A metal coating monitoring and adjustment system based on infrared imaging

Abstract

The present invention relates to a metal coating monitoring and adjustment system based on infrared imaging, comprising: an intelligent air knife and a high-speed infrared camera located in front of and / or behind the intelligent air knife; the intelligent air knife includes several independent air outlet modules, each of which has an air outlet hole at one end, and each air outlet module is arranged with its air outlet hole facing inward so that the shape of the trajectory of the air outlet hole matches the cross-sectional shape of the workpiece; the air outlet parameters of each air outlet module can be independently adjusted; the high-speed infrared camera is used to capture infrared images of the workpiece surface, and a computer performs image processing to obtain light and dark distribution information, and further obtains coating thickness distribution information on the workpiece surface by combining a pre-stored mapping relationship between light and dark and coating thickness; the computer adjusts the air outlet parameters of the intelligent air knife based on the coating thickness distribution information. The present invention solves the technical problem that existing workpiece coating processes cannot monitor coating thickness online and adjust air outlet parameters in different sections of the air knife.

Description

Technical Field

[0001] The present invention relates to the technical field of online monitoring and control of process, and in particular to a metal coating monitoring and adjustment system based on infrared imaging. Background Art

[0002] Galvanizing refers to the coating of metals, alloys, and other materials with a zinc layer for aesthetic purposes and rust prevention. For steel substrates, the metal coating is an anodic coating, primarily used to prevent corrosion. Its corrosion protection is highly dependent on the thickness of the coating, which should typically be within a range of 20 to 80 microns. However, existing production processes struggle to ensure uniform zinc coatings. The metal substrate often corrodes first in areas with thin zinc coatings, allowing harmful factors to continuously invade these thin areas, rendering the entire pipe useless and severely reducing the service life of the galvanized parts. Furthermore, manufacturers must adhere to relevant standards to ensure a minimum coating thickness. However, due to the instability of the coating thickness, zinc consumption increases significantly, resulting in higher costs.

[0003] The existing metal galvanizing production process usually relies on experience to control the coating thickness. Take the hot-dip galvanizing pipe process as an example. Figure 1 As shown, the process is roughly divided into three stages: suction and scooping, blowing and cooling and transportation. First, the metal pipe is immersed in the zinc pool for a period of time to react and form a thin composite layer. Then, the magnetic roller and the lifting mechanism are used to lift the metal pipe out of the zinc pool. Driven by the magnetic roller, it continues to be lifted along the roller table and passes through the middle of the fixed air ring. The fixed air ring acts as an air knife (the inner side of the fixed air ring is covered with air outlet holes). It continuously sprays the surface of the steel pipe to make the zinc layer uniform and blows the excess zinc liquid into the plating pool. After cooling and transportation, the final galvanized pipe product is formed.

[0004] However, this process has the following technical problems: (1) It is impossible to monitor the zinc layer thickness online and adjust the wind pressure and wind speed of the air knife in time during the production process; (2) The entire annular air knife is a fixed structure, which includes a ring with an air outlet gap opened on the surface of the ring towards the inner ring. The air is discharged through the air outlet gap. Each part of the annular air knife has uniform air discharge, and each part or annular segment cannot be adjusted separately. This will result in a high scrap rate and even cause the entire batch of parts to be scrapped due to the mismatch of the initial production process parameters. (3) After the metal pipe comes out of the zinc liquid pool, the zinc liquid attached to the bottom edge is thicker than other parts, and the uniform air discharge of the existing annular air knife cannot be targeted at the thicker zinc liquid at the bottom. Summary of the Invention

[0005] (1) Technical issues to be resolved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a metal coating monitoring and adjustment system based on infrared imaging, which solves the technical problem in the existing workpiece coating process that the coating thickness cannot be monitored online and the air outlet speed and pressure of different sections of the annular air knife cannot be adjusted in real time according to the distribution of the coating thickness.

[0007] (2) Technical solution

[0008] The present invention provides a metal coating monitoring and adjustment system based on infrared imaging, which comprises: an intelligent air knife, a first set of high-speed infrared cameras arranged in front of the intelligent air knife, and / or a second set of high-speed infrared cameras arranged behind the intelligent air knife;

[0009] The intelligent air knife includes several independent air outlet modules, each of which has an air outlet hole at one end. The air outlet modules are arranged with their air outlet holes facing inward and the other end facing outward, so that the shape of the trajectory of the air outlet holes of each air outlet module matches the cross-sectional shape of the workpiece; the air outlet parameters of each air outlet module can be independently and dynamically adjusted, or several adjacent air outlet modules form an air outlet section, and the air outlet parameters of the air outlet section can be independently adjusted;

[0010] The first group of high-speed infrared cameras and the second group of high-speed infrared cameras are connected to a computer. The first group of high-speed infrared cameras and the second group of high-speed infrared cameras are used to capture infrared images of the workpiece surface, transmit the infrared images to the computer, and the computer performs image processing to obtain corresponding light and dark distribution information; based on the light and dark distribution information, the computer combines a pre-stored mapping relationship between light and dark and coating thickness to further obtain the coating thickness distribution information on the workpiece surface; the computer adjusts the air outlet parameters of the intelligent air knife according to the coating thickness distribution information.

[0011] According to a preferred embodiment of the present invention, when the workpiece is a circular metal pipe, the air outlet modules are radially spliced ​​with their air outlets facing the same center point to form the intelligent air knife, and the air outlet trajectories of the air outlet modules are circular in shape; each air outlet module is provided with a high-pressure chamber, one side of which is connected to the air supply pipe, and the air outlet is connected to the high-pressure chamber; a piston body is provided within the high-pressure chamber, the piston body having a first end facing the air outlet and a second end opposite the air outlet; a piston push rod is connected to the side of the second end opposite the air outlet, the end of the piston push rod extends to the outside of the high-pressure chamber and is connected to a micro linear servo motor; the piston body is driven by the micro linear servo motor to move within the high-pressure chamber to adjust the effective volume of the high-pressure chamber and thereby adjust the air outlet pressure. Since the air supply pipe is continuously supplying air, when the air supply flow rate remains unchanged, the smaller the effective volume of the high-pressure chamber of the air outlet module, the greater the air outlet pressure of the air outlet module.

[0012] Furthermore, the air supply pipe connected to each air outlet module is provided with an independently controlled solenoid valve, the opening of which is dynamically adjusted by a computer so as to adjust the air outlet parameters (including wind speed, wind pressure and air volume) of each air outlet module from the air supply side.

[0013] According to a preferred embodiment of the present invention, the piston body is a piston body with a gradually changing cross-section, and the cross-sectional area of ​​the piston body gradually increases from the first end to the second end, and the second end of the piston body is tightly fitted with the inner wall of the high-pressure chamber; an angle is formed between the initial velocity of the wind ejected from the air outlet and the surface of the workpiece, and the angle is greater than 0 degrees and less than 90 degrees. The piston body with a gradually changing cross-section can improve the continuity of the adjustment of the air outlet parameters of the air outlet module and avoid jump-type adjustment. Preferably, a driving mechanism can also be provided for adjusting the angle; for example, when the plating solution is thinner, the angle can be reduced so that more wind is blown in a manner close to parallel to the workpiece surface; when the plating solution is thicker, the angle can be increased so that the ejected wind directly acts on the plating solution on the surface of the workpiece; but when the angle is large, the coating may become rougher.

[0014] According to a preferred embodiment of the present invention, the piston body is a needle-shaped piston body, and the first end of the piston body is a needle tip; under the drive of the micro linear servo motor, the needle tip of the needle-shaped piston body is inserted into the air outlet, thereby conveniently cleaning the metal plating liquid blocked in the air outlet without the need for manual cleaning by workers.

[0015] According to a preferred embodiment of the present invention, a portion where the high-pressure chamber communicates with the air outlet forms a conical transition zone, and the inner contour of the conical transition zone coincides with the outer contour of the needle-shaped piston body.

[0016] According to a preferred embodiment of the present invention, it also includes an annular motor seat, which is located on the outer ring of the intelligent wind knife and forms a concentric circle position relationship with the intelligent wind knife; the micro linear servo motor is installed on the annular motor seat, and each micro linear servo motor is respectively connected to a piston push rod of an air outlet module.

[0017] According to a preferred embodiment of the present invention, the first group of high-speed infrared cameras and the second group of high-speed infrared cameras respectively include 3-6 high-speed infrared cameras, and each high-speed infrared camera is arranged around the workpiece.

[0018] According to a preferred embodiment of the present invention, the first set of high-speed infrared cameras and the second set of high-speed infrared cameras collect mid-infrared rays with a wavelength of 3-50 μm. The sensing results of the first set of high-speed infrared cameras and the second set of high-speed infrared cameras can be mutually verified.

[0019] According to a preferred embodiment of the present invention, the coating is a zinc layer, a nickel layer, a copper layer, a titanium layer or other metal or non-metallic paint surface.

[0020] (3) Beneficial effects

[0021] The technical effects of the present invention are:

[0022] 1. The present invention uses infrared sensing technology to detect the thickness distribution of the plating solution on the workpiece surface. Based on this thickness distribution, the air output parameters of each air outlet module of the intelligent air knife are dynamically adjusted in real time. Areas of the workpiece surface with higher plating solution thickness are purged with higher air pressure and speed, while areas with lower pressure and speed are purged with lower pressure and speed. This improves the uniformity of the coating thickness distribution on the workpiece surface. This invention solves the technical problem of existing workpiece coating processes in which the coating thickness cannot be monitored online and the air output speed and pressure of different sections of the annular air knife cannot be adjusted accordingly based on the coating thickness distribution.

[0023] 2. The method for detecting the thickness of the plating solution based on infrared sensing technology provided by the present invention is a safe and reliable non-contact detection method. The infrared image collected by the infrared camera is processed by a computer to obtain the light and dark distribution information corresponding to the infrared image, and then combined with the pre-stored mapping relationship between light and dark and coating thickness to further obtain the coating thickness distribution information on the workpiece surface.

[0024] Although there are some non-contact methods for detecting thickness in the existing technology, such as electromagnetic induction, eddy current detection, X-ray fluorescence spectroscopy (XRF), laser confocal microscopy, etc., none of them are suitable for the field of workpiece coating process. The electromagnetic induction method is suitable for magnetic materials, but not for non-magnetic substrates such as aluminum and copper. The eddy current detection method is affected by the conductivity and surface roughness of the substrate; the XRF method has radiation and poor safety; the laser confocal microscopy has high requirements on the cleanliness of the sample surface and is slow, and is not suitable for the process environment of the present invention.

[0025] 3. The intelligent air knife of this invention is composed of several circularly connected air outlet modules, each with independently adjustable air flow parameters. To address the problem of thick plating solution adhering to the bottom edge of the workpiece, the air flow pressure or velocity of the air outlet modules at the bottom of the intelligent air knife can be adjusted to remove more plating solution, resulting in a more uniform coating on the workpiece surface. Furthermore, by combining the coating thickness distribution obtained by computer-generated infrared image light and dark distribution, the air flow parameters of the air outlet modules in corresponding sections of the intelligent air knife are specifically adjusted to further improve the uniformity of the coating thickness. The swept-out plating solution is returned to the plating tank, reducing plating solution consumption.

[0026] 4. When adjusting the air output parameters of each air outlet module, the position of the piston body in the high-pressure chamber is estimated by a micro linear servo motor, and the air output parameters of the air outlet module can be adjusted. Since the air supply duct continuously supplies air, and the air supplied must pass through the high-pressure chamber before being ejected, the larger the volume of the high-pressure chamber, the lower the ejected air speed and pressure. In addition, the needle tip of the needle-shaped piston body continuously approaches the air outlet and occupies the air outlet, making the actual air outlet cross-sectional area of ​​the air outlet increasingly smaller, which also serves the purpose of increasing the air outlet pressure. The needle tip of the needle-shaped piston body is inserted into the air outlet, which can easily clear the metal plating solution blocked in the air outlet, eliminating the need for workers to manually clean it. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of the galvanizing process for steel pipes in the prior art.

[0028] Figure 2 Schematic diagram of the coating process of the workpiece of the present invention.

[0029] Figure 3 The corresponding relationship between the infrared image of the steel pipe surface and the thickness of the zinc layer Figure 1 .

[0030] Figure 4 The corresponding relationship between the infrared image of the steel pipe surface and the thickness of the zinc layer Figure 2 .

[0031] Figure 5 Schematic diagram of the overall structure of the intelligent air knife.

[0032] Figure 6 Smart wind knife edge Figure 5 Schematic diagram of two air outlet modules on the vertical section of line L. DETAILED DESCRIPTION

[0033] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation methods in conjunction with the accompanying drawings.

[0034] Example 1

[0035] like Figure 1The figure shows a schematic diagram of the metal pipe coating process according to the present invention. The process is broadly divided into three stages: suction scooping, blowing, and cooling and transportation. First, a steel pipe 1 is immersed in a zinc bath for a period of time to react and deposit a layer of galvanizing liquid. Then, magnetic rollers 2 (which lift and scoop the steel pipe 1 by suction) and a lifting mechanism 3 cooperate to lift the steel pipe 1 out of the zinc bath. Driven by the magnetic rollers 2, the pipe 1 continues to rise along a roller conveyor (composed of multiple magnetic rollers 2) and passes through the center of an intelligent air knife 4. The intelligent air knife 4 emits air at a specific speed and pressure, which blows the surface of the steel pipe 1 to evenly coat the zinc layer and blows any excess liquid zinc into the coating bath. The pipe is then cooled and transported to form the final galvanized steel pipe. A first set of high-speed infrared cameras 51 and a second set of high-speed infrared cameras 52 are located on one side of the roller conveyor. The first set of high-speed infrared cameras 51 is located in front of the intelligent air knife 4, while the second set of high-speed infrared cameras 52 is located behind the intelligent air knife 4. The first and second sets of high-speed infrared cameras 51, 52 are also connected to a computer 6. Among them, the first group of high-speed infrared cameras 51 and the second group of high-speed infrared cameras 52 respectively include 3-6 high-speed infrared cameras, each of which is arranged around the steel pipe 1 to capture infrared images of the surface of the steel pipe 1 and transmit the infrared images to the computer 6. The computer 6 performs image processing to obtain corresponding light and dark distribution information. Based on the light and dark distribution information, the computer performs conversion processing in combination with the pre-stored mapping relationship between light and dark and coating thickness to obtain the distribution information of the zinc layer thickness on the surface of the steel pipe 1.

[0036] In the present invention, the principle of detecting the thickness of the zinc layer on the surface of the steel pipe 1 by a high-speed infrared camera is as follows:

[0037] Because the steel pipe 1, still coated with the plating solution, is at a high temperature upon exiting the plating bath, its surface emits infrared light. Since the steel pipe 1 and the zinc coating on its surface are made of different materials, their infrared emissivities differ. Steel pipe 1 is a steel-based material, and its infrared emissivity is greater than that of the zinc coating (see Table 1). This results in a brighter infrared image (also known as a thermal image) of the bare steel pipe 1, while the infrared image of the zinc coating is darker. Similarly, when galvanizing the steel pipe 1, the thicker the zinc coating, the darker the image. Conversely, the thinner the zinc coating, the darker the image and the brighter the image, closer to the infrared image of the bare steel pipe 1. Based on this principle, before the system of the present invention is officially used, infrared images of galvanized steel pipes and the corresponding zinc layer thickness (coating thickness is measured using a metal corrosion method) can be pre-produced and collected. These collected infrared images are then processed by a computer to obtain corresponding light and dark distribution information. The light and dark can then be quantified to obtain quantified light and dark data. A quantity-to-quantity mapping relationship is established between the light and dark data and the zinc layer thickness. Ultimately, a database containing a large amount of "infrared images" → light and dark distribution information → zinc layer thickness distribution information is obtained and pre-stored in the computer. During subsequent production process application, the computer processes the infrared images transmitted by the infrared camera and, in combination with the database, obtains the thickness distribution information of the zinc layer on the surface of the steel pipe 1.

[0038] Table 1: Infrared emissivity of zinc and steel

[0039]

[0040] like Figure 3 and Figure 4 The figures shown are all infrared images obtained by the present invention when photographing galvanized steel pipes in the laboratory using an infrared camera. Under laboratory conditions, the galvanized steel pipes are heated to a uniform temperature. Due to the high infrared emissivity of the steel-based material, the image appears bright, while the zinc layer has a low emissivity, resulting in a dark image. Infrared rays have a certain degree of penetrability. In areas where the coating is thinner, the infrared rays emitted by the steel pipe penetrate more, and the image of this area is brighter. In areas where the coating is thicker, the infrared rays emitted by the steel pipe penetrate less, and the image of this area is darker. In other words, the dark area has a low infrared emissivity, indicating that the zinc layer in this area is thicker; the bright area has a high infrared emissivity, indicating that the zinc layer in this area is thinner or the zinc layer is damaged (the steel pipe is partially exposed). Therefore, based on the infrared image captured by the infrared camera, the thickness of the zinc layer in that area can be identified.

[0041] There is theoretical support for the principle of high-speed infrared camera detecting the thickness of zinc layer on the surface of steel pipe 1. According to Planck's law and Wien's displacement law, metals at high temperature will radiate infrared rays of different wavelengths. The radiation energy is proportional to the fourth power of the temperature and the emissivity of the object. According to the Stefan-Boltzmann law in thermal radiation theory, the radiation emittance is proportional to the fourth power of the temperature and the emissivity of the object. ;in, is the Stefan-Boltzmann constant ; is the emissivity of the object; T is the absolute temperature of the object (K).

[0042] It should be noted that since the infrared emissivity of the base material and coating material of pipe fittings of different materials are different, the database needs to be constructed in a targeted manner.

[0043] Commonly used infrared light rays can be divided into near infrared, mid-infrared and far infrared according to the wavelength band, as follows: ① Near infrared (0.76-3μm): suitable for low temperature measurement, low radiation energy, but high sensitivity. ② Mid-infrared (3-50μm): high radiation energy, strong penetration ability. ③ Far infrared (15-1000μm): suitable for high temperature measurement, high radiation energy, but weak penetration ability. In the present invention, the first group of high-speed infrared cameras 51 and the second group of high-speed infrared cameras 52 preferably collect mid-infrared wavelength rays on the surface of the steel pipe 1 to obtain infrared images, and the sensing results of the first group of high-speed infrared cameras 51 and the second group of high-speed infrared cameras 52 can be verified with each other. Figure 3 Shown is the mid-infrared thermal image of the galvanized steel pipe captured by an infrared camera in the laboratory.

[0044] Combine Figure 1 and Figure 5 and Figure 6 As shown, the intelligent air knife 4 includes several independent air outlet modules 41, each of which has an air outlet hole 42 at one end. The air outlet modules 41 are radially spliced ​​with their air outlet holes 42 facing the same center point to form the intelligent air knife 4. Ultimately, the trajectory of the air outlet holes 42 of each air outlet module 41 is a circle to match the cross-section of the steel pipe 1. Among them, the air outlet parameters of each air outlet module 41 (the air outlet parameters are mainly the air outlet pressure or the initial air outlet velocity) can be independently and dynamically adjusted. Specifically, the air outlet parameters of each air outlet module 41 are independently adjusted by the computer 6 based on the thickness distribution information of the zinc layer on the surface of the steel pipe 1.

[0045] Recombination Figure 5 and Figure 6As shown, each air outlet module 41 is provided with a high-pressure chamber 40, one side of which is connected to the air supply pipe, and the air outlet hole 42 of each air outlet module 41 is connected to the high-pressure chamber 40. A piston body 43 is provided inside the high-pressure chamber 40, and the piston body 43 has a first end facing the air outlet hole 42 and a second end opposite the air outlet hole. A piston push rod 44 is connected to one side of the second end, and the end of the piston push rod 44 extends to the outside of the high-pressure chamber 40 and is connected to a micro linear servo motor 45. Driven by the micro linear servo motor 45, the piston body 43 moves within the high-pressure chamber 40 to change the effective volume of the high-pressure chamber 40. Since the air supply pipe is continuously supplying air, when the air supply flow rate remains unchanged, the smaller the effective volume of the high-pressure chamber of the air outlet module 41, the greater the air outlet pressure of the air outlet module 41. The number of the micro linear servo motors 45 may be equal to the number of the air outlet modules 41 , or several adjacent air outlet modules 41 may form an air outlet section, which shares one micro linear servo motor 45 .

[0046] In order to install these micro linear servo motors 45, an annular motor seat can be provided on the outer ring of the intelligent air knife, and these micro linear servo motors are installed on the annular motor seat.

[0047] In one embodiment, the piston body 43 is preferably a piston body with a gradual cross-section, and its cross-sectional area gradually increases from the first end to the second end. The second end of the piston body 43 is tightly fitted with the inner wall of the high-pressure chamber 40. The piston body with a gradual cross-section can make the effective volume of the high-pressure chamber 40 continuously adjustable, thereby making the air outlet parameters of the air outlet module 41 continuously adjustable, avoiding jump-like adjustments. Figure 6 As shown, in a more preferred embodiment of the present invention, the piston body 43 is a needle-shaped piston body, with the first end of the piston body 43 forming a needle tip. The area where the high-pressure chamber 40 connects to the air outlet 42 forms a tapered transition zone, the internal contour of which matches the external contour of the needle-shaped piston body 43. Driven by a micro linear servo motor 45, the needle tip of the needle-shaped piston body 43 can eventually be inserted into the air outlet 42, thereby conveniently clearing the metal plating solution clogged in the air outlet 42 without the need for manual cleaning by a worker. The initial velocity of the air ejected from the air outlet 42 forms an angle with the surface of the metal tube that is greater than 0 degrees and less than 90 degrees. Preferably, an independent drive mechanism can be provided to adjust this angle. For example, when the plating solution is thin, the angle can be reduced to allow more air to blow nearly parallel to the metal tube surface. When the plating solution is thick, the angle can be increased to allow the ejected air to directly impact the plating solution on the metal tube surface.

[0048] Furthermore, an independently controlled solenoid valve is provided at the connection between each air outlet module 41 and the air supply pipe, and the opening of the solenoid valve is dynamically adjusted by the computer 6 so as to adjust the air outlet parameters (including wind speed, wind pressure and air volume) of each air outlet module 41 from the air supply side. The adjustment of the air supply side and the adjustment of the piston body 43 in the high-pressure chamber 40 can be jointly applied to the coating process of the metal tube.

[0049] Example 2

[0050] This embodiment only includes a set of high-speed infrared cameras, which are set behind the intelligent wind knife 4. Due to the continuity of the galvanized defective parts (such as the damaged parts of the zinc layer) in the steel pipe galvanizing process, Figure 3 and Figure 4 The zinc layer accumulation (thicker areas), scratches, or damaged areas shown may have a trailing effect. Therefore, a set of high-speed infrared cameras is installed immediately behind the intelligent air knife 4 for real-time monitoring. This allows for timely detection of the galvanizing status and computer-adjusted operating parameters of the intelligent air knife 4. Furthermore, the mapping relationship between the infrared image behind the intelligent air knife 4 and the thickness is more clear, so the high-speed infrared camera installed behind the intelligent air knife 4 can more accurately detect the zinc layer thickness on the surface of the steel pipe 1.

[0051] Example 3

[0052] In Example 1, the air outlet holes 42 of each air outlet module 41 of the intelligent air knife 4 are arranged in a circular pattern to match the cross-section of the steel pipe 1. In this embodiment, if used in the production of galvanized steel sheets, the air outlet holes 42 of each air outlet module 41 of the intelligent air knife 4 are arranged in a square pattern to match the cross-section of the steel sheet, with the air outlet modules 41 surrounding the workpiece. If used in the production of galvanized triangular steel, the air outlet holes 42 of each air outlet module 41 of the intelligent air knife 4 are arranged in a triangle pattern to surround the workpiece.

[0053] Example 4

[0054] In the first embodiment, when used in the steel pipe galvanizing process, a database of the mapping relationship between the light and dark information distribution of infrared images and the galvanizing thickness needs to be pre-established in the computer for real-time monitoring of the thickness distribution information of the zinc layer on the substrate surface. In this embodiment, when the system of the present invention is used for nickel plating, copper plating, chromium plating, or titanium plating of workpieces, a database of the mapping relationship between the light and dark information distribution of infrared images and the thickness of the nickel layer, copper layer, chromium layer, or titanium layer on the substrate surface needs to be established in the computer.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements, or when the technical features in the above embodiments do not conflict with each other, can be combined in the manner described in the embodiments, and these modifications, replacements or combinations do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A metal coating monitoring and adjustment system based on infrared imaging, characterized in that: include: An intelligent air knife, a first set of high-speed infrared cameras arranged in front of the intelligent air knife, and / or a second set of high-speed infrared cameras arranged behind the intelligent air knife; The intelligent air knife includes several independent air outlet modules, each of which has an air outlet hole at one end. The air outlet modules are arranged with their air outlet holes facing inward and the other end facing outward, so that the shape of the trajectory of the air outlet holes of each air outlet module matches the cross-sectional shape of the workpiece; the air outlet parameters of each air outlet module can be independently and dynamically adjusted, or several adjacent air outlet modules form an air outlet section, and the air outlet parameters of the air outlet section can be independently adjusted; The first set of high-speed infrared cameras and the second set of high-speed infrared cameras are connected to a computer. The first set of high-speed infrared cameras and the second set of high-speed infrared cameras are used to collect mid-infrared wavelength rays from the surface of the workpiece to obtain infrared images, transmit the infrared images to the computer, and perform image processing by the computer to obtain corresponding light and dark distribution information; based on the light and dark distribution information, the computer combines a pre-stored mapping relationship between light and dark and coating thickness to further obtain coating thickness distribution information on the surface of the workpiece; the computer adjusts the air outlet parameters of the intelligent air knife according to the coating thickness distribution information; the workpiece is a steel-based material, and the coating is a zinc layer, a nickel layer, a copper layer, a titanium layer, or a non-metallic paint surface; Each of the air outlet modules is provided with a high-pressure chamber, one side of the high-pressure chamber is connected to the air supply pipe, and the air outlet is connected to the high-pressure chamber; a piston body is provided inside the high-pressure chamber, the piston body having a first end facing the air outlet and a second end opposite to the air outlet; a piston push rod is connected to the side of the second end opposite to the air outlet, the end of the piston push rod extends to the outside of the high-pressure chamber and is connected to a micro linear servo motor; the piston body is moved in the high-pressure chamber by the driving action of the micro linear servo motor; The piston body has a gradually changing cross-section, and the cross-sectional area of ​​the piston body gradually increases from the first end to the second end. The second end of the piston body is tightly fitted with the inner wall of the high-pressure chamber. The piston body is a needle-shaped piston body, and the first end of the piston body is a needle tip. Driven by the micro linear servo motor, the needle tip of the needle-shaped piston body is inserted into the air outlet.

2. The metal coating monitoring and adjustment system according to claim 1, characterized in that: When the workpiece is a circular metal pipe, the air outlet modules are radially spliced ​​with their air outlets facing the same center point to form the intelligent air knife, and the shape of the trajectory of the air outlet holes of the air outlet modules is circular.

3. The metal coating monitoring and adjustment system according to claim 2, characterized in that: The air supply pipe connected to each air outlet module is equipped with an independently controlled solenoid valve, the opening of which is dynamically adjusted by a computer so as to adjust the air outlet parameters of each air outlet module from the air supply side.

4. The metal coating monitoring and adjustment system according to claim 2, characterized in that: An angle is formed between the initial velocity of the wind ejected from the air outlet and the surface of the workpiece, and the angle is greater than 0 degrees and less than 90 degrees.

5. The metal coating monitoring and adjustment system according to claim 1, characterized in that: A conical transition zone is formed at the portion where the high-pressure chamber is connected to the air outlet, and the inner contour of the conical transition zone is consistent with the outer contour of the needle-shaped piston body.

6. The metal coating monitoring and adjustment system according to claim 1, characterized in that: It also includes an annular motor seat, which is located on the outer ring of the intelligent wind knife and forms a concentric circle position relationship with the intelligent wind knife; the micro linear servo motor is installed on the annular motor seat.

7. The metal coating monitoring and adjustment system according to claim 1, characterized in that: The first group of high-speed infrared cameras and the second group of high-speed infrared cameras include 3-6 high-speed infrared cameras respectively, and each high-speed infrared camera is arranged around the workpiece.

8. The metal coating monitoring and adjustment system according to claim 1, characterized in that: The first set of high-speed infrared cameras and the second set of high-speed infrared cameras collect mid-infrared rays with a wavelength of 3-50μm.

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