Device for detecting cleanliness on line based on ultraviolet fluorescence method

Abstract

The utility model relates to the technical field of cleanliness detection, in particular to a device for detecting cleanliness on line based on an ultraviolet fluorescence method. The device for online detection of the cleanliness based on the ultraviolet fluorescence method comprises a measurement module; the measurement module comprises a light path module and a calibration module; the calibration module comprises a stepping motor, a standard sample bracket and a position detection sensor; the stepping motor is connected with the standard sample bracket and drives the standard sample bracket to rotate, and the standard sample bracket comprises a plurality of cleanliness sample bracket units and channels arranged among the cleanliness sample bracket units; and the position detection sensor is arranged on the standard sample bracket. The light path module carries out detection by adopting an ultraviolet fluorescence method, has high sensitivity to common pollutants such as oil stains and organic impurities on the metal plate strip, can accurately detect trace pollutants, and improves the precision of cleanliness detection.

Description

Technical Field

[0001] This utility model relates to the field of cleanliness detection technology, and in particular to a device for online cleanliness detection based on ultraviolet fluorescence method. Background Technology

[0002] In the production of sheet metal strips, surface cleanliness has a crucial impact on subsequent processing and product quality. For example, in automobile manufacturing, the presence of oil, impurities, or other contaminants on the surface of sheet metal strips can affect coating quality, leading to reduced coating adhesion and the appearance of spots. In the production of sheet metal strips for electronic devices, contaminants may affect the soldering and performance of electronic components.

[0003] Currently, traditional cleanliness testing methods have many shortcomings. Some offline testing methods, such as chemical analysis, can accurately detect contaminant components, but require sample collection and processing, which is cumbersome and time-consuming, and cannot achieve real-time monitoring. On the other hand, some online testing methods, such as those based on the principle of optical reflection, have low sensitivity for contaminants with optical properties similar to those on the surface of metal strips, making it difficult to accurately distinguish and quantify contaminants, and thus failing to meet the requirements for real-time and accurate cleanliness testing of metal strips in high-precision production processes. Utility Model Content

[0004] The primary objective of this invention is to provide an online cleanliness detection device based on ultraviolet fluorescence method. This online cleanliness monitoring device can overcome the shortcomings of existing detection methods, achieve rapid, accurate, and online detection of the cleanliness of metal strips, and provide timely feedback on the cleanliness status of metal strips during the production process, thereby ensuring product quality.

[0005] This invention provides a device for online detection of cleanliness based on ultraviolet fluorescence method, which includes a measurement module;

[0006] The measurement module includes an optical path module and a calibration module;

[0007] The calibration module includes a stepper motor, a standard sample holder, and a position detection sensor;

[0008] The stepper motor is connected to the standard sample holder and drives the rotation of the standard sample holder. The standard sample holder includes multiple cleanliness sample holder units and channels disposed between the cleanliness sample holder units.

[0009] The position detection sensor is mounted on a standard sample holder.

[0010] Preferably, the optical path module includes, from bottom to top, an adjustable aperture, a window, a dichroic mirror, a first narrowband filter, a lens, and a measurement photodetector;

[0011] A detection light emission device is arranged sequentially on the side of the dichroic mirror.

[0012] Preferably, the detection light emitting device includes a detection light source, a lens, and a second narrowband filter;

[0013] The detection light source, lens, and second narrowband filter are arranged sequentially, with the second narrowband filter located on the side closest to the dichroic mirror.

[0014] Preferably, the dichroic mirror is tilted.

[0015] Preferably, the standard sample holder is located on the lower side of the dichroic mirror.

[0016] Preferably, the standard sample holder includes three evenly arranged cleanliness sample holder units.

[0017] Preferably, a channel is formed between adjacent cleanliness sample holder units.

[0018] Preferably, it also includes a fixing bracket and a connecting bracket;

[0019] The fixed bracket is provided with a connecting bracket, which is connected to the measurement module.

[0020] Preferably, the measurement module is also connected to a control module.

[0021] Beneficial effects:

[0022] By installing an online cleanliness detection device on the metal sheet production line, online detection is achieved, which can monitor the cleanliness of the metal sheet and strip in real time during the production process without the need for sampling and offline analysis. This greatly improves production efficiency and provides timely feedback on cleanliness information, which helps to adjust the production process in a timely manner and reduce product quality defects caused by cleanliness issues.

[0023] To improve detection accuracy, a calibration module was designed to automatically calibrate the measurement module. The calibration method can be timed calibration or controlled by production line signals. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1A schematic diagram of the structure of the measurement module provided for a specific embodiment of this utility model;

[0026] Figure 2 A schematic diagram of the structure of the standard sample holder provided for a specific embodiment of this utility model;

[0027] Figure 3 A schematic diagram of the device for online detection of cleanliness based on ultraviolet fluorescence method provided for a specific embodiment of this utility model;

[0028] Figure label:

[0029] 1: Measurement module; 2: Stepper motor; 3: Standard sample holder; 4: Position detection sensor; 5: Adjustable aperture; 6: Window; 7: Dichroic mirror; 8: First narrowband filter; 9: First lens; 10: Measurement photodetector; 11: Detection light source; 12: Second lens; 13: Second narrowband filter; 14: Fixing bracket; 15: Connecting bracket; 16: Control module; 17: Light intensity monitoring detector. Detailed Implementation

[0030] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0031] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] like Figures 1 to 3 As shown, this embodiment provides a device for online detection of cleanliness based on ultraviolet fluorescence method, which includes a measurement module 1.

[0034] Measurement module 1 includes an optical path module and a calibration module.

[0035] The calibration module includes a stepper motor 2, a standard sample holder 3, and a position detection sensor 4.

[0036] Stepper motor 2 is connected to standard sample holder 3 and drives the rotation of standard sample holder 3. Standard sample holder 3 includes multiple cleanliness sample holder units and channels disposed between adjacent cleanliness sample holder units.

[0037] The position detection sensor 4 is mounted on the standard sample holder 3.

[0038] In this embodiment, the optical path module uses ultraviolet fluorescence for detection, which has high sensitivity to common pollutants such as oil and organic impurities on metal strips, and can accurately detect trace pollutants, thus improving the accuracy of cleanliness detection.

[0039] By installing an online cleanliness detection device on the metal sheet production line, online detection is achieved, which can monitor the cleanliness of the metal sheet and strip in real time during the production process without the need for sampling and offline analysis. This greatly improves production efficiency and provides timely feedback on cleanliness information, which helps to adjust the production process in a timely manner and reduce product quality defects caused by cleanliness issues.

[0040] To improve detection accuracy, a calibration module was designed to automatically calibrate the measurement module. Calibration can be timed or controlled by production line signals. The calibration device consists of a stepper motor 2, a standard sample holder 3, and a position detection sensor 4. The sample holder 3 has channels and several standard cleanliness sample holder units. During normal detection, the optical path passes through the channel position of the standard sample holder 3, allowing the detection light and fluorescence signal to pass through the detection channel to detect the sample. When calibration is initiated, the stepper motor drives the sample holder 3 to rotate the standard samples sequentially to the center position of the optical path for signal detection and calibration of the measurement module. The sample position is determined by the position detection sensor 4. After calibration, the channel position is rotated to the center of the optical path to resume normal measurement.

[0041] The optical path module includes, from bottom to top, an adjustable aperture 5, a window 6, a dichroic mirror 7, a first narrowband filter 8, a first lens 9, and a measuring photodetector 10. A detection light emitting device is arranged sequentially on the side of the dichroic mirror 7.

[0042] The detection light emission device includes a detection light source 11, a second lens 12, and a second narrowband filter 13. The detection light source 11, the second lens 12, and the second narrowband filter 13 are arranged sequentially, and the second narrowband filter 13 is located on the side closer to the dichroic mirror 7.

[0043] The dichroic mirror 7 is tilted. The standard sample holder 3 is located below the dichroic mirror 7. The standard sample holder 3 includes three evenly arranged cleanliness sample holder units. A channel is formed between adjacent cleanliness sample holder units.

[0044] To further illustrate the above-described online cleanliness detection device, this embodiment also provides an explanation of the operation process of the above-described online cleanliness detection device, as shown below:

[0045] The ultraviolet light source can emit light within a first preset wavelength range to illuminate the surface to be tested and excite the pollutants on the surface to fluoresce. Specifically, the detection light source is used to emit detection light, the convex surface of the detection light single lens faces the dichroic mirror, and the emitting end of the detection light source is located at the focal point of the detection light single lens, so that the detection light emitted by the detection light emitter passes through the detection light single lens and then propagates as parallel detection light towards the dichroic mirror, thereby improving the light utilization rate.

[0046] The detection light beam propagates vertically downwards under the reflection of a dichroic mirror and converges at the workpiece surface as a detection point beam after passing through an adjustable aperture. If the cleanliness of the workpiece surface is substandard, contaminants on the surface will emit multiple sets of second-wavelength fluorescent light after being illuminated by the detection point beam. These fluorescent lights then pass through the adjustable aperture and propagate upwards as parallel fluorescent rays through the dichroic mirror. When the fluorescent light passes through a first narrow-band filter, it filters out wavelengths other than the second wavelength from the parallel fluorescent light, meaning only the second-wavelength parallel fluorescent light can pass through the first narrow-band filter. Subsequently, the parallel fluorescent light passes through a lens and converges at the receiving end of a photodetector as a fluorescent point beam. The photodetector receives the fluorescent point beam signal and converts it into an electrical signal, which is then transmitted to an external data processing system. The external data processing system processes the electrical signal and obtains its value. By referring to the magnitude of the electrical signal value, the degree of dirt on the workpiece surface can be determined.

[0047] The second narrowband filter is used to filter out detection light of wavelengths other than the first preset wavelength in the detection parallel light. In other words, only the detection light of the first preset wavelength can pass through the detection light filter, reducing the error value and thus improving the detection accuracy.

[0048] The first narrowband filter filters out stray light outside the second preset wavelength range, thereby allowing the excited fluorescence band to enter the detector. The photodetector receives the fluorescence passing through the filter and converts the fluorescence into an electrical signal.

[0049] The device for online cleanliness detection based on ultraviolet fluorescence method also includes a fixed bracket 14 and a connecting bracket 15. The connecting bracket 15 is mounted on the fixed bracket 14 and is connected to the measurement module. The measurement module is also connected to a control module 16.

[0050] The control module 16 includes a light source driving unit, a signal detection unit, a data acquisition unit, and a communication unit. The communication module is connected to a host computer.

[0051] The control module is connected to the light source and the photodetector. The control module can drive the light source to emit light of a specific wavelength and receive the electrical signal converted by the photodetector. After the data acquisition unit processes the acquired data, the control module transmits the detection data to the host computer for processing and display through the communication unit.

[0052] It should be noted that this embodiment only protects the structure of the device for online cleanliness detection. The circuits of the control module and the host computer, as well as the processing methods used in the control module and the host computer, are all based on existing technologies. In other words, this application does not involve any improvements to the program, circuits, or methods.

[0053] To further explain the above-described online cleanliness detection device, this embodiment also provides a specific workflow of the device, as shown below:

[0054] (I) Installation and Commissioning of Equipment

[0055] 1. Fix the cleanliness detection module to the connecting bracket, and install it in a suitable position on the production line using the fixing bracket;

[0056] 2. Connect the cleanliness detection module to the host computer via a communication cable;

[0057] 3. Adjust the detection height to the instrument's designed measurement height;

[0058] (II) Online Detection Process

[0059] 1. During the production of metal strip, the metal strip passes through the detection area of ​​the ultraviolet fluorescence excitation module under the action of the conveying unit. The ultraviolet light source is controlled by the control module to irradiate the surface of the metal strip, exciting surface contaminants to produce fluorescence.

[0060] 2. The fluorescence detector in the fluorescence detection module receives the fluorescence signal, which is amplified by the signal amplification circuit and then transmitted to the control module. After analog-to-digital conversion, the amplified analog signal is converted into a digital signal, and the data is filtered.

[0061] 3. The control module periodically collects the analog signal output by the temperature sensor and obtains the ambient temperature after analog-to-digital conversion.

[0062] 4. Each time the control module collects fluorescence and temperature signals, it promptly sends the data to the host computer via the communication module for data processing, including secondary filtering, temperature compensation, unit conversion, real-time curve display, and data saving.

[0063] 5. When the cleanliness data is lower than the set threshold, the software will issue an alarm to prompt the operator that the cleanliness of the metal strip is abnormal. The operator can take corresponding measures in a timely manner based on the displayed information, such as adjusting the cleaning process or checking whether there are any sources of pollution in the production process.

[0064] 6. The optical lens has a built-in adjustable aperture, which can be used to easily adjust the size of the measuring spot according to the actual size of the object being measured and the application conditions.

[0065] 7. The light intensity monitoring detector 17 measures the light intensity emitted by the ultraviolet light source in real time and provides real-time feedback to the light source control circuit, ensuring that the light source remains stable at a certain luminous intensity and avoiding the impact of light intensity changes on measurement accuracy.

[0066] 8. The measurement process employs a flashing light source mode. When the light source is off, the photodetector detects the signal intensity, which is used as the background value VD1, representing the detector's dark current and the influence of ambient light. When the light source is on, the acquired signal is VD2. The measured cleanliness signal value is:

[0067] VD = VD2 - VD1

[0068] This eliminates the influence of ambient light and detector dark current on the detection results in real time.

[0069] 9. Because the system uses a parallel beam for measurement, it is less affected by changes in product height.

[0070] 10. The sensor can be calibrated periodically or as needed by the production line, which improves the detection accuracy.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A device for online detection of cleanliness based on ultraviolet fluorescence method, characterized in that, Includes a measurement module; The measurement module includes an optical path module and a calibration module; The calibration module includes a stepper motor, a standard sample holder, and a position detection sensor; The stepper motor is connected to the standard sample holder and drives the rotation of the standard sample holder. The standard sample holder includes multiple cleanliness sample holder units and channels disposed between the cleanliness sample holder units. The position detection sensor is mounted on a standard sample holder.

2. The device for online detection of cleanliness based on ultraviolet fluorescence method according to claim 1, characterized in that, The optical path module includes, from bottom to top, an adjustable aperture, a window, a dichroic mirror, a first narrowband filter, a lens, and a measurement photodetector; A detection light emission device is arranged sequentially on the side of the dichroic mirror.

3. The device for online detection of cleanliness based on ultraviolet fluorescence method according to claim 2, characterized in that, The detection light emitting device includes a detection light source, a lens, and a second narrowband filter; The detection light source, lens, and second narrowband filter are arranged sequentially, with the second narrowband filter located on the side closest to the dichroic mirror.

4. The device for online detection of cleanliness based on ultraviolet fluorescence method according to claim 2, characterized in that, The dichroic mirror is tilted.

5. The device for online detection of cleanliness based on ultraviolet fluorescence method according to claim 2, characterized in that, The standard sample holder is located on the lower side of the dichroic mirror.

6. The device for online detection of cleanliness based on ultraviolet fluorescence method according to claim 5, characterized in that, The standard sample holder includes three evenly spaced cleanliness sample holder units.

7. The device for online detection of cleanliness based on ultraviolet fluorescence method according to claim 6, characterized in that, A channel is formed between adjacent cleanliness sample holder units.

8. The device for online detection of cleanliness based on ultraviolet fluorescence method according to claim 2, characterized in that, It also includes fixed brackets and connecting brackets; The fixed bracket is provided with a connecting bracket, which is connected to the measurement module.

9. The device for online detection of cleanliness based on ultraviolet fluorescence method according to claim 6, characterized in that, The measurement module is also connected to a control module.

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