Metal strip degreasing production line online control system and method

Abstract

The invention relates to the technical field of metal strip degreasing production line on-line control, and particularly discloses a metal strip degreasing production line on-line control system and method, and the system comprises a degreasing state judgment module, a degreasing information collection module, a degreasing incomplete analysis module, a degreasing excessive analysis module, a database, and a production line degreasing effect feedback module. According to the method, the reason for incomplete degreasing is determined by judging the degreasing state corresponding to the target metal strip, the corresponding control scheme is matched according to the reason for incomplete degreasing, meanwhile, when the degreasing state is excessive degreasing, the PH value corresponding to the degreasing fluid in the degreasing tank in next batch of degreasing is adjusted, and the degreasing efficiency is improved. And finally, whether the degreasing effect corresponding to the target production line has a problem or not is judged, the overall performance of the product is improved, the service life of the product is prolonged, meanwhile, the problem can be accurately positioned, a clear direction is provided for subsequent control measures, and production stability and product quality consistency are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of online control of a metal strip degreasing production line, and relates to an online control system and method for a metal strip degreasing production line. Background Art

[0002] During the processing of metal strips, degreasing is often required to remove surface oil and improve the quality of subsequent processing. Traditional degreasing production line control systems mostly rely on manual operation and simple automatic control, which have problems such as low control accuracy, low production efficiency, and high energy consumption. Therefore, it is particularly important to develop a degreasing production line control system that can be monitored online in real time and automatically adjusted.

[0003] For example, the patent with publication number CN112191607A discloses a degreasing tank device and a degreasing method for degreasing metal pipes, including: placing a degreasing solution in the degreasing tank, turning on the heater to heat the degreasing solution; starting the pump body and the ultrasonic generator, placing the metal pipe to be degreased on the material rack, immersing it in the degreasing solution, and the ultrasonic vibration generated by the ultrasonic generator accelerates the grease to separate from the outer surface and inner hole of the metal pipe, and the flowing degreasing solution accelerates the grease to separate from the outer surface and inner hole of the metal pipe and takes the grease away in time; after degreasing, the metal pipe is hoisted out and blown dry with high-pressure air. The present invention uses a flowing and heated degreasing solution in combination with ultrasonic vibration, so that the degreasing effect is good and the efficiency is high.

[0004] The above existing technologies still have the following problems: 1. The degreasing state of the metal strip is not judged, and thus the degreasing condition is not deeply analyzed from the perspective of the corresponding degreasing states of the metal strip, which may lead to incomplete degreasing or excessive degreasing, thereby affecting the quality of subsequent processes such as coating, electroplating or welding, and ultimately reducing the overall performance and service life of the product.

[0005] 2. No comprehensive analysis was conducted on the overall degreasing effect of the degreasing production line, and the changes in the overall degreasing effect of the degreasing production line could not be intuitively displayed. At the same time, no analysis and feedback was provided on the possible causes of changes in the overall degreasing effect, which reduced the timeliness of relevant personnel in discovering the abnormal causes of the degreasing production line, thereby reducing the degreasing efficiency of the degreasing production line, which not only wasted time and resources, but also increased production costs. Summary of the invention

[0006] In view of this, in order to solve the problems raised in the above background technology, an online control system and method for a metal strip degreasing production line is proposed.

[0007] The objectives of the present invention can be achieved through the following technical solutions: In the first aspect, the present invention provides an online control system for a metal strip degreasing production line, including: a degreasing status judgment module, which is used to record the metal strip degreasing production line in the target factory as the target production line, collect the surface grayscale image of the target metal strip in the current batch of degreasing after degreasing is completed, and judge the degreasing status of the target metal strip in the current batch of degreasing, wherein the degreasing status includes complete degreasing, incomplete degreasing and excessive degreasing.

[0008] The degreasing information collection module is used to collect the set temperature, pH value and temperature at each monitoring time point corresponding to the degreasing liquid in the degreasing tank in the current batch of degreasing, extract the set transmission speed of the conveyor belt where the target metal strip is located, and collect the set residence time and actual residence time of the target metal strip in the degreasing tank.

[0009] The incomplete degreasing analysis module is used to confirm the cause of incomplete degreasing of the target metal strip when the degreasing state is incomplete degreasing, and match the corresponding control plan according to the cause of incomplete degreasing.

[0010] The over-degreasing analysis module is used to adjust the pH value corresponding to the degreasing liquid in the degreasing tank in the next batch of degreasing when the degreasing state is over-degreasing.

[0011] The database is used to store the gray value interval corresponding to the dirt on the surface of the metal strip, the gray value interval corresponding to the white spot on the surface of the metal strip, the required compensation temperature corresponding to the unit temperature control deviation, the required compensation speed corresponding to the unit residence time control deviation, and the required reduction of pH value corresponding to each degreasing over-index.

[0012] The production line degreasing effect feedback module is used to extract the surface grayscale images of the metal strips in the target production line after degreasing is completed in each historical batch of degreasing, and to determine whether there is a problem with the degreasing effect of the target production line. If there is a problem, the image corresponding to the degreasing liquid in the degreasing tank is collected to obtain the image information corresponding to the degreasing liquid in the degreasing tank, confirm the cause of the problem with the degreasing effect of the target production line, and provide feedback.

[0013] The second aspect of the present invention provides an online control method for a metal strip degreasing production line, comprising: S1, degreasing status judgment: recording the metal strip degreasing production line in the target factory as the target production line, collecting the surface grayscale image of the target metal strip corresponding to the degreasing of the target production line in the current batch of degreasing, and judging the degreasing status corresponding to the target metal strip in the current batch of degreasing, wherein the degreasing status includes thorough degreasing, incomplete degreasing and excessive degreasing.

[0014] S2. Degreasing information collection: collect the set temperature, pH value and temperature at each monitoring time point corresponding to the degreasing liquid in the degreasing tank in the current batch of degreasing, extract the set transmission speed of the conveyor belt where the target metal strip is located, and collect the set residence time and actual residence time of the target metal strip in the degreasing tank.

[0015] S3. Analysis of incomplete degreasing: When the degreasing status is incomplete degreasing, confirm the reason why the target metal strip is not degreased completely, and match the corresponding control plan according to the reason why the degreasing is not complete.

[0016] S4. Over-degreasing analysis: When the degreasing state is over-degreasing, the pH value of the degreasing liquid in the degreasing tank in the next batch of degreasing is adjusted.

[0017] S5. Feedback on degreasing effect of production line: Extract the surface grayscale images of metal strips in each batch of historical degreasing of the target production line after degreasing is completed, and determine whether there is a problem with the degreasing effect of the target production line. If there is a problem, collect the image corresponding to the degreasing liquid in the degreasing tank, confirm the cause of the problem with the degreasing effect of the target production line, and provide feedback.

[0018] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects: (1) The present invention determines the degreasing status of the target metal strip in the current batch of degreasing by combining the surface grayscale image of the target metal strip in the target production line after degreasing is completed, thereby avoiding incomplete degreasing or excessive degreasing that affects the quality of subsequent processes such as coating, electroplating or welding, and improving the overall performance and service life of the product.

[0019] (2) The present invention can accurately locate the problem by confirming the reason why the target metal strip is not completely degreased when the degreasing state is incomplete degreasing, and matching the corresponding control scheme according to the reason why the degreasing is not complete, so as to provide a clear direction for subsequent control measures and improve production stability and product quality consistency.

[0020] (3) The present invention can reduce the alkalinity of the degreasing liquid by adjusting the pH value of the degreasing liquid in the degreasing tank in the next batch of degreasing when the degreasing state is excessive, thereby avoiding the problem of incomplete removal of grease on the surface of the metal strip due to excessive alkalinity in the next batch of degreasing, reducing corrosion on the surface of the metal strip and protecting its surface integrity.

[0021] (4) The present invention determines whether there is a problem with the degreasing effect corresponding to the target production line. If there is a problem, the present invention confirms the cause of the problem in the degreasing effect corresponding to the target production line in combination with the image information corresponding to the degreasing liquid in the degreasing tank, and provides feedback, thereby intuitively displaying the changes in the overall degreasing effect of the degreasing production line. At the same time, the present invention improves the timeliness of relevant personnel in discovering the cause of abnormalities in the degreasing production line, improves the degreasing efficiency of the degreasing production line, avoids wasting time and resources, and reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the system structure connection of the present invention.

[0024] Figure 2 It is a schematic diagram of the method steps of the present invention. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figure 1 As shown, the first aspect of the present invention provides an online control system for a metal strip degreasing production line, comprising: a degreasing status judgment module, a degreasing information collection module, an incomplete degreasing analysis module, an excessive degreasing analysis module, a database and a production line degreasing effect feedback module.

[0027] The incomplete degreasing analysis module and the excessive degreasing analysis module are both connected to the degreasing information collection module, the incomplete degreasing analysis module, the excessive degreasing analysis module and the production line degreasing effect feedback module are all connected to the degreasing state judgment module, and the degreasing state judgment module, the incomplete degreasing analysis module and the excessive degreasing analysis module are all connected to the database.

[0028] The degreasing status judgment module is used to record the metal strip degreasing production line in the target factory as the target production line, collect the surface grayscale image of the target metal strip in the current batch of degreasing after the degreasing is completed, and judge the degreasing status of the target metal strip in the current batch of degreasing, wherein the degreasing status includes complete degreasing, incomplete degreasing and excessive degreasing.

[0029] It should be noted that the method for collecting the surface grayscale image of the target metal strip after degreasing is as follows: the surface image of the target metal strip after degreasing is collected by an installed high-definition camera, the collected surface image is imported into specific image processing software, and the surface grayscale image of the target metal strip after degreasing is obtained after processing by the image processing software.

[0030] In a specific embodiment of the present invention, the specific process of judging the degreasing status of the target metal strip in the current batch of degreasing is: locating the grayscale value corresponding to each grayscale area from the surface grayscale image of the target metal strip after degreasing is completed, and comparing it with the grayscale value interval corresponding to the dirt on the surface of the metal strip stored in the database; if the grayscale value corresponding to a grayscale area is within the grayscale value interval corresponding to the dirt on the surface of the metal strip, the grayscale area is recorded as a dirt area.

[0031] The grayscale values ​​corresponding to each grayscale area of ​​the target metal strip after degreasing are compared with the grayscale value interval corresponding to the white spots on the surface of the metal strip stored in the database. If the grayscale value corresponding to a grayscale area is within the grayscale value interval corresponding to the white spots on the surface of the metal strip, the grayscale area is recorded as a white spot area.

[0032] If there are no dirt areas and white spot areas on the surface of the target metal strip after the degreasing is completed, it is determined that the degreasing state of the target metal strip is complete degreasing.

[0033] If there is a dirt area on the surface of the target metal strip after the degreasing is completed, it is determined that the degreasing state of the target metal strip is incomplete degreasing.

[0034] If white spots exist on the surface of the target metal strip after degreasing, it is determined that the degreasing state of the target metal strip is over-degreasing.

[0035] The embodiment of the present invention judges the degreasing state of the target metal strip in the current batch of degreasing by combining the surface grayscale image of the target metal strip in the target production line after degreasing is completed, thereby avoiding incomplete degreasing or excessive degreasing that affects the quality of subsequent processes such as coating, electroplating or welding, and improving the overall performance and service life of the product.

[0036] The degreasing information collection module is used to collect the set temperature, pH value and temperature at each monitoring time point corresponding to the degreasing liquid in the degreasing tank in the current batch of degreasing, extract the set transmission speed of the conveyor belt where the target metal strip is located, and collect the set residence time and actual residence time of the target metal strip in the degreasing tank.

[0037] It should be noted that the pH value corresponding to the degreasing liquid and the temperature at each monitoring time point are collected by a pH meter and a thermometer respectively, and the set temperature corresponding to the degreasing liquid, the set transmission speed of the conveyor belt where the target metal strip is located, and the actual residence time of the target metal strip in the degreasing tank are collected from the control panel corresponding to the target production line respectively.

[0038] It should also be noted that the actual residence time of the target metal strip in the degreasing tank is collected by installing timers at the entrance and exit of the degreasing tank, and when the metal strip enters the degreasing tank, the timer at the entrance starts timing. When the metal strip leaves the degreasing tank, the timer at the exit stops timing, so that the residence time of the metal strip in the degreasing tank can be directly obtained.

[0039] The incomplete degreasing analysis module is used to confirm the reason for incomplete degreasing of the target metal strip when the degreasing state is incomplete degreasing, and match the corresponding control scheme according to the reason for incomplete degreasing.

[0040] In a specific embodiment of the present invention, the specific process of confirming the reason why the target metal strip is not thoroughly degreased is: based on the set temperature corresponding to the degreasing liquid in the degreasing tank in the current batch of degreasing and the temperature at each monitoring time point, calculate the temperature control qualification degree ψ corresponding to the degreasing liquid in the degreasing tank.

[0041] It should be noted that the specific process of calculating the temperature control qualification of the degreasing liquid in the degreasing tank is as follows: subtract the temperature of the degreasing liquid in the degreasing tank in the current batch of degreasing at each monitoring time point from the set temperature to obtain the temperature deviation of the degreasing liquid in the degreasing tank in the current batch of degreasing at each monitoring time point, and calculate the average value thereof to obtain the average temperature deviation of the degreasing liquid in the degreasing tank in the current batch of degreasing, recorded as

[0043] Calculate the temperature control qualification ψ corresponding to the degreasing liquid in the degreasing tank, Here, ΔW′ represents the temperature deviation of the set reference.

[0044] Calculate the target metal strip's residence time control qualification based on the set residence time and actual residence time of the target metal strip in the degreasing tank

[0045] It should be noted that the specific process of calculating the residence time control qualification of the target metal strip is: subtracting the set residence time and the actual residence time of the target metal strip in the degreasing tank to obtain the residence time deviation of the target metal strip in the degreasing tank, and record it as ΔT.

[0046] Calculate the residence time control qualification of the target metal strip Here, ΔT′ represents the deviation of the dwell time length of the setting reference.

[0047] A diagnosis model for the incomplete degreasing cause of the target metal strip is established, and the cause of the incomplete degreasing is output, wherein the diagnosis model for the incomplete degreasing cause is expressed as: Among them, P1 and P2 represent the evaluation conditions of each reason for incomplete degreasing, P1 means ψ<ψ′, P2 means Among them, ψ′ and They respectively represent the temperature control pass rate and residence time control pass rate of the set reference.

[0048] In a specific embodiment of the present invention, the specific process of matching the corresponding control scheme according to the reason for incomplete degreasing is as follows: if the reason for incomplete degreasing of the target metal strip is unqualified temperature control, the set temperature corresponding to the degreasing liquid in the degreasing tank is recorded as W 设 , extract the required compensation temperature corresponding to the unit temperature control deviation from the database and record it as W0, and set the set temperature W corresponding to the degreasing liquid in the degreasing tank in the next batch of degreasing 下 , W 下 =W 设 +(ψ′-ψ)*W0, where ψ′ represents the temperature control pass rate of the set reference.

[0049] If the degreasing of the target metal strip is not thorough due to unqualified residence time control, the set transmission speed of the conveyor belt where the target metal strip is located is recorded as v 设 , extract the required compensation speed corresponding to the unit residence time control deviation from the database and record it as v0, and set the set transmission speed v of the conveyor belt in the next batch of degreasing 下 , in, Indicates the control pass rate of the set reference residence time.

[0050] The embodiment of the present invention can accurately locate the problem by confirming the reason why the target metal strip is not completely degreased when the degreasing state is incomplete degreasing, and matching the corresponding control scheme according to the reason why the degreasing is not complete, so as to provide a clear direction for subsequent control measures and improve production stability and product quality consistency.

[0051] The over-degreasing analysis module is used to adjust the pH value corresponding to the degreasing liquid in the degreasing tank in the next batch of degreasing when the degreasing state is over-degreasing.

[0052] In a specific embodiment of the present invention, the specific process of adjusting the pH value of the degreasing liquid in the degreasing tank in the next batch of degreasing is as follows: the pH value of the degreasing liquid in the degreasing tank in the current batch of degreasing is recorded as ε 当 .

[0053] The number of white spot areas of the target metal strip after degreasing is completed is counted, and the white spot area corresponding to each white spot area is located, and the degreasing excess index β corresponding to the target metal strip is calculated.

[0054] In a specific embodiment of the present invention, the specific process of calculating the degreasing excess index corresponding to the target metal strip is: the number of white spot areas corresponding to the target metal strip after degreasing is completed is recorded as τ.

[0055] The white spot areas corresponding to the white spot regions of the target metal strip after degreasing are accumulated to obtain the total white spot area of ​​the target metal strip after degreasing, which is recorded as S.

[0056] Calculate the degreasing excess index β corresponding to the target metal strip, Wherein, τ′ and S′ represent the number of white spot regions and the white spot area of ​​the set reference, respectively, and e represents a natural constant.

[0057] Compare the degreasing over-index corresponding to the target metal strip with the required pH value reduction corresponding to each degreasing over-index stored in the database to obtain the required pH value reduction of the degreasing liquid, which is recorded as ε 降 .

[0058] Set the pH value of the degreasing liquid in the degreasing tank for the next batch of degreasing. 下 , ε 下 =ε 当 -ε 降 .

[0059] The embodiment of the present invention can reduce the alkalinity strength of the degreasing liquid by adjusting the pH value of the degreasing liquid in the degreasing tank in the next batch of degreasing when the degreasing state is over-degreasing, thereby avoiding the problem of incomplete removal of grease on the surface of the metal strip due to excessive alkalinity in the next batch of degreasing, reducing corrosion on the surface of the metal strip and protecting its surface integrity.

[0060] The database is used to store the grayscale value intervals corresponding to the dirt on the surface of the metal strip, store the grayscale value intervals corresponding to the white spots on the surface of the metal strip, store the required compensation temperature corresponding to the unit temperature control deviation, store the required compensation speed corresponding to the unit residence time control deviation, and store the required reduction in pH value corresponding to each degreasing over-index.

[0061] Table 1 shows the data sources in the database of this embodiment.

[0062]

[0063]

[0064] The production line degreasing effect feedback module is used to extract the surface grayscale images of the metal strips in the target production line after degreasing is completed in each historical batch of degreasing, and judge whether there is a problem with the degreasing effect of the target production line. If there is a problem, the image corresponding to the degreasing liquid in the degreasing tank is collected to obtain the image information corresponding to the degreasing liquid in the degreasing tank, confirm the reason for the problem with the degreasing effect of the target production line, and provide feedback.

[0065] It should be noted that the ultraviolet fluorescence detection device emits specific ultraviolet light, and the sediment molecules in the degreasing liquid absorb the light energy and then undergo transition and release specific light. By detecting these lights, the sediment situation of the degreasing liquid can be known, and it may be presented in the form of images or data. Although this is not a direct image of the liquid, it provides a visual way to detect sediment.

[0066] In a specific embodiment of the present invention, the specific process of judging whether there is a problem with the degreasing effect corresponding to the target production line is: based on the surface grayscale image of the metal strip corresponding to the degreasing of the target production line in each historical batch of degreasing, the degreasing state of the metal strip in each historical batch of degreasing is judged in the same way as the judgment method of the degreasing state of the target metal strip in the current batch of degreasing, and the number of times the degreasing state is completely degreased is counted.

[0067] Calculate the degreasing effect evaluation index χ corresponding to the target production line.

[0068] It should be noted that the specific process of calculating the degreasing effect evaluation index corresponding to the target production line is: the number of times the degreasing state of the metal strip corresponding to the target production line after degreasing is completed in the historical batch degreasing is recorded as σ.

[0069] Calculate the degreasing effect evaluation index χ corresponding to the target production line, Here, σ′ represents the reference degreasing frequency.

[0070] The degreasing effect evaluation index corresponding to the target production line is compared with the degreasing effect evaluation index of the set reference. If the degreasing effect evaluation index corresponding to the target production line is greater than or equal to the degreasing effect evaluation index of the set reference, it indicates that there is no problem with the degreasing effect corresponding to the target production line. Otherwise, it indicates that there is a problem with the degreasing effect corresponding to the target production line.

[0071] In a specific embodiment of the present invention, the image information includes the number of sediments and the volume of each sediment.

[0072] In a specific embodiment of the present invention, the specific process of confirming the cause of the problem in the degreasing effect corresponding to the target production line is: extracting the number of sediments and the volume of each sediment from the image information corresponding to the degreasing liquid in the degreasing tank, and calculating the cleanliness ω corresponding to the degreasing liquid in the degreasing tank based on this.

[0073] It should be noted that the specific process of calculating the cleanliness corresponding to the degreasing liquid in the degreasing tank is: the number of sediments corresponding to the degreasing liquid in the degreasing tank is recorded as μ.

[0074] The volumes of the sediments corresponding to the degreasing liquid in the degreasing tank are accumulated to obtain the total sediment volume corresponding to the degreasing liquid in the degreasing tank, which is recorded as V.

[0075] Calculate the cleanliness ω corresponding to the degreasing liquid in the degreasing tank, Wherein, μ′ and V′ represent the number of sediments and the volume of sediments set as the reference, respectively.

[0076] The cleanliness corresponding to the degreasing liquid in the degreasing tank is compared with the cleanliness of the set reference. If the cleanliness corresponding to the degreasing liquid in the degreasing tank is less than the cleanliness of the set reference, the reason why there is a problem with the degreasing effect corresponding to the target production line is the aging of the degreasing liquid. Otherwise, the reason why there is a problem with the degreasing effect corresponding to the target production line is other reasons.

[0077] The embodiment of the present invention determines whether there is a problem with the degreasing effect corresponding to the target production line. If there is a problem, it confirms the cause of the problem with the degreasing effect corresponding to the target production line in combination with the image information corresponding to the degreasing liquid in the degreasing tank, and provides feedback, thereby intuitively displaying the changes in the overall degreasing effect of the degreasing production line. At the same time, it improves the timeliness of relevant personnel in discovering the abnormal causes of the degreasing production line, improves the degreasing efficiency of the degreasing production line, avoids wasting time and resources, and reduces production costs.

[0078] Reference Figure 2As shown, the second aspect of the present invention provides an online control method for a metal strip degreasing production line, including: S1, degreasing status judgment: the metal strip degreasing production line in the target factory is recorded as the target production line, and the surface grayscale image of the target metal strip corresponding to the target production line after degreasing is completed in the current batch of degreasing is collected, and the degreasing status corresponding to the target metal strip in the current batch of degreasing is judged, wherein the degreasing status includes thorough degreasing, incomplete degreasing and excessive degreasing.

[0079] S2. Degreasing information collection: collect the set temperature, pH value and temperature at each monitoring time point corresponding to the degreasing liquid in the degreasing tank in the current batch of degreasing, extract the set transmission speed of the conveyor belt where the target metal strip is located, and collect the set residence time and actual residence time of the target metal strip in the degreasing tank.

[0080] S3. Analysis of incomplete degreasing: When the degreasing status is incomplete degreasing, confirm the reason why the target metal strip is not degreased completely, and match the corresponding control plan according to the reason why the degreasing is not complete.

[0081] S4. Over-degreasing analysis: When the degreasing state is over-degreasing, the pH value of the degreasing liquid in the degreasing tank in the next batch of degreasing is adjusted.

[0082] S5. Feedback on degreasing effect of production line: Extract the surface grayscale images of metal strips in each batch of historical degreasing of the target production line after degreasing is completed, and determine whether there is a problem with the degreasing effect of the target production line. If there is a problem, collect the image corresponding to the degreasing liquid in the degreasing tank, confirm the cause of the problem with the degreasing effect of the target production line, and provide feedback.

[0083] The above contents are merely examples and explanations of the concept of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the present invention, they shall all fall within the protection scope of the present invention.

Claims

1. An online control system for a metal strip degreasing production line, characterized in that: include: A degreasing state judgment module is used to record the metal strip degreasing production line in the target factory as the target production line, collect the surface grayscale image of the target metal strip corresponding to the target production line after degreasing is completed in the current batch of degreasing, and judge the degreasing state corresponding to the target metal strip in the current batch of degreasing, wherein the degreasing state includes complete degreasing, incomplete degreasing and excessive degreasing; The degreasing information collection module is used to collect the set temperature, pH value and temperature at each monitoring time point corresponding to the degreasing liquid in the degreasing tank in the current batch of degreasing, extract the set transmission speed of the conveyor belt where the target metal strip is located, and collect the set residence time and actual residence time of the target metal strip in the degreasing tank; The incomplete degreasing analysis module is used to confirm the reason why the target metal strip is not completely degreased when the degreasing state is incomplete degreasing, and match the corresponding control scheme according to the reason why the degreasing is not completely degreased; The over-degreasing analysis module is used to adjust the pH value of the degreasing liquid in the degreasing tank in the next batch of degreasing when the degreasing state is over-degreasing; A database for storing grayscale value intervals corresponding to dirt on the surface of the metal strip, storing grayscale value intervals corresponding to white spots on the surface of the metal strip, storing required compensation temperatures corresponding to unit temperature control deviations, storing required compensation speeds corresponding to unit dwell time control deviations, and storing required reductions in pH values ​​corresponding to various degreasing over-indexes; The production line degreasing effect feedback module is used to extract the surface grayscale images of the metal strips in the target production line after degreasing is completed in each historical batch of degreasing, and to determine whether there is a problem with the degreasing effect of the target production line. If there is a problem, the image corresponding to the degreasing liquid in the degreasing tank is collected to obtain the image information corresponding to the degreasing liquid in the degreasing tank, confirm the cause of the problem with the degreasing effect of the target production line, and provide feedback.

2. The online control system of a metal strip degreasing production line according to claim 1 is characterized in that: The specific process of determining the degreasing state of the target metal strip in the current batch of degreasing is as follows: The grayscale value corresponding to each grayscale area is located from the grayscale image of the target metal strip after degreasing, and compared with the grayscale value interval corresponding to the dirt on the surface of the metal strip stored in the database. If the grayscale value corresponding to a grayscale area is within the grayscale value interval corresponding to the dirt on the surface of the metal strip, the grayscale area is recorded as a dirt area; Compare the grayscale values ​​corresponding to each grayscale area of ​​the target metal strip after degreasing with the grayscale value interval corresponding to the white spots on the surface of the metal strip stored in the database; if the grayscale value corresponding to a grayscale area is within the grayscale value interval corresponding to the white spots on the surface of the metal strip, then record the grayscale area as a white spot area; If there is no dirt area and white spot area on the surface of the target metal strip after the degreasing is completed, the degreasing state of the target metal strip is determined to be complete degreasing; If there is a dirt area on the surface of the target metal strip after the degreasing is completed, it is determined that the degreasing state of the target metal strip is not completely degreased; If white spots exist on the surface of the target metal strip after degreasing, it is determined that the degreasing state of the target metal strip is over-degreasing.

3. The online control system of a metal strip degreasing production line according to claim 2 is characterized in that: The specific process of confirming the reason why the target metal strip is not completely degreased is as follows: Based on the set temperature corresponding to the degreasing liquid in the degreasing tank in the current batch of degreasing and the temperature at each monitoring time point, calculate the temperature control qualification ψ corresponding to the degreasing liquid in the degreasing tank; Calculate the target metal strip's residence time control qualification based on the set residence time and actual residence time of the target metal strip in the degreasing tank A diagnosis model for the incomplete degreasing cause of the target metal strip is established, and the cause of the incomplete degreasing is output. The diagnosis model for the incomplete degreasing cause is expressed as: Among them, P1 and P2 represent the evaluation conditions of each reason for incomplete degreasing, P1 means ψ<ψ′, P2 means Among them, ψ′ and They respectively represent the temperature control pass rate and residence time control pass rate of the set reference.

4. The online control system of a metal strip degreasing production line according to claim 3 is characterized in that: The specific process of matching the corresponding control scheme according to the reason for incomplete degreasing is as follows: If the target metal strip is not completely degreased due to unqualified temperature control, the set temperature of the degreasing liquid in the degreasing tank is recorded as W 设 , extract the required compensation temperature corresponding to the unit temperature control deviation from the database and record it as W0, and set the set temperature W corresponding to the degreasing liquid in the degreasing tank in the next batch of degreasing 下 , W 下 =W 设 +(ψ′-ψ)*W0, where ψ′ represents the temperature control qualification of the set reference; If the degreasing of the target metal strip is not thorough due to unqualified residence time control, the set transmission speed of the conveyor belt where the target metal strip is located is recorded as v 设 , extract the required compensation speed corresponding to the unit residence time control deviation from the database and record it as v0, and set the set transmission speed v of the conveyor belt in the next batch of degreasing 下 , in, Indicates the control pass rate of the set reference residence time.

5. The online control system of a metal strip degreasing production line according to claim 2 is characterized in that: The specific process of adjusting the pH value of the degreasing liquid in the degreasing tank in the next batch of degreasing is as follows: The pH value of the degreasing liquid in the degreasing tank in the current batch of degreasing is recorded as ε 当 ; Count the number of white spot areas of the target metal strip after degreasing, locate the white spot area corresponding to each white spot area, and calculate the degreasing over-index β corresponding to the target metal strip; Compare the degreasing over-index corresponding to the target metal strip with the required pH value reduction corresponding to each degreasing over-index stored in the database to obtain the required pH value reduction of the degreasing liquid, which is recorded as ε 降 ; Set the pH value of the degreasing liquid in the degreasing tank for the next batch of degreasing. 下 , ε 下 =ε 当 -ε 降 .

6. The online control system of a metal strip degreasing production line according to claim 5 is characterized in that: The specific process of calculating the degreasing over-index corresponding to the target metal strip is as follows: The number of white spot areas of the target metal strip after degreasing is recorded as τ; The white spot areas corresponding to the white spot regions of the target metal strip after degreasing are accumulated to obtain the total white spot area of ​​the target metal strip after degreasing, which is recorded as S; Calculate the degreasing excess index β corresponding to the target metal strip, Wherein, τ′ and S′ represent the number of white spot regions and the white spot area of ​​the set reference, respectively, and e represents a natural constant.

7. The online control system of a metal strip degreasing production line according to claim 2 is characterized in that: The specific process of judging whether there is a problem with the degreasing effect corresponding to the target production line is as follows: Based on the surface grayscale images of the metal strips in the target production line after degreasing in each batch of degreasing in history, the degreasing state of the metal strips in each batch of degreasing in history is judged in the same way as the degreasing state of the target metal strips in the current batch of degreasing, and the number of times the degreasing state is completely degreased is counted; Calculate the degreasing effect evaluation index χ corresponding to the target production line; The degreasing effect evaluation index corresponding to the target production line is compared with the degreasing effect evaluation index of the set reference. If the degreasing effect evaluation index corresponding to the target production line is greater than or equal to the degreasing effect evaluation index of the set reference, it indicates that there is no problem with the degreasing effect corresponding to the target production line. Otherwise, it indicates that there is a problem with the degreasing effect corresponding to the target production line.

8. The online control system of a metal strip degreasing production line according to claim 7 is characterized in that: The image information includes the number of sediments and the volume of each sediment.

9. The online control system of a metal strip degreasing production line according to claim 8, characterized in that: The specific process of confirming the reason why there is a problem with the degreasing effect corresponding to the target production line is as follows: Extract the number of sediments and the volume of each sediment from the image information corresponding to the degreasing liquid in the degreasing tank, and calculate the cleanliness ω corresponding to the degreasing liquid in the degreasing tank accordingly; The cleanliness corresponding to the degreasing liquid in the degreasing tank is compared with the cleanliness of the set reference. If the cleanliness corresponding to the degreasing liquid in the degreasing tank is less than the cleanliness of the set reference, the reason why there is a problem with the degreasing effect corresponding to the target production line is the aging of the degreasing liquid. Otherwise, the reason why there is a problem with the degreasing effect corresponding to the target production line is other reasons.

10. An online control method for a metal strip degreasing production line, characterized in that: include: S1. Degreasing state judgment: the metal strip degreasing production line in the target factory is recorded as the target production line, and the surface grayscale image of the target metal strip corresponding to the target production line after degreasing is completed in the current batch of degreasing is collected to judge the degreasing state of the target metal strip in the current batch of degreasing, wherein the degreasing state includes complete degreasing, incomplete degreasing and excessive degreasing; S2. Degreasing information collection: collect the set temperature, pH value and temperature at each monitoring time point corresponding to the degreasing liquid in the degreasing tank in the current batch of degreasing, extract the set transmission speed of the conveyor belt where the target metal strip is located, and collect the set residence time and actual residence time of the target metal strip in the degreasing tank; S3. Analysis of incomplete degreasing: When the degreasing status is incomplete degreasing, confirm the reason why the target metal strip is not completely degreased, and match the corresponding control plan according to the reason; S4, degreasing over-analysis: when the degreasing state is degreasing over-analysis, the pH value of the degreasing liquid in the degreasing tank in the next batch of degreasing is adjusted; S5. Feedback on degreasing effect of production line: Extract the surface grayscale images of metal strips in each batch of historical degreasing of the target production line after degreasing is completed, and determine whether there is a problem with the degreasing effect of the target production line. If there is a problem, collect the image corresponding to the degreasing liquid in the degreasing tank, confirm the cause of the problem with the degreasing effect of the target production line, and provide feedback.

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