A strip pickling monitoring system and control method thereof

Abstract

The present application belongs to the technical field of strip steel processing, and discloses a strip steel pickling monitoring system and a control method thereof. A first image detection device and a second image detection device are used to collect surface images of the strip steel before and after pickling in real time. By comparing the surface images before and after pickling, it can be determined whether there is insufficient pickling, and then whether there is nozzle blockage. When nozzle blockage is detected, a vacuum cleaning device is used to perform vacuum suction to quickly remove loose blockages at the nozzle, and then the nozzle is rinsed with clean pickling liquid to completely remove soluble attachments attached to the inner surface of the nozzle; thereby, the blockage of the nozzle of the spray device can be detected online, and efficient automatic cleaning can be performed in time to ensure the pickling effect.

Description

Technical Field

[0001] The present application relates to the technical field of strip steel processing, and in particular to a strip steel pickling monitoring system and a control method thereof. Background Art

[0002] Pickling is an essential process in the production of strip steel. It can remove the oxide layer on the surface of the strip steel. Generally, a strip steel pickling device is used for pickling.

[0003] During the pickling process, pickling is achieved by spraying pickling liquid onto the strip through a spray device, wherein the pickling liquid is recycled (after the pickling liquid is sprayed onto the strip, it will fall into the pickling tank below the strip, and the pickling liquid will be drawn out of the pickling tank through the pickling liquid circulation system and then supplied to the spray device again, and so on), until the impurity content in the pickling liquid is too high or the pickling liquid concentration (referring to the H+ ion concentration therein) is too low, the pickling liquid is replaced. Before the pickling liquid is replaced, the impurities in the pickling liquid will increase, causing the nozzle of the spray device to gradually clog, affecting the pickling effect.

[0004] Therefore, the prior art needs to be improved and enhanced. Summary of the invention

[0005] The purpose of the present application is to provide a strip pickling monitoring system and a control method thereof, which can detect the blockage of the nozzle of the spray device online, and automatically clear the blockage in a timely and efficient manner to ensure the pickling effect.

[0006] In a first aspect, the present application provides a strip steel pickling monitoring system, comprising a main control module, a pickling tank, a spray device arranged in the pickling tank, a circulating liquid supply system, a cleaning device, a drying device and a conveying device, wherein the conveying device is used to sequentially convey the strip steel to the pickling tank, the cleaning device and the drying device, the circulating liquid supply system is used to provide pickling liquid to the spray device, the spray device is used to spray the pickling liquid onto the strip steel for pickling, the cleaning device is used to clean the strip steel after pickling, and the drying device is used to dry the cleaned strip steel; further comprising a clearing system, a first image detection device and a second image detection device;

[0007] The first image detection device is arranged upstream of the pickling tank and is used to collect the surface image of the steel strip; the second image detection device is arranged downstream of the drying device and is used to collect the surface image of the steel strip;

[0008] The clearing system is connected to the spray device and includes a vacuum clearing device and a pickling clearing device; the vacuum clearing device is used to preliminarily clear the blockage at the nozzle of the spray device by vacuum suction, and the pickling clearing device is used to further clear the blockage at the nozzle of the spray device by using clean pickling liquid;

[0009] The main control module is electrically connected to the circulating liquid supply system, the clearing system, the first image detection device and the second image detection device, and is used to compare the images captured by the first image detection device and the second image detection device to detect whether the nozzle of the spray device is blocked, and control the clearing system to clear the nozzle of the spray device when blocked.

[0010] During operation, the first image detection device and the second image detection device are used to collect surface images of the strip before and after pickling in real time. By comparing the surface images before and after pickling, it can be determined whether the pickling is insufficient, and then whether the nozzle is blocked. When nozzle blockage is detected, vacuum suction is performed by the vacuum cleaning device to quickly remove loose blockages at the nozzle, and then the nozzle is rinsed with clean pickling liquid to completely remove soluble attachments attached to the inner surface of the nozzle; thereby, the blockage of the nozzle of the spray device can be detected online, and efficient automatic cleaning can be performed in time to ensure the pickling effect.

[0011] Preferably, the spray device comprises two spray bodies disposed vertically opposite to each other; there is a gap between the two spray bodies for the strip steel to pass through, and a plurality of nozzles distributed in a matrix are arranged on opposite sides of the two spray bodies, wherein the row direction of the matrix is ​​parallel to the left-right direction, and the column direction is parallel to the front-back direction;

[0012] The spray body is provided with a plurality of cavities arranged in the left-right direction and isolated from each other, and each cavity extends in the front-back direction; each column of the nozzles is connected with each cavity respectively, and each cavity is connected with the circulating liquid supply system and the clearing system through an independent first reversing valve; the first reversing valve is electrically connected with the main control module.

[0013] By setting up isolated cavities, each column of nozzles is connected to each cavity respectively. When only some of the nozzles are blocked, only the corresponding cavity and the clearing system are connected to clear the blockage of some nozzles. Compared with the method of clearing all nozzles at the same time, under the condition of certain performance of the clearing system, the clearing efficiency is higher, thereby having less impact on the efficiency of strip pickling work.

[0014] Preferably, the vacuum clearing device comprises a vacuum tank and a vacuum pump for evacuating the vacuum tank, the vacuum tank is connected to each of the first reversing valves through a pipeline; the vacuum pump is electrically connected to the main control module.

[0015] The vacuum tank can be evacuated in advance and the vacuum state of the vacuum tank can be maintained. When clearing is required, after the first reversing valve is connected to the vacuum tank and the cavity, a strong suction force can be generated immediately, which greatly shortens the time of vacuum suction clearing and improves the clearing efficiency. Therefore, even if the strip does not stop moving during the vacuum suction clearing process, the impact on the pickling effect is very small. On the premise of ensuring the pickling effect, online clearing can be achieved without stopping the machine.

[0016] Preferably, the pickling and unblocking device includes a first storage tank and a cleaning pump, the first storage tank is used to store clean pickling liquid, the input end of the cleaning pump is connected to the first storage tank, and the output end of the cleaning pump is connected to each of the first reversing valves through a pipeline; the cleaning pump is electrically connected to the main control module.

[0017] Preferably, the clearing system further comprises a second reversing valve, and the vacuum clearing device, the acid cleaning device and each of the first reversing valves are connected to the second reversing valve via a pipeline; and the second reversing valve is electrically connected to the main control module.

[0018] Preferably, the circulating liquid supply system includes a second storage tank, an infusion pump and a reflux pump; the second storage tank is used to store pickling liquid; the input end of the infusion pump is connected to the second storage tank, and the output end of the infusion pump is connected to each of the first reversing valves through a pipeline; the input end of the reflux pump is connected to the pickling tank, and the output end of the reflux pump is connected to the second storage tank through a pipeline; the infusion pump and the reflux pump are both electrically connected to the main control module.

[0019] Preferably, the first image detection device comprises two first cameras and two first irradiation lamps, the two first irradiation lamps are respectively used to irradiate the upper and lower surfaces of the steel strip to form a first illumination area, and the two first cameras are respectively used to collect images of the upper and lower surfaces of the steel strip including the first illumination area;

[0020] The second image detection device includes two second cameras and two second irradiation lamps, the two second irradiation lamps are respectively used to illuminate the upper and lower surfaces of the steel strip to form a second illumination area, and the two second cameras are respectively used to capture images of the upper and lower surfaces of the steel strip including the second illumination area.

[0021] Preferably, the first lighting area and the second lighting area are both strip-shaped areas extending in the left-right direction.

[0022] In a second aspect, the present application provides a control method for the strip pickling monitoring system as described above, which is applied to the main control module of the strip pickling monitoring system, comprising the steps of:

[0023] A1. Acquire a first image captured in real time by the first image detection device and a second image captured in real time by the second image detection device;

[0024] A2. comparing the first image and the second image to determine whether there is a poor area on the surface of the strip due to insufficient pickling;

[0025] A3. If there is a defective area, the nozzles in each column whose row position falls into the defective area are regarded as blocked nozzles, and the blocked nozzles are cleared by the clearing system.

[0026] Preferably, in step A3, clearing the blocked nozzle by using the clearing system includes:

[0027] Control the first reversing valve corresponding to the blocking nozzle to connect the corresponding cavity and the blocking clearing system;

[0028] Using the vacuum clearing device to perform vacuum suction on the cavity corresponding to the blocked nozzle;

[0029] After the vacuum suction is completed, the pickling and unblocking device is used to transport clean pickling liquid to the cavity corresponding to the blocked nozzle.

[0030] Beneficial effects: The strip pickling monitoring system and control method provided by the present application, when working, use the first image detection device and the second image detection device to collect the surface images of the strip before and after pickling in real time. By comparing the surface images before and after pickling, it can be determined whether the pickling is insufficient, and then judge whether there is a nozzle blockage. When the nozzle is detected to be blocked, the vacuum cleaning device is used to perform vacuum suction to quickly clear the loose blockage at the nozzle, and then the nozzle is rinsed with clean pickling liquid to completely remove the soluble attachments attached to the inner surface of the nozzle; thereby, the blockage of the nozzle of the spray device can be detected online, and efficient automatic cleaning can be performed in time to ensure the pickling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of the structure of a strip pickling monitoring system provided in an embodiment of the present application.

[0032] Figure 2 It is a schematic diagram of the structure of the spray body.

[0033] Figure 3 for Figure 2 Cross-sectional view at position AA.

[0034] Figure 4 This is a connection diagram of electrical equipment of a strip pickling monitoring system provided in an embodiment of the present application.

[0035] Figure 5A flow chart of a control method provided in an embodiment of the present application.

[0036] Explanation of reference numerals: 1. Main control module; 2. Pickling tank; 3. Spraying device; 301. Spraying body; 302. Nozzle; 303. Cavity; 304. First reversing valve; 305. First main pipe; 306. Second main pipe; 4. Circulating liquid supply system; 401. Second storage tank; 402. Infusion pump; 403. Reflux pump; 5. Cleaning device; 6. Drying device; 7. Conveying device; 8. Blockage clearing system; 801. Vacuum blockage clearing device; 8011. Vacuum tank; 8012. Vacuum pump; 802. Pickling blockage clearing device; 8021. First storage tank; 8022. Cleaning pump; 803. Second reversing valve; 9. First image detection device; 901. First camera; 902. First irradiation lamp; 10. Second image detection device; 1001. Second camera; 1002. Second irradiation lamp; 90. Strip steel. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0038] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0039] For the convenience of explanation, in this application, the width direction of the strip steel 90 during operation is set as the left-right direction (i.e. Figure 1 The direction perpendicular to the paper surface in the figure) sets the moving direction of the strip steel 90° during operation to the backward direction (i.e. Figure 1 ), the forward and backward directions are opposite (i.e. the forward direction is Figure 1 The normal direction of the strip steel at 90° during operation is set to the up-down direction (i.e. Figure 1 left and right directions in the image).

[0040] Please refer to Figure 1-Figure 4, is a steel strip pickling monitoring system in some embodiments of the present application, comprising a main control module 1, a pickling tank 2, a spray device 3 arranged in the pickling tank 2, a circulating liquid supply system 4, a cleaning device 5, a drying device 6 and a conveying device 7, wherein the conveying device 7 is used to sequentially convey the steel strip 90 to the pickling tank 2, the cleaning device 5 and the drying device 6, the circulating liquid supply system 4 is used to provide pickling liquid to the spray device 3, the spray device 3 is used to spray the pickling liquid onto the steel strip 90 for pickling, the cleaning device 5 is used to clean the steel strip 90 after pickling, and the drying device 6 is used to dry the cleaned steel strip 90; further comprising a clearing system 8, a first image detection device 9 and a second image detection device 10;

[0041] The first image detection device 9 is arranged upstream of the pickling tank 2 and is used to collect the surface image of the steel strip 90; the second image detection device 10 is arranged downstream of the drying device 6 and is used to collect the surface image of the steel strip 90;

[0042] The clearing system 8 is in communication with the spray device 3, and comprises a vacuum clearing device 801 and a pickling clearing device 802; the vacuum clearing device 801 is used to preliminarily clear the blockage at the nozzle 302 of the spray device 3 by vacuum suction, and the pickling clearing device 802 is used to further clear the blockage at the nozzle 302 of the spray device 3 by using a clean pickling liquid (i.e., a pre-prepared, unused pickling liquid, the type of which is the same as the type of the pickling liquid provided by the circulating liquid supply system 4);

[0043] The main control module 1 is electrically connected to the circulating liquid supply system 4, the clearing system 8, the first image detection device 9 and the second image detection device 10, and is used to compare the images captured by the first image detection device 9 and the second image detection device 10 to detect whether the nozzle 302 of the spray device 3 is blocked, and control the clearing system 8 to clear the nozzle 302 of the spray device 3 when blocked.

[0044] In fact, there are mainly two types of blockages that cause the nozzle 302 to be blocked. The first type is loose blockages formed by suspended particles and debris in the pickling solution gathering at the nozzle 302 (looseness here is a relative concept, which means that this type of blockage has less adhesion to the nozzle 302 than the second type of blockage). The second type is soluble attachments formed by precipitation due to the excessive concentration of soluble impurities (such as ferric chloride) in the pickling solution and adhering to the inner wall of the nozzle 302.

[0045] During operation, the first image detection device 9 and the second image detection device 10 are used to collect the surface images of the steel strip 90 before and after pickling in real time. By comparing the surface images before and after pickling, it can be determined whether the pickling is insufficient, and then whether the nozzle 302 is blocked (generally, before pickling, the concentration of the pickling solution, the spray flow rate of the spray device 3 and the moving speed of the steel strip 90 are pre-set according to the oxidation degree of the steel strip 90 to ensure that the oxide layer of the steel strip 90 can be fully removed after pickling under normal circumstances. Therefore, if the pickling is insufficient, it is usually when the spray flow rate of the spray device 3 reaches The reason why the spray flow rate of the spray device 3 does not meet the preset value is that the nozzle 302 is blocked; therefore, if the pickling is insufficient, it can be judged that the nozzle 302 is blocked). When the nozzle 302 is detected to be blocked, the vacuum cleaning device 801 is used to perform vacuum suction to quickly remove the loose blockage at the nozzle 302, and then the nozzle 302 is rinsed with clean pickling liquid to completely remove the soluble attachments attached to the inner surface of the nozzle 302; thereby, the blockage of the nozzle 302 of the spray device 3 can be detected online, and efficient automatic cleaning can be performed in time to ensure the pickling effect.

[0046] Specifically, see Figure 1-Figure 3 The spray device 3 includes two spray bodies 301 disposed vertically opposite to each other; there is a gap between the two spray bodies 301 for the strip steel 90 to pass through, and a plurality of nozzles 302 distributed in a matrix are arranged on opposite sides of the two spray bodies 301, wherein the row direction of the matrix is ​​parallel to the left-right direction, and the column direction is parallel to the front-back direction;

[0047] A plurality of cavities 303 arranged in the left-right direction and isolated from each other are provided in the spray body 301, and each cavity 303 extends in the front-back direction; each column of nozzles 302 is connected to each cavity 303 respectively (the nozzles 302 in the same column are connected to the same cavity 303, and the nozzles 302 in different columns are connected to different cavities 303), and each cavity 303 is connected to the circulating liquid supply system 4 and the clearing system 8 through an independent first reversing valve 304; the first reversing valve 304 is electrically connected to the main control module 1.

[0048] During normal pickling, the first reversing valve 304 connects each cavity 303 with the circulating liquid supply system 4, and the circulating liquid supply system 4 transports the pickling liquid to the spray body 301 for spraying. When it is necessary to clear the blocked nozzle 302, the corresponding first reversing valve 304 connects the corresponding cavity 303 with the clearing system 8, so that the clearing system 8 clears the blocked nozzle 302.

[0049] By setting up mutually isolated cavities 303, each row of nozzles 302 is connected to each cavity 303 respectively. When only some nozzles 302 are blocked, only the corresponding cavity 303 and the clearing system 8 can be connected to clear some nozzles 302. Compared with the method of clearing all nozzles 302 at the same time, under the condition of certain performance of the clearing system 8, the clearing force is more concentrated, so the clearing efficiency is higher, and the impact on the pickling efficiency of the steel strip 90 is smaller (due to the higher clearing efficiency, even if the shutdown clearing method is adopted, the downtime is shorter, so the impact on the pickling efficiency of the steel strip 90 is smaller). In addition, when only some nozzles 302 are pickled and cleared, more clean pickling liquid can be saved, so that the storage capacity of the clean pickling liquid of the pickling and clearing device 802 is required to be smaller.

[0050] In some preferred embodiments, see Figure 1 The vacuum clearing device 801 includes a vacuum tank 8011 and a vacuum pump 8012 for evacuating the vacuum tank 8011 . The vacuum tank 8011 is connected to each first reversing valve 304 through a pipeline; the vacuum pump 8012 is electrically connected to the main control module 1 .

[0051] In fact, the vacuum clearing device 801 may not be provided with a vacuum tank 8011, and the vacuum pump 8012 may directly provide suction force to the spray device 3, but it needs to go through a process of gradually increasing the suction force to reach a sufficiently large suction force to clear the loose blockage, resulting in a longer vacuum suction clearing time. Figure 1 The vacuum unblocking device 801 can evacuate the vacuum tank 8011 in advance and maintain the vacuum state of the vacuum tank 8011. When unblocking is required, after the first reversing valve 304 connects the vacuum tank 8011 and the cavity 303, it can immediately generate a strong suction force (without going through the process of gradually building up the suction force), which greatly shortens the time of vacuum suction unblocking and improves the unblocking efficiency. Therefore, even if the steel strip 90 does not stop moving during the vacuum suction unblocking process, the impact on the pickling effect is very small. Under the premise of ensuring the pickling effect, online unblocking can be achieved without stopping the machine (when pickling and unblocking are performed subsequently, since a clean pickling liquid is used, the steel strip 90 can be sprayed with pickling while unblocking. Therefore, there is no need to stop the machine for pickling and unblocking. Therefore, as long as the vacuum suction unblocking time is short enough, online unblocking can be performed without stopping the machine without affecting the pickling effect).

[0052] In addition, the vacuum tank 8011 can also serve as a temporary storage for blockages, and discharge the blockages after the blockage is cleared. Therefore, an openable and closable discharge port can be provided on the vacuum tank 8011 to discharge the stored blockages.

[0053] Further, see Figure 1The pickling and unblocking device 802 includes a first storage tank 8021 and a cleaning pump 8022. The first storage tank 8021 is used to store clean pickling liquid. The input end of the cleaning pump 8022 is connected to the first storage tank 8021, and the output end of the cleaning pump 8022 is connected to each first reversing valve 304 through a pipeline; the cleaning pump 8022 is electrically connected to the main control module 1. When pickling and unblocking, the cleaning pump 8022 is started to transport the clean pickling liquid in the first storage tank 8021 to the corresponding cavity 303, so as to flush the nozzle 302 connected to the cavity 303 to dissolve the soluble attachments attached to the inner surface of the nozzle 302. Among them, when pickling and unblocking, pickling and unblocking can be performed according to a preset unblocking time, or pickling and unblocking can be performed continuously until the pickling is no longer insufficient.

[0054] In some embodiments, see Figure 1 The clearing system 8 further includes a second reversing valve 803. The vacuum clearing device 801, the pickling clearing device 802 and each first reversing valve 304 are all connected to the second reversing valve 803 through a pipeline; the second reversing valve 803 is electrically connected to the main control module 1. When vacuum clearing is performed, the second reversing valve 803 connects the vacuum clearing device 801 and the first reversing valve 304. When pickling clearing is performed, the second reversing valve 803 connects the pickling clearing device 802 and the first reversing valve 304.

[0055] In some preferred embodiments, see Figure 2 All the first reversing valves 304 on each spray body 301 are connected to a first main pipe 305 and a second main pipe 306. The first main pipe 305 is connected to the circulating liquid supply system 4, and the second main pipe 306 is used to connect to the clearing system 8 (specifically connected to the second reversing valve 803), thereby simplifying the structure of the connecting pipeline.

[0056] Specifically, see Figure 1 , the circulating liquid supply system 4 includes a second storage tank 401, an infusion pump 402 and a reflux pump 403; the second storage tank 401 is used to store pickling liquid; the input end of the infusion pump 402 is connected to the second storage tank 401, and the output end of the infusion pump 402 is connected to each first reversing valve 304 through a pipeline (for example, connected to the first main pipe 305); the input end of the reflux pump 403 is connected to the pickling tank 2, and the output end of the reflux pump 403 is connected to the second storage tank 401 through a pipeline; the infusion pump 402 and the reflux pump 403 are both electrically connected to the main control module 1. When working, the pickling liquid in the second storage tank 401 is transported to the spray device 3 by the infusion pump 402 to spray pickling on the strip 90, and the pickling liquid falls into the pickling tank 2, and then is pumped back to the second storage tank 401 by the reflux pump 403 to achieve recycling. Among them, a filter can be connected between the reflux pump 403 and the pickling tank 2 to filter impurities in the pickling liquid.

[0057] In some possible implementations, see Figure 1 The first image detection device 9 includes two first cameras 901 and two first irradiation lamps 902. The two first irradiation lamps 902 are respectively used to irradiate the upper and lower surfaces of the steel strip 90 to form a first illumination area. The two first cameras 901 are respectively used to collect images of the upper and lower surfaces of the steel strip 90 including the first illumination area.

[0058] The second image detection device 10 includes two second cameras 1001 and two second irradiation lamps 1002. The two second irradiation lamps 1002 are respectively used to irradiate the upper and lower surfaces of the steel strip 90 to form a second illumination area. The two second cameras 1001 are respectively used to collect images of the upper and lower surfaces of the steel strip 90 including the second illumination area.

[0059] By irradiating the steel strip 90 with an irradiation lamp and collecting the surface image of the steel strip 90 at the same time, the clarity of the image can be improved, and the interference of external ambient light can be reduced, thereby improving the accuracy of the detection result.

[0060] Preferably, the first illumination area and the second illumination area are both strip-shaped areas extending in the left-right direction. The size of the strip-shaped area in the front-to-back direction is larger than the size in the left-to-right direction. When performing image recognition, only the degree of oxidation in the strip-shaped area can be recognized, which reduces the amount of data processing during image recognition and improves recognition efficiency.

[0061] Among them, in order to make the first lighting area and the second lighting area into strip-shaped areas, the first lighting lamp 902 and the second lighting lamp 1002 can both include a light strip extending in the left-right direction and a focusing reflector extending in the left-right direction. The focusing reflector is arranged on the side of the light strip facing away from the steel strip 90, and is used to focus the light emitted by the light strip on the steel strip 90 to form a strip-shaped lighting area.

[0062] The conveying device 7 is a roller transmission device, but is not limited thereto.

[0063] Among them, the cleaning device 5 and the drying device 6 are prior arts and will not be described in detail here.

[0064] refer to Figure 5 The present application provides a control method of the strip pickling monitoring system as described above, which is applied to the main control module 1 of the strip pickling monitoring system, and comprises the steps of:

[0065] A1. Acquire a first image captured in real time by the first image detection device 9 and a second image captured in real time by the second image detection device 10;

[0066] A2. Compare the first image and the second image to determine whether there is a poor area on the surface of the steel strip 90 due to insufficient pickling (ie, the poor area is referred to as the poor area);

[0067] A3. If there is a defective area, each column of nozzles 302 whose row position (ie, position in the left-right direction) falls into the defective area is regarded as a blocked nozzle, and the blocked nozzle is cleared by the clearing system 8 .

[0068] The first image detection device 9 and the second image detection device 10 will synchronously and continuously capture the first image and the second image in real time at the same preset frequency (set according to actual needs).

[0069] Wherein, step A2 comprises:

[0070] A201. Extract the second image collected within a preset time period (which can be set according to actual needs) with the current moment as the end node as the target second image;

[0071] A202. According to the moving speed of the strip 90 and the path distance between the first image detection device 9 and the second image detection device 10, determining the target first image corresponding to the target second image;

[0072] A203. Identify the oxidation degree of the first illumination area of ​​each target first image, to generate a curve of oxidation degree varying with row position, recorded as the first oxidation degree curve; and identify the oxidation degree of the second illumination area of ​​each target second image, to generate a curve of oxidation degree varying with row position, recorded as the second oxidation degree curve; that is, the abscissa of the first oxidation degree curve and the second oxidation degree curve is the row position (i.e., the position in the left-right direction), and the ordinate is the oxidation degree;

[0073] A204. According to the row position of each column of nozzles 302 (which is a known quantity and can be measured in advance), the first oxidation degree curve of each target first image and the second oxidation degree curve of each target second image, a curve of the pickling rate corresponding to each column of nozzles 302 changing with time is generated, which is recorded as a pickling rate curve; that is, the abscissa of the pickling rate curve is time, and the ordinate is the pickling rate; the pickling rate is the ratio of the difference between the oxidation degree before pickling and the oxidation degree after pickling at the same row position to the oxidation degree before pickling, which is equal to the difference between the ordinate value of the first oxidation degree curve and the ordinate value of the second oxidation degree curve at the same row position divided by the ordinate value of the first oxidation degree curve (for example, assuming that the row position of the point a is a, the ordinate value in the first oxidation degree curve is P1, and the ordinate value in the second oxidation degree curve is P2, then the pickling rate r of point a is r=(P1-P2) / P1);

[0074] A205. Calculate the proportion of the time when the pickling rate is lower than the preset pickling rate threshold (which can be set according to actual needs) in the pickling rate curve of each column of nozzles 302 in the preset time period, which is recorded as the first proportion;

[0075] A206. If the first proportion corresponding to at least one column of nozzles 302 is higher than a preset proportion threshold (which can be set according to actual needs), it is determined that there are poor areas on the surface of the steel strip 90 due to insufficient pickling; otherwise, it is determined that there are no poor areas on the surface of the steel strip 90 due to insufficient pickling.

[0076] The moving speed of the steel strip 90 is a preset speed, and the path distance between the first image detection device 9 and the second image detection device 10, that is, the distance traveled by a point on the steel strip 90 from the shooting position of the first image detection device 9 to the shooting position of the second image detection device 10, can be measured in advance. In step A202, the time deviation is first calculated according to the following formula: △t=L / v, △t is the time deviation, L is the path distance between the first image detection device 9 and the second image detection device 10, and v is the moving speed of the steel strip 90; then, according to the acquisition time t of the target second image, the first image with the acquisition time t-△t is used as the target first image corresponding to the target second image.

[0077] In step A203, the oxidation degree of the first illumination area of ​​each target first image is identified to generate a curve of oxidation degree varying with the row position, which is recorded as the first oxidation degree curve, including the following steps performed for each target first image:

[0078] Extracting a first illumination area image of a first image of a target;

[0079] Divide the first illumination area image into a plurality of first segmented areas along the row direction (i.e., the left and right direction) (the number of segmented areas can be set according to actual needs);

[0080] Identify the average oxidation degree of each first segmented area by an image recognition method (the existing oxidation degree recognition method may be used for recognition, such as recognition by color, but not limited thereto);

[0081] A first oxidation degree curve is obtained by fitting according to the row-direction position of the center point of each first segmented area and the average oxidation degree.

[0082] Similarly, in step A203, the oxidation degree of the second illumination area of ​​each target second image is identified to generate a curve of oxidation degree varying with row position, which is recorded as a second oxidation degree curve, including the following steps performed for each target second image:

[0083] Extracting a second illumination area image of the target second image;

[0084] Divide the second illumination area image into a plurality of second segmented areas along the row direction (i.e., the left and right direction) (the number of segmented areas can be set according to actual needs);

[0085] Identify the average oxidation degree of each second segmented area by an image recognition method (the existing oxidation degree recognition method may be used for recognition, such as recognition by color, but not limited thereto);

[0086] A second oxidation degree curve is obtained by fitting according to the row position of the center point of each second segmented area and the average oxidation degree.

[0087] Wherein, step A204 includes:

[0088] Extracting the oxidation degree corresponding to the row position of each column of nozzles 302 from the first oxidation degree curve of each target first image, and recording it as the first oxidation degree;

[0089] Extracting the oxidation degree corresponding to the row position of each column of nozzles 302 from the second oxidation degree curve of each target second image, and recording it as the second oxidation degree;

[0090] The pickling rate corresponding to each row of nozzles 302 is calculated according to the following formula:

[0091] r(i,j)=(P1(i,j)-P2(i,j)) / P1(i,j);

[0092] Wherein, r(i, j) is the pickling rate of the i-th column nozzle 302 corresponding to the j-th target first image and the j-th target second image, P1(i, j) is the first oxidation degree of the i-th column nozzle 302 corresponding to the j-th target first image, and P2(i, j) is the second oxidation degree of the i-th column nozzle 302 corresponding to the j-th target second image;

[0093] According to the pickling rates of each column of nozzles 302 corresponding to each target first image and each target second image and the acquisition time of each target first image and each target second image, the pickling rate curve of each column of nozzles 302 is obtained by fitting.

[0094] In step A3, each column of nozzles 302 whose first proportion is higher than a preset proportion threshold is regarded as a blocked nozzle.

[0095] Further, in step A3, clearing the blocked nozzle by using the clearing system 8 includes:

[0096] Control the first reversing valve 304 corresponding to the blocked nozzle to connect the corresponding cavity 303 and the clearing system 8;

[0097] The vacuum clearing device 801 is used to vacuum the cavity 303 corresponding to the blocked nozzle;

[0098] After the vacuum suction is completed, the pickling and unblocking device 802 is used to deliver clean pickling liquid to the cavity 303 corresponding to the blocked nozzle.

[0099] Among them, a pressure sensor can be set on the vacuum tank 8011, and the vacuum tank 8011 can be evacuated in advance. When vacuum suction is performed, the pressure of the vacuum tank 8011 can be detected in real time by using the pressure sensor. When a sudden pressure change is detected (for example, the pressure change rate can be obtained by taking the derivative of the measured pressure with respect to time, and when the pressure change rate is greater than a preset change rate threshold, it is determined that the pressure has suddenly changed), the vacuum suction is terminated.

[0100] When the pickling and unblocking device 802 is used to deliver clean pickling liquid to the cavity 303 corresponding to the blocked nozzle, the delivery of the clean pickling liquid can be stopped when at least one of the following conditions is met, and the corresponding first reversing valve 304 is controlled to connect the corresponding cavity 303 and the circulating liquid supply system 4:

[0101] Condition 1: The duration of delivering clean pickling liquid reaches the preset clearing time (set according to actual needs);

[0102] Condition 2: The duration of detecting that there is no insufficiently pickled defective area on the surface of the steel strip 90 reaches a preset duration threshold (set according to actual needs).

[0103] In some preferred embodiments, while using the vacuum clearing device 801 to perform vacuum suction on the cavity 303 corresponding to the blocked nozzle, and using the pickling clearing device 802 to deliver clean pickling liquid to the cavity 303 corresponding to the blocked nozzle, the strip steel 90 is kept moving for pickling treatment to achieve online clearing without stopping the machine.

[0104] In this document, relational terms such as first and second, etc. are used merely to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0105] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A steel strip pickling monitoring system, comprising a main control module (1), a pickling tank (2), a spray device (3) arranged in the pickling tank (2), a circulating liquid supply system (4), a cleaning device (5), a drying device (6) and a conveying device (7), wherein the conveying device (7) is used to sequentially convey the steel strip (90) to the pickling tank (2), the cleaning device (5) and the drying device (6), the circulating liquid supply system (4) is used to provide pickling liquid to the spray device (3), the spray device (3) is used to spray the pickling liquid onto the steel strip (90) for pickling, the cleaning device (5) is used to clean the steel strip (90) after pickling, and the drying device (6) is used to dry the cleaned steel strip (90); characterized in that: It also includes a blockage clearing system (8), a first image detection device (9) and a second image detection device (10); The first image detection device (9) is arranged upstream of the pickling tank (2) and is used to collect a surface image of the steel strip (90); the second image detection device (10) is arranged downstream of the drying device (6) and is used to collect a surface image of the steel strip (90); The clearing system (8) is in communication with the spray device (3), and comprises a vacuum clearing device (801) and a pickling clearing device (802); the vacuum clearing device (801) is used to preliminarily clear the blockage at the nozzle (302) of the spray device (3) by vacuum suction, and the pickling clearing device (802) is used to further clear the blockage at the nozzle (302) of the spray device (3) by using clean pickling liquid; The main control module (1) is electrically connected to the circulating liquid supply system (4), the clearing system (8), the first image detection device (9) and the second image detection device (10), and is used to compare the images captured by the first image detection device (9) and the second image detection device (10) to detect whether the nozzle (302) of the spray device (3) is blocked, and to control the clearing system (8) to clear the nozzle (302) of the spray device (3) when blocked; The spray device (3) comprises two spray bodies (301) disposed vertically opposite to each other; a gap is provided between the two spray bodies (301) for the steel strip (90) to pass through; a plurality of nozzles (302) distributed in a matrix are arranged on opposite sides of the two spray bodies (301); the row direction of the matrix is ​​parallel to the left-right direction, and the column direction is parallel to the front-back direction; The spray body (301) is provided with a plurality of cavities (303) arranged in the left-right direction and isolated from each other, each of the cavities (303) extending in the front-back direction; each row of the nozzles (302) is respectively connected to each of the cavities (303); each of the cavities (303) is respectively connected to the circulating liquid supply system (4) and the clearing system (8) via an independent first reversing valve (304); the first reversing valve (304) is electrically connected to the main control module (1); When the main control module (1) compares the images captured by the first image detection device (9) and the second image detection device (10) to detect whether the nozzle (302) of the spray device (3) is blocked, it first calculates the time deviation according to the following formula: △t=L / v, where △t is the time deviation, L is the path distance between the first image detection device (9) and the second image detection device (10), that is, the distance traveled by the point on the steel strip (90) from the shooting position of the first image detection device (9) to the shooting position of the second image detection device (10), and v is the moving speed of the steel strip (90); then, according to the acquisition time t of the target second image, the first image with the acquisition time t-△t is used as the target first image corresponding to the target second image for comparison with the target second image; the target second image is the image captured by the second image detection device (10), and the first image is the image captured by the first image detection device (9).

2. The strip pickling monitoring system according to claim 1 is characterized in that: The vacuum clearing device (801) comprises a vacuum tank (8011) and a vacuum pump (8012) for evacuating the vacuum tank (8011); the vacuum tank (8011) is connected to each of the first reversing valves (304) via a pipeline; and the vacuum pump (8012) is electrically connected to the main control module (1).

3. The strip pickling monitoring system according to claim 1 is characterized in that: The pickling and clearing device (802) comprises a first storage tank (8021) and a cleaning pump (8022); the first storage tank (8021) is used to store clean pickling liquid; the input end of the cleaning pump (8022) is connected to the first storage tank (8021); the output end of the cleaning pump (8022) is connected to each of the first reversing valves (304) via a pipeline; the cleaning pump (8022) is electrically connected to the main control module (1).

4. The strip pickling monitoring system according to claim 1 is characterized in that: The blockage clearing system (8) further comprises a second reversing valve (803); the vacuum blockage clearing device (801), the pickling blockage clearing device (802) and each of the first reversing valves (304) are connected to the second reversing valve (803) via a pipeline; and the second reversing valve (803) is electrically connected to the main control module (1).

5. The strip pickling monitoring system according to claim 1, characterized in that: The circulating liquid supply system (4) comprises a second storage tank (401), an infusion pump (402) and a reflux pump (403); the second storage tank (401) is used to store pickling liquid; the input end of the infusion pump (402) is connected to the second storage tank (401), and the output end of the infusion pump (402) is connected to each of the first reversing valves (304) through a pipeline; the input end of the reflux pump (403) is connected to the pickling tank (2), and the output end of the reflux pump (403) is connected to the second storage tank (401) through a pipeline; the infusion pump (402) and the reflux pump (403) are both electrically connected to the main control module (1).

6. The strip pickling monitoring system according to claim 1, characterized in that: The first image detection device (9) comprises two first cameras (901) and two first irradiation lamps (902), the two first irradiation lamps (902) being respectively used to irradiate the upper and lower surfaces of the steel strip (90) to form a first illumination area, and the two first cameras (901) being respectively used to collect images of the upper and lower surfaces of the steel strip (90) including the first illumination area; The second image detection device (10) comprises two second cameras (1001) and two second irradiation lamps (1002), the two second irradiation lamps (1002) being respectively used to irradiate the upper and lower surfaces of the steel strip (90) to form a second illumination area, and the two second cameras (1001) being respectively used to capture images of the upper and lower surfaces of the steel strip (90) including the second illumination area.

7. The strip pickling monitoring system according to claim 6 is characterized in that: The first lighting area and the second lighting area are both strip-shaped areas extending in the left-right direction.

8. A control method for a strip pickling monitoring system according to any one of claims 1 to 7, characterized in that: The main control module (1) applied to the strip pickling monitoring system comprises the following steps: A1. Acquire a first image acquired in real time by the first image detection device (9) and a second image acquired in real time by the second image detection device (10); A2. comparing the first image and the second image to determine whether there is a poor area on the surface of the steel strip (90) due to insufficient pickling; A3. If a defective area exists, the nozzles (302) in each column whose row position falls into the defective area are regarded as blocked nozzles, and the blocked nozzles are cleared by using the clearing system (8).

9. The control method according to claim 8, characterized in that: In step A3, using the clearing system (8) to clear the blocked nozzle includes: Controlling the first reversing valve (304) corresponding to the blocking nozzle to connect the corresponding cavity (303) and the blocking clearing system (8); Using the vacuum clearing device (801) to perform vacuum suction on the cavity (303) corresponding to the blocked nozzle; After the vacuum suction is completed, the pickling and unblocking device (802) is used to transport clean pickling liquid to the cavity (303) corresponding to the blocked nozzle.

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