic wires, which can solve the problem that the existing technology cannot obtain the actual thickness value of the paint film online, and the existing technology is affected by huge inductance, which reduces the accuracy of judging the paint film thickness of the electromagnetic wire.

[0005] In a first aspect, an embodiment of the present application provides an online detection method for the thickness of an electromagnetic wire paint film, the method being applied to an online detection device for the thickness of an electromagnetic wire paint film, the method comprising: Starting a heat preservation device; wherein the heat preservation device is used to keep the electromagnetic wire at a constant temperature to a first temperature; Starting a transmission device; wherein the transmission device transmits the electromagnetic wire through the induction coil at a first rate, and the electromagnetic wire is heated to a second temperature after passing through the induction coil; Acquire an infrared image captured by an infrared camera, and obtain surface temperature information of the electromagnetic wire from the infrared image; wherein the infrared camera is a linear array camera surrounding the electromagnetic wire, and the infrared image is a full-view surface image of the electromagnetic wire; Obtaining paint film thickness information according to the surface temperature information; wherein the paint film thickness information includes the paint film thickness value of the paint film at each position of the electromagnetic wire; A paint film breakage detection is performed on the paint film points in the paint film thickness information where the paint film thickness is lower than the first thickness threshold to obtain paint film breakage information; wherein, the paint film breakage detection is used to determine whether the paint film at the paint film point is broken, and the paint film breakage information is used to record the position of the paint film point on the electromagnetic wire where the paint film is broken.

[0006] The above technical solutions in the embodiments of the present application have at least the following technical effects: In the online detection method for the paint film thickness of electromagnetic wire provided in this application, the electromagnetic wire is first heated to a first temperature. This step, maintaining the electromagnetic wire at a fixed temperature, improves the accuracy of the subsequent process of determining the paint film thickness. Secondly, the electromagnetic wire is transmitted through an induction coil at a first rate. In this step, the electromagnetic wire is fed to the induction coil at the first rate, and the induction coil heats the electromagnetic wire to a second temperature, which facilitates the subsequent step of determining the paint film thickness from the temperature. Subsequently, an infrared image is captured by an infrared camera, and surface temperature information of the electromagnetic wire is obtained from the infrared image. In this step, the surface temperature of the electromagnetic wire is quickly acquired online using the infrared camera, which facilitates online detection of the paint film thickness of the electromagnetic wire. Subsequently, paint film thickness information is obtained based on the surface temperature information. In this step, because the paint film cannot be heated by eddy currents and the significant difference in thermal conductivity between the paint film and the metal is significant, the paint film thickness significantly affects the surface temperature of the electromagnetic wire. This method solves the problem of the existing technology in being unable to determine the actual paint film thickness online, as well as the problem of the existing technology being affected by the significant inductance, which reduces the accuracy of the paint film thickness determination of the electromagnetic wire. Finally, a paint film breakage detection is performed on the paint film points in the paint film thickness information where the paint film thickness is lower than the first thickness threshold to obtain paint film breakage information. In this step, the paint film breakage detection is used to detect whether there are any breakage points on the electromagnetic wire, thereby improving the practicality of the method. In this method, the metal material in the electromagnetic wire is evenly heated by means of an induction coil at a constant temperature and a fixed rate, but the paint film is not heated. Because the paint film cannot be heated by eddy currents and there is a huge difference in thermal conductivity between the paint film and the metal, the thickness of the paint film is estimated based on the surface temperature of the paint film. Finally, a paint film breakage detection step is added to optimize the shortcomings of the temperature estimation thickness method, which is insensitive to paint film breakage. This can effectively solve the problem that the existing technology cannot obtain the actual thickness value of the paint film online, and the existing technology is affected by the huge inductance, which reduces the accuracy of the judgment of the paint film thickness of the electromagnetic wire.

[0007] In a second aspect, an embodiment of the present application provides an online detection device for electromagnetic wire paint film thickness, which is used to implement the online detection method for electromagnetic wire paint film thickness described in any one of the first aspects above, including: Loading platform; A heat preservation device is provided on the supporting platform, and is used to keep the electromagnetic wire at a constant temperature of the first temperature; a transmission device, disposed on the carrying platform, and configured to transmit the electromagnetic wire at a first rate; an induction coil, disposed on the supporting platform, wherein the electromagnetic wire passes through the center of the induction coil, and the induction coil is used to heat the electromagnetic wire; an infrared camera, disposed on the supporting platform, surrounding the electromagnetic wire, and used for capturing an infrared image of the electromagnetic wire; A first detection pulley is provided on the supporting platform, wherein the first detection pulley is in close contact with the electromagnetic wire, and the contact portion is made of conductive material; The second detection pulley is disposed on the supporting platform, has the same specifications as the first detection pulley, and is symmetrical with the first detection pulley about the electromagnetic wire axis.

[0008] In a third aspect, an embodiment of the present application provides an online detection device for the thickness of an electromagnetic wire paint film, comprising a memory, a processor, and a computer program stored in the memory and runnable on the processor, characterized in that the processor implements the method described in any one of the first aspects above when executing the computer program.

[0009] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the method described in any one of the first aspects above.

[0010] In a fifth aspect, an embodiment of the present application provides a computer program product. When the computer program product is run on an online detection device for electromagnetic wire paint film thickness, the online detection device for electromagnetic wire paint film thickness enables the online detection method for electromagnetic wire paint film thickness described in any one of the above-mentioned first aspects.

[0011] It can be understood that the beneficial effects of the second to fifth aspects mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0013] Figure 1 1 is a flow chart of an online detection method for the paint film thickness of electromagnetic wires provided in one embodiment of the present application; Figure 2This is a schematic structural diagram of a voltage detection circuit in step S530 of the online detection method for the paint film thickness of electromagnetic wires provided in one embodiment of the present application; Figure 3 This is a front view structural diagram of an online detection device for electromagnetic wire paint film thickness provided by one embodiment of the present application; Figure 4 It is a structural schematic diagram of the electromagnetic wire paint film thickness online detection equipment provided in an embodiment of the present application.

[0014] in, Figure 3 Reference numerals in the drawings: 11. Carrying platform; 111. Insulation device; 112. Transmission device; 12. Electromagnetic wire; 13. Induction coil; 14. Infrared camera; 15. First detection pulley; 16. Second detection pulley; 21. First camera; 22. Second camera. DETAILED DESCRIPTION

[0015] In the following description, specific details such as specific system structures and techniques are provided for purposes of illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obscuring the description of the present application with unnecessary detail.

[0016] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections thereof.

[0017] It will also be understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0018] As used in this specification and the appended claims, the term "if" can be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0019] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0020] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0021] In the related art, the existing online detection method of the paint film thickness of the electromagnetic wire often infers the paint film thickness of the electromagnetic wire by detecting the resistance of the thick wall of the paint film. After connecting a fixed voltage to the enameled wire, the current size of the path is detected, and the thickness of the paint film is inferred based on the path current size. However, this method has no way to obtain the actual thickness value of the paint film, and in actual conditions, the electromagnetic wire is a whole long wire. During the paint film thickness detection process, both ends of the electromagnetic wire are wound into a large turn coil to save space, which will cause a huge inductance effect. Therefore, the path current of this method in actual application will inevitably be affected by the huge inductance, resulting in a time delay of the path current, which reduces the accuracy of the judgment of the paint film thickness of the electromagnetic wire.

[0022] To address the aforementioned issues, embodiments of the present application provide a method for online detection of paint film thickness on electromagnetic wire. In this method, the electromagnetic wire is first heated to a first temperature. This step maintains the fixed temperature, facilitating the accuracy of subsequent determination of the paint film thickness. Next, the electromagnetic wire is transmitted through an induction coil at a first rate. In this step, the electromagnetic wire is fed to the induction coil at the first rate, where it is heated to a second temperature, facilitating the subsequent determination of the paint film thickness from the temperature. Subsequently, an infrared image is captured by an infrared camera, and surface temperature information of the electromagnetic wire is obtained from the infrared image. This step allows for rapid online detection of the electromagnetic wire's paint film thickness using the infrared camera, facilitating online detection of the electromagnetic wire's paint film thickness. Subsequently, paint film thickness information is obtained based on the surface temperature information. In this step, paint film thickness information is obtained based on the surface temperature information. Because the paint film cannot be heated by eddy currents and because of the significant thermal conductivity difference between the paint film and the metal, the paint film thickness significantly affects the surface temperature of the electromagnetic wire. This method addresses the existing issues of the inability to determine the actual paint film thickness online, as well as the issue of the significant inductance influence that reduces the accuracy of determining the paint film thickness of the electromagnetic wire. Finally, a paint film breakage detection is performed on the paint film points in the paint film thickness information where the paint film thickness is lower than the first thickness threshold to obtain paint film breakage information. In this step, the paint film breakage detection is used to detect whether there are any breakage points on the electromagnetic wire, thereby improving the practicality of the method. In this method, the metal material in the electromagnetic wire is evenly heated by means of an induction coil at a constant temperature and a fixed rate, but the paint film is not heated. Because the paint film cannot be heated by eddy currents and there is a huge difference in thermal conductivity between the paint film and the metal, the thickness of the paint film is estimated based on the surface temperature of the paint film. Finally, a paint film breakage detection step is added to optimize the shortcomings of the temperature estimation thickness method, which is insensitive to paint film breakage. This can effectively solve the problem that the existing technology cannot obtain the actual thickness value of the paint film online, and the existing technology is affected by the huge inductance, which reduces the accuracy of the judgment of the paint film thickness of the electromagnetic wire.

[0023] The online detection method for the paint film thickness of electromagnetic wire provided in the embodiment of the present application can be applied to the online detection equipment for the paint film thickness of electromagnetic wire. At this time, the online detection equipment for the paint film thickness of electromagnetic wire is the executor of the online detection method for the paint film thickness of electromagnetic wire provided in the embodiment of the present application. The embodiment of the present application does not impose any restrictions on the specific type of the online detection equipment for the paint film thickness of electromagnetic wire.

[0024] For example, an online detection device for the thickness of an electromagnetic wire paint film may include a heat preservation device, a transmission device, a heating device, an infrared camera, a skin breakage detection device, and a control device. The heat preservation device may be an air conditioner, the transmission device may be a motor and a transmission wheel, the heating device may be an induction coil, the infrared camera may be a linear array infrared CCD camera, and the skin breakage detection device may be a conductor pulley containing a voltage detection circuit. The control device may control the heat preservation temperature of the heat preservation device, the transmission speed of the transmission device, the heating power of the heating device, and may also obtain an infrared image captured by the infrared camera, obtain the surface temperature of the electromagnetic wire through the infrared image, and control the skin breakage detection device to detect the electromagnetic wire for skin breakage.

[0025] The control device can be a single chip microcomputer, a mobile phone, a tablet computer, a notebook computer, a netbook, a desktop computer, a computer, a laptop computer, etc.

[0026] In order to better understand the online detection method for the paint film thickness of the electromagnetic wire provided in the embodiment of the present application, the specific implementation process of the online detection method for the paint film thickness of the electromagnetic wire provided in the embodiment of the present application is exemplarily introduced below.

[0027] Figure 1 The schematic flow chart of the online detection method for the paint film thickness of electromagnetic wire provided in an embodiment of the present application is shown. The online detection method for the paint film thickness of electromagnetic wire includes: S100: Start a heat preservation device, wherein the heat preservation device is used to keep the electromagnetic wire at a first temperature.

[0028] It is understood that the electromagnetic wire can be placed in a constant temperature environment and maintained for 10 to 20 minutes. The constant temperature environment can be maintained by air conditioning. The first temperature can be 0°C, or other temperatures below 20°C.

[0029] Such a setting can ensure that the temperature of the electromagnetic wire has a uniform and stable starting point, which is beneficial for the subsequent step of obtaining the paint film thickness through temperature.

[0030] S200: Start the transmission device, wherein the transmission device transmits the electromagnetic wire through the induction coil at a first rate, and the electromagnetic wire is heated to a second temperature after passing through the induction coil.

[0031] It can be understood that the electromagnetic wire can be transmitted through the motor and the pulley. The motor and the pulley pass the electromagnetic wire through the center of the induction coil at a stable first rate. The induction coil is connected to an alternating current of a fixed frequency, and the electromagnetic wire can be heated with a stable heating power. After passing through the induction coil, the electromagnetic wire is heated to a second temperature. The second temperature is a temperature greater than room temperature, such as 60°C, etc.

[0032] It should be noted that the temperature after heating is affected by the first rate, wire diameter, wire material and heating power. Before performing online paint film detection, a heating test can be performed on bare wires of the same specification and the bare wire temperature can be detected. Then, the first rate and heating power can be adjusted so that the bare wire temperature after heating is the second temperature.

[0033] Such an arrangement enables the electromagnetic wire to be heated at a fixed point and quickly, which is beneficial for the subsequent step of obtaining the paint film thickness through temperature.

[0034] S300: Acquire an infrared image captured by an infrared camera, and obtain surface temperature information of the electromagnetic wire from the infrared image. The infrared camera is a linear array camera that surrounds the electromagnetic wire, and the infrared image is a full-view surface image of the electromagnetic wire.

[0035] It can be understood that if the electromagnetic wire moves at a first rate, a fixed linear array infrared CCD camera can capture an infrared image of the entire electromagnetic wire (of course, the linear array camera's capture frequency must be sufficiently high, at least greater than F1, where F1 = first rate / linear array camera capture width). However, the capture range of a linear array infrared CCD camera is a single line. Therefore, multiple linear array infrared CCD cameras (at least three, with an angle difference of 120°) can be arranged around the electromagnetic wire to capture infrared images of the electromagnetic wire without blind spots. In this case, the capture area encircles the electromagnetic wire, similar to its circumference. The infrared images from multiple linear array infrared CCD cameras are stitched together to obtain an infrared image of the entire electromagnetic wire. The capture area is set behind the heating zone of the electromagnetic wire. The essence of infrared imaging is to replace grayscale values ​​with temperature. Therefore, the surface temperature information of the electromagnetic wire can be directly obtained from the infrared image of the entire electromagnetic wire. This surface temperature information includes the surface temperature of all paint film points on the electromagnetic wire. The surface temperature of any paint film point can be obtained from the surface temperature information in the form of (F (position) = temperature).

[0036] With this arrangement, the surface temperature information of the entire magnet wire can be obtained.

[0037] S400: Obtain paint film thickness information based on the surface temperature information, wherein the paint film thickness information includes the paint film thickness value of the paint film at each position of the electromagnetic wire.

[0038] It can be understood that the heat conduction equation can be used to solve the three-dimensional distribution diagram of the paint film's surface temperature-time-paint film thickness, and then the surface temperature and time can be substituted into the paint film thickness information. An empirical formula can also be established through experiments. For example, a sample electromagnetic wire with a paint film thickness that increases linearly from 0 is passed through a thickness test, and then the surface temperature-paint film thickness curve of the sample electromagnetic wire can be obtained. The curve function is the empirical formula.

[0039] With this setup, when the induction coil heats the magnet wire, only the conductor of the magnet wire is heated by the eddy currents. Therefore, if the heating time is short enough, the time it takes for the heat to transfer to the paint film surface is directly proportional to the film thickness. In other words, the paint film surface temperature at the same moment is directly proportional to the film thickness. Therefore, the paint film thickness can be determined from the paint film surface temperature.

[0040] In one possible implementation, in step S400, obtaining paint film thickness information according to surface temperature information includes: S410: Acquire heat conduction time and thermal diffusion coefficient of the paint film. The heat conduction time refers to the time difference between the electromagnetic wire passing through the induction coil and the infrared image being captured.

[0041] It can be understood that the time difference t between the time point of infrared image capture and the time point of heating completion is the heat conduction time. Then test or query the thermal diffusion coefficient of the paint film. The thermal diffusion coefficient α=λ / (ρc), λ refers to the thermal conductivity of the material, ρ refers to the density of the material, and c refers to the specific heat capacity of the material.

[0042] This setting is conducive to calculating the paint film thickness.

[0043] S420: Obtaining paint film thickness information based on the surface temperature information, the heat conduction time, and the thermal diffusion coefficient of the paint film.

[0044] It can be understood that the paint film thickness of electromagnetic wire is generally not greater than 1 / 10 of the conductor diameter, so the heat conduction equation can be simplified to a one-dimensional heat conduction equation. Therefore, the relationship between the temperature in the paint film and time and space satisfies the one-dimensional heat conduction equation. In this method, the initial condition is: u(x, 0) = T1 (the temperature inside the paint film is the first temperature T1), and the boundary condition is: u(0, t) = T2 (there is a heat source with a temperature of the second temperature T2 at the boundary x = 0, which is a conductor). In summary, the entire heat conduction physical process satisfies the following set of equations: , the explicit format of the finite difference method can be used to solve this set of partial differential equations, which can be solved through MATLAB. After obtaining the solution of u(x, t), the heat conduction time t is substituted into u(x, t) to obtain the temperature thickness function g(x). The temperature thickness function g(x) is a binary function of the surface temperature with respect to the paint film thickness. g(x) is equal to the paint film surface temperature, and x is equal to the paint film thickness. Based on this, the paint film thickness information is obtained.

[0045] With this setting, the paint film thickness information can be obtained theoretically.

[0046] S500: Perform a paint film breakage detection on a paint film point in the paint film thickness information where the paint film thickness is lower than a first thickness threshold, to obtain paint film breakage information. The paint film breakage detection is used to determine whether the paint film at the paint film point is broken, and the paint film breakage information is used to record the location of the paint film breakage point on the electromagnetic wire.

[0047] It is understandable that the paint film can be verified as broken at points where the paint film thickness is below a first thickness threshold in the paint film thickness information by placing a probe on the surface of the electromagnetic wire and detecting the voltage, such as the method in patent application number CN201410619760.0. However, this method does not take into account the location of the broken point. This method can use a multi-phase probe (i.e., the probe is divided into multiple phases, each phase can independently detect the surface voltage of the electromagnetic wire within a certain range, such as a four-phase probe, each phase can detect the surface voltage of the electromagnetic wire within a 90° range, and the four-phase probe can be four mutually insulated conductor pulleys) to roughly determine the location of the broken point, and combine it with the paint film points in the paint film thickness information where the paint film thickness is below a first thickness threshold to accurately determine the location of the broken point. The first thickness threshold can be 10 microns.

[0048] Exemplarily, the detection head is a four-phase detection head. At a certain moment, the detection head detects a broken skin point in the first phase of the electromagnetic wire. Then, in the first phase of the corresponding position in the paint film thickness information, the paint film point with a paint film thickness lower than the first thickness threshold is retrieved, and the broken skin point is determined to be the paint film point with a paint film thickness lower than the first thickness threshold.

[0049] While inferring thickness from temperature is theoretically feasible and accurate with this setup, in practice the heating time of the electromagnetic wire cannot be zero. Therefore, heat has already been conducted into the paint film by the time the electromagnetic wire is heated. While this error can be mitigated by reducing the heating time, the film thickness obtained by this method is still distorted and inaccurate for paint film points with low film thickness. Furthermore, whether the electromagnetic wire's paint film is broken is an important indicator of its quality. Therefore, this method uses a multiphase probe to perform voltage detection to determine whether paint film points with low film thickness are broken, thus optimizing for this shortcoming. This improves the practicality of this method, and locating the broken film points provides technical support for online paint film repair.

[0050] In a possible implementation, in step S500, performing a paint film breakage detection on a paint film point in the paint film thickness information where the paint film thickness is lower than a first thickness threshold includes: S510: Control a first power source to be turned on. The first power source is used to maintain a constant voltage on the electromagnetic wire.

[0051] It can be understood that the first power supply is connected to both ends of the electromagnetic wire. After the first power supply is turned on, the voltage on the electromagnetic wire is always a fixed voltage and no current is generated. The fixed voltage can be 12V or 5V, or other voltages.

[0052] Such a setting is conducive to the subsequent detection of paint film breakage points.

[0053] S520: Obtain coordinate information of paint film points whose paint film thickness is lower than a first thickness threshold in the paint film thickness information. The coordinate information records the positions of all paint film points whose paint film thickness is lower than the first thickness threshold.

[0054] It can be understood that the coordinate information of the paint film point can be expressed in the form of (r, θ), where r represents the length of the distance from the starting point of the electromagnetic wire to the paint film point, and θ represents the angle at which the paint film point is located on the electromagnetic wire. This allows the electromagnetic wire to not rotate during transmission, with the transmission direction of the electromagnetic wire as the front, the right side of the electromagnetic wire as the 0° direction, and the counterclockwise or clockwise direction as the positive angle direction.

[0055] Such an arrangement can accurately and uniquely represent and determine the coordinate information of the paint film point.

[0056] S530: Perform voltage detection on all paint film points whose paint film thickness is lower than a first thickness threshold according to the coordinate information. The detection head of the electromagnetic wire paint film thickness online detection device outputs a voltage value after performing voltage detection.

[0057] It can be understood that the coordinate information records the positions of all paint film points whose paint film thickness is lower than the first thickness threshold. The detection head performs voltage detection only when a paint film point whose paint film thickness is lower than the first thickness threshold arrives. No voltage detection is performed at other times. Figure 2 The voltage detection circuit shown, Figure 2 The equivalent inductance 1 and equivalent inductance 2 in the figure are drawn as two equivalent inductors because both ends of the electromagnetic wire are wound into a large coil in actual production to save space, resulting in a huge inductance effect. The electromagnetic wire voltage measured by the detection head is connected to the base of the transistor amplifier circuit, and the emitter of the transistor amplifier circuit is grounded. Figure 2 The detection data of the medium voltmeter is the output voltage of the detection head. The transistor amplifier circuit can amplify the base current. Therefore, when the paint film is broken, the output voltage of the detection head is the maximum voltage (i.e., the collector voltage), and when it is not broken, the output voltage is the minimum voltage (almost 0V). It does not consider the thickness of the paint film, but only considers whether the paint film is broken, which can minimize the influence of the equivalent inductance.

[0058] This setting is to solve the disadvantage of this method that it is impossible to determine whether the paint film is broken for paint film points with low paint film thickness.

[0059] S540: If the output voltage of the detection head is greater than the first voltage threshold, the paint film at the corresponding paint film point has been broken; otherwise, the paint film at the corresponding paint film point has not been broken.

[0060] It can be understood that the first voltage threshold is slightly lower than the collector voltage of the transistor amplifier circuit. When the paint film breaks, the base voltage is equal to the voltage of the first power supply, which is greater than the transistor conduction voltage. Therefore, the transistor conducts, and the output voltage can then be detected at the emitter. When the paint film is intact, the output voltage is almost 0V. When the paint film breaks, the voltage is equal to the voltage of the transistor collector, which is equivalent to 0 and 1 in binary. Only whether the paint film is broken is considered, not the thickness of the paint film. This solves the problem that existing methods are affected by the huge inductance, resulting in a time delay in the path current and reducing the accuracy of the determination of the paint film thickness of the electromagnetic wire.

[0061] This setting is to solve the disadvantage that this method cannot determine whether the paint film is broken for paint film points with low paint film thickness.

[0062] Optionally, the infrared image includes a first line array image and a second line array image; and the method further includes: S610: Obtain first surface temperature information based on the first line array image. The first line array image is captured by a first camera. The first camera has a fixed capturing area located behind a heating zone of the electromagnetic wire, and a distance between the capturing area of ​​the first camera and the heating zone is zero. The heating zone is the area where the induction coil heats the electromagnetic wire.

[0063] It can be understood that the shooting area of ​​the first camera is fixed, and the distance between the shooting area and the heating area of ​​the electromagnetic wire is zero, that is, the electromagnetic wire reaches the shooting area of ​​the first camera just after leaving the heating area, and the temperature information obtained in the first line array image is the first surface temperature information.

[0064] Such an arrangement is conducive to improving the practicability of the method.

[0065] S620: Obtain second surface temperature information based on the second line array image. The second line array image is captured by a second camera. The second camera's capturing area is movable and initially the same as the capturing area of ​​the first camera. After the electromagnetic wire paint film thickness online detection device is activated, the second camera moves synchronously with the electromagnetic wire at a first rate.

[0066] It can be understood that the shooting area of ​​the second camera is moving, and the starting point is the shooting area of ​​the first camera. The moving speed and direction are synchronized with the electromagnetic wire, that is, the shooting area of ​​the second camera is relatively stationary with the electromagnetic wire. When the thickness of the electromagnetic wire just begins to be detected, the shooting area of ​​the second camera moves synchronously with the electromagnetic wire, and the temperature information obtained in the second line array image is the second surface temperature information.

[0067] Such an arrangement is conducive to improving the practicability of the method.

[0068] S630: When the second surface temperature information indicates that the average surface temperature of the electromagnetic wire is greater than or equal to a third temperature, controlling the second camera to fix the shooting area, and obtaining third surface temperature information based on the line array image captured by the second camera after the shooting area is fixed. The third temperature is between the first temperature and the second temperature.

[0069] It is understood that the average surface temperature of the electromagnetic wire at the current moment in the second surface temperature information is constantly calculated. When the average surface temperature reaches a third temperature, the second camera's capture area stops moving, and the temperature information obtained from the fixed second line array image becomes the third surface temperature information. The third temperature can be the average of the first and second temperatures, or another temperature between the first and second temperatures.

[0070] With this setting, the paint film thickness of the first sample in the electromagnetic wire essentially represents the paint film thickness of the entire electromagnetic wire, and the third temperature point is the dividing line. This optional method is equivalent to adding a step to the original method: adding a linear array infrared camera shooting point at the third temperature point, and the third temperature point is obtained through the paint film thickness of the first sample, which improves the practicality of this method.

[0071] S640, perform temperature judgment on the surface temperature of each paint film point in the first surface temperature information. If the surface temperature of the paint film point is greater than the first temperature, obtain the paint film thickness according to the first surface temperature information; if the surface temperature of the paint film point is equal to the first temperature, obtain the paint film thickness according to the third surface temperature information.

[0072] It can be understood that the paint film points with temperatures greater than the first temperature in the first surface temperature information are points with thinner paint film thickness. These paint film points quickly heat up after the electromagnetic wire leaves the heating zone. Therefore, a first camera is set at a zero-distance position after the heating zone to capture the first line array image, and the paint film thickness of these thinner paint film points is calculated using the first surface temperature information. Paint film points with a surface temperature equal to the first temperature are points with thicker paint film thickness. Because the paint film thickness is thicker, these paint film points do not heat up in the first line array image. Therefore, the paint film thickness of these thicker paint film points cannot be calculated using the first surface temperature information. Therefore, a second camera with a moving shooting area is set. The shooting area of ​​the second camera stops after the average temperature of the paint film surface reaches a threshold (i.e., the surface temperature of the thicker paint film points has also risen to a temperature greater than the first temperature). The second camera obtains the third surface temperature information, and the paint film thickness of these thicker paint film points is calculated using the third surface temperature information. It should be noted that the heat conduction time t of the two surface temperature information is different.

[0073] In this way, the infrared image is captured by a linear array infrared camera. In the above methods, only one linear array infrared camera is used to capture one linear array image. However, in actual application, there may be a special situation: the paint film thickness fluctuates greatly, resulting in one linear array image being insufficient to represent the paint film thickness. Some paint film points in one linear array image have already reached the second temperature, but some paint film points are still at the first temperature. At this time, it is necessary to add a linear array image. This step proposes a solution using two linear array images, that is, the method of steps S610 to S640. Through a stationary linear array camera and a moving linear array camera, the number of linear array images is increased to improve the temperature generalization range of the linear array image, thereby preventing the above problem and improving the practicality of this method.

[0074] Optionally, the detection head is two or more pulleys, the pulleys are insulated from each other, and the contact parts between the pulleys and the electromagnetic wires are composed of conductive materials. The detection head is used to detect the cracking of the paint film.

[0075] It can be understood that the detection head is two or more pulleys, and the pulleys are insulated from each other. The contact part between the pulley and the electromagnetic wire is made of conductive material. Each pulley is independently connected to a voltage detection circuit to realize the function of the multi-phase detection head in step S500.

[0076] Such a setting expands the function of the method, can locate the position of the broken paint film point, and is conducive to providing technical support for online repair of paint film.

[0077] Optionally, pulleys of different specifications may be selected according to the diameters of electromagnetic wires.

[0078] It is understandable that the pulley needs to fit tightly to the paint film of the electromagnetic wire. Therefore, when performing online detection of the paint film thickness of electromagnetic wires of different diameters, pulleys of corresponding specifications should be selected.

[0079] Such setting improves the rationality of this method.

[0080] Optionally, a value of a length of a heating zone of the induction coil divided by the first rate is less than 0.1 seconds.

[0081] It can be understood that the length of the heating zone divided by the first rate equals the heating time. If the heating time is not short enough, it will directly affect the accuracy of the results of this method. Therefore, it is stipulated that the heating time shall not exceed 0.1s.

[0082] Such an arrangement improves the accuracy of the results obtained by this method.

[0083] Optionally, the second temperature is greater than 50°C and less than 100°C.

[0084] It can be understood that the second temperature is set to be greater than 50°C and less than 100°C. Due to the limitation of heating time, it is difficult for the second temperature to exceed 100°C, and too high a temperature may damage the paint film. Therefore, the upper limit of the second temperature is set to 100°C. Also, because this method calculates the paint film thickness by temperature, if the difference between the first temperature and the second temperature is too small, the accuracy of the calculated paint film thickness will be reduced. Therefore, the lower limit of the second temperature is set to 50°C.

[0085] Such setting can improve the accuracy of this method.

[0086] In order to better understand the online detection device for the paint film thickness of the electromagnetic wire provided in the embodiment of the present application, a diagram of the online detection device for the paint film thickness of the electromagnetic wire provided in the embodiment of the present application is introduced below.

[0087] See also Figure 3 The embodiment of the present application provides an online detection device for the thickness of an electromagnetic wire paint film, comprising a carrier 11, a heat preservation device 111, a transmission device 112, an electromagnetic wire 12, an induction coil 13, an infrared camera 14, a first detection pulley 15, and a second detection pulley 16, wherein: Carrying platform 11; A heat preservation device 111 is provided on the carrier platform 11 and is used to keep the electromagnetic wire 12 at a constant temperature of the first temperature; The transmission device 112 is disposed on the carrier 11 and is used to transmit the electromagnetic wire 12 at a first rate; The induction coil 13 is disposed on the carrier 11, and the electromagnetic wire 12 passes through the center of the induction coil 13. The induction coil 13 is used to heat the electromagnetic wire 12; an infrared camera 14 , disposed on the carrier 11 and surrounding the electromagnetic wire 12 , for capturing an infrared image of the electromagnetic wire 12 ; The first detection pulley 15 is disposed on the carrier 11. The first detection pulley 15 is tightly fitted with the electromagnetic wire 12, and the fitting portion is made of conductive material. The second detection pulley 16 is disposed on the supporting platform 11 , has the same specifications as the first detection pulley 15 , and is symmetrical to the first detection pulley 15 about the axis of the electromagnetic wire 12 .

[0088] Among them, the supporting platform 11 is used to carry other components, and also has an insulation device 111 and a transmission device 112. The insulation device 111 can keep the electromagnetic wire 12 at a first temperature, and the transmission device 112 can transmit the electromagnetic wire 12 at a first rate. The moving electromagnetic wire 12 first passes through the induction coil 13. Alternating current is passed through the induction coil 13, which can generate induced eddy currents in the electromagnetic wire 12 to heat the electromagnetic wire 12. Then the electromagnetic wire 12 passes through the middle of the infrared camera 14. The infrared camera 14 is annular and can capture infrared images of the electromagnetic wire 12 without blind spots. Finally, the electromagnetic wire 12 passes through the first detection pulley 15 and the second detection pulley 16. The first detection pulley 15 and the second detection pulley 16 can tightly clamp the electromagnetic wire 12, and detect whether there are any broken paint film points on the electromagnetic wire 12, and obtain the coordinate information of the broken paint film points.

[0089] It can be understood that the support platform 11 can be a base with a transmission pulley, 111 can be an air conditioner, 112 can be a transmission pulley, and the electromagnetic wire 12 is put on the transmission pulley and can be transmitted at a first rate. During the transmission process, it undergoes heating by the induction coil 13, taking pictures by the infrared camera 14, and detecting the broken paint film points by the first detection pulley 15 and the second detection pulley 16. The induction coil 13 can be various conductor coils, and the infrared camera 14 can be multiple linear array infrared CCD cameras. The multiple linear array infrared CCD cameras are distributed at a certain angle to capture infrared images of the electromagnetic wire 12 without dead angles. The first detection pulley 15 and the second detection pulley 16 can be metal pulleys coated with paint film. The contact part with the electromagnetic wire 12 is a conductor, and the other parts are coated with paint film.

[0090] With this setting, the thickness of the paint film can be calculated by the surface temperature of the paint film, solving the problem that the existing technology cannot obtain the actual thickness value of the paint film online, and the existing technology is affected by huge inductance, which reduces the accuracy of judging the thickness of the paint film of the electromagnetic wire.

[0091] In some embodiments, see Figure 3 , the infrared camera 14 also includes: A first camera 21 is provided on the carrier 11 and is used to capture a first line array image; The second camera 22 is disposed on the supporting platform 11 . The second camera 22 can adjust a shooting angle and is used to shoot a second line array image.

[0092] Among them, the shooting area of ​​the first camera 21 is fixed, the shooting area is located behind the induction coil 13, and the distance from the heating area of ​​the induction coil 13 is zero. The shooting area of ​​the second camera 22 is mobile. When the paint film thickness detection is just beginning, the shooting area is located at the starting point, and the starting point is the shooting area of ​​the first camera 21. As the paint film thickness detection is carried out, the shooting area of ​​the second camera 22 moves synchronously with the electromagnetic wire 12 at a first rate, and stops moving after the judgment condition is met.

[0093] It can be understood that the first camera 21 can be any linear array infrared CCD camera with a fixed shooting area for shooting the first linear array image, and the second camera 22 is a linear array infrared CCD camera with an adjustable shooting angle, with a movable shooting area for shooting the second linear array image.

[0094] This configuration prevents situations where a single line scan image is insufficient to represent paint film thickness due to significant fluctuations in paint film thickness. This occurs when some paint film points in a line scan image have already reached the second temperature, while others remain at the first temperature. This method utilizes both a stationary line scan camera and a moving line scan camera to increase the number of line scan images and broaden the temperature coverage range of the line scan images, preventing this problem and improving the practicality of the method.

[0095] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0096] The present application also provides an online detection device for the thickness of electromagnetic wire paint film. Figure 4 This is a schematic diagram of the structure of an online detection device for the thickness of electromagnetic wire paint film provided in one embodiment of the present application. Figure 4 As shown, the control device 5 of the electromagnetic wire paint film thickness online detection device of this embodiment includes: at least one processor 50 ( Figure 4 Only one is shown), at least one memory 51 ( Figure 4 Only one is shown in the figure) and a computer program 52 stored in the at least one memory 51 and executable on the at least one processor 50. When the processor 50 executes the computer program 52, the control device 5 of the electromagnetic wire paint film thickness online detection device implements the steps of any of the above-mentioned electromagnetic wire paint film thickness online detection method embodiments, or the control device 5 of the electromagnetic wire paint film thickness online detection device implements the functions of each unit in the above-mentioned device embodiments.

[0097] For example, the computer program 52 can be divided into one or more units, which are stored in the memory 51 and executed by the processor 50 to complete the present application. The one or more units can be a series of computer program instruction segments capable of performing specific functions, and the instruction segments are used to describe the execution process of the computer program 52 in the control device 5 of the electromagnetic wire paint film thickness online detection device.

[0098] The control device 5 of the electromagnetic wire paint film thickness online detection device can be a single chip microcomputer, a microprocessor, a mobile phone, a tablet computer, a wearable device, a vehicle-mounted device, a laptop computer, an ultra-mobile personal computer (UMPC), a netbook, a personal digital assistant (PDA), a desktop computer, a smart screen, a smart TV, or a handheld device with a wireless communication function. The control device 5 of the electromagnetic wire paint film thickness online detection device can include, but is not limited to, a processor 50 and a memory 51. Those skilled in the art will understand that Figure 4 It is only an example of the control device 5 of the electromagnetic wire paint film thickness online detection device, and does not constitute a limitation on the control device 5 of the electromagnetic wire paint film thickness online detection device. It can include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, it can also include input and output devices, network access devices, buses, etc.

[0099] The processor 50 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. A general-purpose processor may be a microprocessor or any conventional processor.

[0100] In some embodiments, the memory 51 may be an internal storage unit of the control device 5 of the online electromagnetic wire paint film thickness detection device, such as a hard drive or memory within the control device 5. In other embodiments, the memory 51 may be an external storage device within the control device 5, such as a plug-in hard drive, a Smart Media Card (SMC), a Secure Digital (SD) card, a Flash Card, etc., equipped within the control device 5. Furthermore, the memory 51 may include both an internal storage unit and an external storage device within the control device 5 of the online electromagnetic wire paint film thickness detection device. The memory 51 is used to store an operating system, application programs, a boot loader, data, and other programs, such as the program code of the computer program. The memory 51 may also be used to temporarily store data that has been output or is about to be output.

[0101] An embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps in any of the above method embodiments are implemented.

[0102] An embodiment of the present application provides a computer program product. When the computer program product is run on an electromagnetic wire paint film thickness online detection device, the electromagnetic wire paint film thickness online detection device implements the steps of any of the above-mentioned method embodiments.

[0103] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the process of the above-mentioned embodiment method by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, it can implement the steps of each of the above-mentioned method embodiments. The computer program includes computer program code, which can be in source code form, object code form, executable file, or some intermediate form. The computer-readable medium can at least include: any entity or device capable of carrying the computer program code to the electromagnetic wire paint film thickness online detection device, recording medium, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium. For example, a USB flash drive, mobile hard drive, magnetic disk, or optical disk.

[0104] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0105] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0106] In the embodiments provided in the present application, it should be understood that the disclosed electromagnetic wire paint film thickness online detection method, electromagnetic wire paint film thickness online detection device and electromagnetic wire paint film thickness online detection equipment can be implemented in other ways. For example, the above-described electromagnetic wire paint film thickness online detection method, electromagnetic wire paint film thickness online detection device and electromagnetic wire paint film thickness online detection equipment embodiments are merely illustrative. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0107] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0108] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A method for online detection of electromagnetic wire paint film thickness, characterized in that: The method is applied to an online detection device for electromagnetic wire paint film thickness, and the method comprises: Starting a heat preservation device; wherein the heat preservation device is used to keep the electromagnetic wire at a constant temperature to a first temperature; Starting a transmission device; wherein the transmission device transmits the electromagnetic wire through the induction coil at a first rate, and the electromagnetic wire is heated to a second temperature after passing through the induction coil; Acquire an infrared image captured by an infrared camera, and obtain surface temperature information of the electromagnetic wire from the infrared image; wherein the infrared camera is a linear array camera surrounding the electromagnetic wire, and the infrared image is a full-view surface image of the electromagnetic wire; Obtaining paint film thickness information according to the surface temperature information; wherein the paint film thickness information includes the paint film thickness value of the paint film at each position of the electromagnetic wire; A paint film breakage detection is performed on the paint film points in the paint film thickness information where the paint film thickness is lower than the first thickness threshold to obtain paint film breakage information; wherein, the paint film breakage detection is used to determine whether the paint film at the paint film point is broken, and the paint film breakage information is used to record the position of the paint film point on the electromagnetic wire where the paint film is broken.

2. The method for online detection of electromagnetic wire paint film thickness according to claim 1, wherein: The obtaining of the paint film thickness information according to the surface temperature information includes: Obtaining the heat conduction time and the thermal diffusion coefficient of the paint film; wherein the heat conduction time refers to the time difference between the electromagnetic wire passing through the induction coil and the infrared image being captured; The paint film thickness information is obtained according to the surface temperature information, the heat conduction time and the thermal diffusion coefficient of the paint film.

3. The method for online detection of electromagnetic wire paint film thickness according to claim 1, wherein: The performing paint film breakage detection on paint film points in the paint film thickness information where the paint film thickness is lower than a first thickness threshold includes: Controlling the first power supply to turn on; wherein the first power supply is used to make the electromagnetic wire belt have a fixed voltage; Obtaining coordinate information of paint film points whose paint film thickness is lower than a first thickness threshold in the paint film thickness information; wherein the coordinate information records the positions of all paint film points whose paint film thickness is lower than the first thickness threshold; According to the coordinate information, voltage detection is performed on all paint film points whose paint film thickness is lower than the first thickness threshold; wherein the detection head of the electromagnetic wire paint film thickness online detection device outputs a voltage value after performing voltage detection; If the output voltage of the detection head is greater than the first voltage threshold, the paint film at the corresponding paint film point has been broken; otherwise, the paint film at the corresponding paint film point has not been broken.

4. The method for online detection of electromagnetic wire paint film thickness according to claim 1, wherein: The infrared image includes a first line array image and a second line array image; the method further includes: obtaining first surface temperature information based on the first line array image; wherein the first line array image is captured by a first camera, the capturing area of ​​the first camera is fixed and located behind a heating area of ​​the electromagnetic wire, and the distance between the capturing area of ​​the first camera and the heating area is zero, and the heating area refers to the area where the induction coil heats the electromagnetic wire; obtaining second surface temperature information based on the second line array image; wherein the second line array image is captured by a second camera, the second camera's capturing area is movable, initially being the same as the capturing area of ​​the first camera, and moving synchronously with the electromagnetic wire at the first rate after the electromagnetic wire paint film thickness online detection device is activated; When the second surface temperature information indicates that the average surface temperature of the electromagnetic wire is greater than or equal to a third temperature, controlling the second camera to fix the shooting area, and obtaining third surface temperature information based on the line array image captured by the second camera after the shooting area is fixed; wherein the third temperature is between the first temperature and the second temperature; A temperature judgment is performed on the surface temperature of each paint film point in the first surface temperature information. If the surface temperature of the paint film point is greater than the first temperature, the paint film thickness is obtained according to the first surface temperature information. If the surface temperature of the paint film point is equal to the first temperature, the paint film thickness is obtained according to the third surface temperature information.

5. The method for online detection of electromagnetic wire paint film thickness according to claim 3, wherein: The detection head is two or more pulleys, the pulleys are insulated from each other, and the contact parts between the pulleys and the electromagnetic wires are composed of conductive materials. The detection head is used to detect the cracking of the paint film.

6. The method for online detection of electromagnetic wire paint film thickness according to claim 5, characterized in that: The method further comprises: Pulleys of different specifications are selected according to the electromagnetic wires of different diameters.

7. The method for online detection of electromagnetic wire paint film thickness according to claim 1, wherein: A value of a heating zone length of the induction coil divided by the first rate is less than 0.1 seconds.

8. The method for online detection of electromagnetic wire paint film thickness according to claim 1, wherein: The second temperature is greater than 50°C and less than 100°C.

9. An online detection device for electromagnetic wire paint film thickness, characterized in that: For implementing the method for online detection of electromagnetic wire paint film thickness according to any one of claims 1 to 8, the online detection device for electromagnetic wire paint film thickness comprises: Loading platform; A heat preservation device is provided on the supporting platform, and is used to keep the electromagnetic wire at a constant temperature of the first temperature; a transmission device, disposed on the carrying platform, and configured to transmit the electromagnetic wire at a first rate; an induction coil, disposed on the supporting platform, wherein the electromagnetic wire passes through the center of the induction coil, and the induction coil is used to heat the electromagnetic wire; an infrared camera, disposed on the supporting platform, surrounding the electromagnetic wire, and used for capturing an infrared image of the electromagnetic wire; A first detection pulley is provided on the supporting platform, wherein the first detection pulley is in close contact with the electromagnetic wire, and the contact portion is made of conductive material; The second detection pulley is disposed on the supporting platform, has the same specifications as the first detection pulley, and is symmetrical with the first detection pulley about the electromagnetic wire axis.

10. The on-line detection device for electromagnetic wire paint film thickness according to claim 9, characterized in that: The infrared camera also includes: A first camera is provided on the supporting platform and is used to capture a first line array image; The second camera is arranged on the supporting platform. The second camera can adjust the shooting angle and is used to shoot the second line array image.

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