Online monitoring device for precoated metal coiled material production line

Abstract

The utility model is applicable to the technical field of electrostatic powder spraying of precoated metal coiled materials, and provides an online monitoring device for a precoated metal coiled material production line, which comprises a moving device and an online non-contact coating thickness gauge, the moving device comprises a guide rail, a moving base, a sliding block and a reciprocating motor, the front end of the online non-contact coating thickness gauge is provided with a pulse light source and an infrared detector, the lower end of the online non-contact coating thickness gauge is fixedly connected with a movable base through a bolt, the movable base is provided with a sliding block, the sliding block can flexibly move on a guide rail through a reciprocating motor, and the pulse light source at the front end of the online non-contact coating thickness gauge heats a coating to be measured according to the photo-thermal method principle. The built-in high-speed infrared detector carries out on-line real-time monitoring on the film thickness of an uncured coating on a coiled material plane, the process deviation is adjusted through control of a monitoring loop before the coiled material coating is cured, the coating thickness is reduced to be within a low tolerance threshold value, the consumption of powder coating is effectively reduced, and the quality stability of powder spraying is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of electrostatic spraying of metal coils, in particular to an online monitoring device for a pre-coated metal coil production line. Background Art

[0002] The coating of pre-coated metal coils must have a certain coating thickness. The coating thickness is a very important indicator in the detection of powder spraying products. It directly affects other performances of the product, including scratch resistance, hardness, corrosion resistance, aging resistance, etc. Therefore, the accurate measurement and monitoring of coating thickness is of great significance to the production enterprises of electrostatic powder spraying of pre-coated metal coils.

[0003] Pre-coated metal coils are lightweight, beautiful, and have good corrosion resistance. They can also be processed directly. They provide a new type of raw material for the construction industry, shipbuilding industry, vehicle manufacturing industry, home appliance industry, electrical industry, etc., and have achieved good results such as replacing wood with steel, efficient construction, energy conservation, and pollution prevention. The thickness of the coating plays a key role in its performance, so the measurement of coating thickness is an important part of quality control, and the test result is an important indicator for product quality determination.

[0004] In addition to the magnetic thickness measurement method, micrometer method, optical microscope method and drilling destruction microscopic thickness measurement method, the eddy current phase thickness measurement method is also an important coating thickness inspection method in GB / T 13448-2019 "Test Methods for Color Coated Steel Sheets and Strips", which can measure the coating thickness through different working principles. However, different measurement methods and principles all detect the cured coating, and need to contact or even destroy the metal substrate coating. In addition, the post-curing coating detection cannot provide timely feedback for the online production of pre-coated metal coils. Once the detection fails, the entire roll of metal coil will be lost, resulting in a waste of raw materials. Therefore, with the improvement of product quality requirements, it is necessary to monitor the thickness of the electrostatic powder spray coating of the pre-coated metal coil produced online. There is an urgent need for a non-contact online monitoring device that can provide real-time feedback on the coating thickness of the pre-coated metal coil before the electrostatic powder spray curing, timely correct the process parameters, avoid the waste of metal coil raw materials and powder coatings, and meet the quality index requirements of color-coated metal coils. Summary of the invention

[0005] In view of the above-mentioned needs, the purpose of the utility model is to provide an online monitoring device for a pre-coated metal coil production line, including a moving device and an online non-contact coating thickness gauge, the moving device including: a guide rail, a moving base, a slider, a reciprocating motor, a pulse light source and an infrared detector are provided at the front end of the online non-contact coating thickness gauge, and the lower end is fixedly connected with the moving base by bolts, the moving base is provided with a slider, and the slider can be flexibly moved on the guide rail by the reciprocating motor, the pulse light source at the front end of the online non-contact coating thickness gauge adopts the principle of photothermal method to heat the coating to be tested, the built-in high-speed infrared detector performs online real-time monitoring of the film thickness of the uncured coating on the coil plane, and the process deviation is adjusted before the coil coating is cured through the monitoring loop control, and the coating thickness is reduced to a lower tolerance threshold, thereby effectively reducing the consumption of powder coating and ensuring the quality stability of powder spraying.

[0006] To achieve the above-mentioned purpose, the utility model provides an online monitoring device for a pre-coated metal coil production line, wherein the online monitoring device for the pre-coated metal coil production line includes a moving device and an online non-contact coating thickness gauge, the moving device includes: a guide rail, a moving base, a slider, and a reciprocating motor. A pulse light source and an infrared detector are provided at the front end of the thickness gauge, and a moving base is fixedly connected with bolts at the lower end. A slider is provided on the moving base, and the slider can be moved left and right on the guide rail by a reciprocating motor. The online non-contact coating thickness gauge detects the thickness of the uncured coating of the electrostatic powder spraying of the pre-coated metal coil. The data results of the online monitoring device are interlocked with the parameters set by the sprayer controller system to form a loop monitoring control of the electrostatic powder spraying of the pre-coated metal coil.

[0007] As described above, the online monitoring device for the pre-coated metal coil production line, wherein the guide rail is one of a double-edge or single-side groove type, the guide rail is arranged parallel to the width direction of the metal coil, and both ends are fixed on the support columns on both sides of the metal coil conveying direction.

[0008] As described above, in the online monitoring device for the pre-coated metal coil production line, the slider is one of a circular roller slider and a ball slider, which is integrated with the movable base and installed on both sides or the side of the guide rail, and the interval between the sliders is adapted to the width of the guide rail.

[0009] As described above, the online monitoring device for the pre-coated metal coil production line is installed at the exit of the metal coil electrostatic powder spraying room, and the lateral distance from the conveyed metal coil is 10 to 100 cm.

[0010] In the online monitoring device for a pre-coated metal coil production line as described above, the light source of the online non-contact coating thickness gauge is pointed in a direction perpendicular to the width direction of the metal coil.

[0011] Compared with the prior art, the advantages of the utility model are as follows: the online monitoring device for the pre-coated metal coil production line provided by the utility model does not need to destroy the coating substrate, and can timely obtain the dry film thickness of the coating before curing by non-contact detection at the front end of the production line. The parameters are interlocked with the sprayer controller system through the online monitoring device to form a loop monitoring and control of the electrostatic powder spraying of the pre-coated metal coil, which can timely adjust the process deviation, effectively reduce the defective rate and rework rate, effectively reduce the consumption of powder coating, and ensure the quality stability of powder spraying.

[0012] The utility model provides an online monitoring device for a pre-coated metal coil production line, which is matched with a flexible mobile device and can be directly installed and fixed on the pre-coated metal coil electrostatic powder spraying production line, wherein the setting of the mobile base can fix the online non-contact coating thickness gauge, thereby improving the stability of the fixed installation of the online non-contact coating thickness gauge, and the setting of the guide rail and the slider widens the detection point and detection range of the online monitoring of the online non-contact coating thickness gauge, making the detection more flexible and accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The following drawings are only intended to illustrate and explain the present invention, and do not limit the scope of the present invention.

[0014] Figure 1 It is a structural schematic diagram of an online monitoring device for a pre-coated metal coil production line provided by the utility model;

[0015] Figure 2 The utility model is a schematic diagram of the structure of a mobile device for an online monitoring device for a pre-coated metal coil production line.

[0016] Explanation of the accompanying drawings: 1. Online non-contact coating thickness gauge, 2. Moving device, 3. Metal coil, 11. Pulse light source, 12. Infrared detector, 21. Guide rail, 22. Moving base, 23. Slider, 24. Bolt, 25 Reciprocating motor. DETAILED DESCRIPTION

[0017] In order to have a clearer understanding of the technical solution, purpose and effect of the utility model, the specific implementation mode of the utility model is now described in conjunction with the accompanying drawings.

[0018] like Figure 1 and Figure 2As shown, the utility model provides an online monitoring device for a pre-coated metal coil production line, including a mobile device 2 and an online non-contact coating thickness gauge 1, wherein the mobile device includes: a guide rail 21, a mobile base 22, a slider 23, and a reciprocating motor 25. The front end of the online non-contact coating thickness gauge 1 is provided with a pulse light source 11 and an infrared detector 12, and the lower end is fixedly connected with a mobile base 22 by bolts, and a slider 23 is provided on the mobile base 22. The slider 23 can be flexibly moved on the guide rail 21 by a reciprocating motor 25, effectively widening the detection point and detection range of the instrument.

[0019] The guide rail 21 is installed at the exit of the electrostatic powder spraying room of the electrostatic powder spraying production line for metal coils. The guide rail 21 is installed parallel to the metal coil and 30-50 cm away from the metal coil. The bolt 24 fastens the mobile base 22 under the online non-contact coating thickness gauge 1. The mobile base 22 is provided with thread holes at four corners. One end of the slider 23 is embedded in the thread holes on both sides of the mobile base 22 for fastening. Bolt holes are provided inside the thread holes for fastening the mobile base 22 to the online non-contact coating thickness gauge 1. The slider 23 is a round roller or ball, which is respectively embedded on both sides or one side of the guide rail 21. The groove slides, and the online non-contact coating thickness gauge 1 is reciprocated along the guide rail 21. When the metal coil at the outlet of the electrostatic spraying room of the production line is transported vertically, the online non-contact coating thickness gauge 1 and the moving device 2 are installed above the guide rail 21, and move along the width direction of the metal coil for detection; when the metal coil at the outlet of the electrostatic spraying room of the production line is transported horizontally, the online non-contact coating thickness gauge 1 and the moving device 2 are installed inverted below the guide rail 21, keeping the pulse light source 11 of the online non-contact coating thickness gauge 1 at a vertical angle to the surface coating of the metal coil, so as to meet the on-site detection needs.

[0020] Furthermore, the online non-contact coating thickness gauge 1 is fixedly connected to the mobile device 2, and the online non-contact coating thickness gauge 1 and the mobile base 22 are fastened with bolts 24 to increase the overall stability of the device. The slider 23 is embedded in the wire hole of the mobile base 22, and then the online non-contact coating thickness gauge 1 is arranged to slide on the guide rail 21, which increases the detection points on the surface of the metal coil and broadens the online detection range of the online non-contact coating thickness gauge 1, thereby expanding its application range in production line detection.

[0021] Furthermore, the size of the movable base 22 is adapted to the size of the bottom of the online non-contact coating thickness gauge 1 , the size of the bolt 24 hole of the movable base 22 is adapted to the bolt 24 hole of the bottom of the online non-contact coating thickness gauge 1 , and the size of the thread hole of the movable base 22 is adapted to the size of the inlay section of the slider 23 .

[0022] Furthermore, according to the conveying direction of the pre-coated metal coil at the spray chamber outlet, a double-edge guide rail 21 that can move above the guide rail 21 or a groove-shaped guide rail that can move on the side of the guide rail 21 can be selected. The guide rail 21 is set parallel to the width direction of the metal coil and is adapted to the width between the support columns on both sides. The two ends of the guide rail 21 are fixed on the support columns on both sides of the metal coil conveying direction, which is convenient for fixing the mobile device 2 and increasing the overall stability.

[0023] Furthermore, the power cord interface at the rear end of the online non-contact coating thickness gauge 1 is connected to the power cord for power supply, and the computer connection port is connected to the computer end. The detection point data of the online non-contact coating thickness gauge 1 is transmitted back to the computer system, and the detection data of the detection point distribution is analyzed and calculated. The final result is interlocked with the spraying parameters set by the spray controller. The spray controller sets the parameters to make process adjustments to the spraying parameters according to the thickness data fed back by the online non-contact coating thickness gauge, so as to avoid the production of defective products in advance.

[0024] The light source of the online non-contact coating thickness gauge 1 is a pulse heating method. The principle of pulse heating is to use the high-frequency vibration of electromagnetic waves to cause friction between molecules and atoms inside the object, thereby generating heat. During the pulse heating process, electromagnetic energy can be absorbed by the material and converted into heat energy, making the molecules in the material disperse and active, reaching a huge microscopic energy and kinetic energy state, thereby achieving rapid heating and conduction.

[0025] Furthermore, when the pre-coated metal coil at the outlet of the spray chamber is transported vertically, a roller embedded in the thread hole of the mobile base 22 is used, and the interval between the sliders 23 and the sliders 23 at the bottom of the mobile base 22 is adapted to the track width of the guide rail 21. At this time, the online non-contact coating thickness gauge 1 and the mobile device 2 are installed above the guide rail 21; when the pre-coated metal coil at the outlet of the spray chamber is transported horizontally, sliders 23 that are embedded and distributed on both sides of the guide rail 21 are used, and the two sides of the guide rail 21 are concave grooves, and the sliders 23 are continuously arranged and embedded on both sides of the guide rail 23. At this time, the mobile device 2 is installed on the side of the guide rail 21, and the light source of the online non-contact coating thickness gauge 1 is directed to the horizontally transported metal coil for detection.

[0026] The online non-contact coating thickness gauge 1 uses a computer to control the light source to pulse heat the coating to be tested on the metal coil electrostatic powder spraying. The built-in high-speed infrared detector records the surface temperature distribution of the powder coating from a distance and generates a temperature decay curve. The decay time of the surface temperature depends on the thickness of the powder coating and its thermal conductivity. Finally, the computer's system algorithm is used to analyze the surface dynamic temperature curve to calculate and measure the coating thickness to be tested.

[0027] The working principle of the online non-contact coating thickness gauge 1 is the photothermal infrared method. A light source is used to illuminate the surface of the metal coil. By modulating the intensity of the excitation light source, a heat wave is generated in the coil. The heat excited by the light source is propagated deep into the coating through the heat wave. This heat wave is reflected at the boundary between the coating and the substrate and finally propagates out of the coating and is received by the detector in the form of infrared thermal radiation. The thicker the coating, the longer the process takes. Therefore, the thickness information of the coating can be obtained by detecting the signal of infrared thermal radiation (phase shift) using the infrared detector 12. Since the time offset of the radiated heat wave relative to the excitation light wave is used to characterize the coating thickness, this measurement method is insensitive to changes in the measurement distance or detection angle. In this way, the coating thickness and surface density can be measured with very high precision. The accuracy of the photothermal infrared method is in the sub-micron range, which is usually much more accurate than other current industrial measurement methods.

[0028] By setting an online monitoring device at the exit of the electrostatic powder spraying room for pre-coated metal coils, the online monitoring device is fixed and moved by a mobile device 2, which broadens the detection range of the device, improves the flexibility of the online monitoring device during detection, and interlocks the parameters of the online monitoring device and the sprayer controller system to form a loop monitoring control for electrostatic powder spraying of pre-coated metal coils. Through the monitoring loop control, the process deviation is adjusted before the coil coating is cured, and the coating thickness is reduced to a lower tolerance threshold, which effectively reduces the consumption of powder coating, avoids the generation of defective products, and ensures the quality stability of powder spraying.

[0029] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. An online monitoring device for a pre-coated metal coil production line, characterized in that: The online monitoring device for the pre-coated metal coil production line includes a moving device and an online non-contact coating thickness gauge. The moving device includes: a guide rail, a moving base, a slider, and a reciprocating motor. The front end of the online non-contact coating thickness gauge is provided with a pulse light source and an infrared detector, and the lower end is fixedly connected with the moving base by bolts. The moving base is provided with a slider, and the slider can be moved left and right on the guide rail by the reciprocating motor. The online non-contact coating thickness gauge detects the thickness of the uncured coating of the electrostatic powder spraying of the pre-coated metal coil. The data results of the online monitoring device are interlocked with the setting parameters of the sprayer controller system to form a loop monitoring control of the electrostatic powder spraying of the pre-coated metal coil.

2. The online monitoring device for a pre-coated metal coil production line according to claim 1, characterized in that: The guide rail is a double-edge or single-side groove type. The guide rail is arranged parallel to the width direction of the metal coil, and both ends are fixed on the support columns on both sides of the metal coil conveying direction.

3. The online monitoring device for a pre-coated metal coil production line according to claim 1, characterized in that: The slider is one of a circular roller slider and a ball slider, which is integrated with the movable base and installed on both sides or the side of the guide rail. The interval between the sliders is adapted to the width of the guide rail.

4. The online monitoring device for a pre-coated metal coil production line according to claim 1, characterized in that: The installation position of the online monitoring device is located at the exit of the metal coil electrostatic powder spraying room, and the lateral distance from the conveyed metal coil is 10-100 cm.

5. The online monitoring device for a pre-coated metal coil production line according to claim 1, characterized in that: The light source of the online non-contact coating thickness gauge points in a direction perpendicular to the width direction of the metal coil.

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