Real-time cold-rolled galvanized strip steel process control method and system

Abstract

The invention belongs to the field of cold-rolled strip steel galvanization, and particularly relates to a real-time cold-rolled galvanized strip steel process control method and system.The method comprises the steps that S1, galvanized strip steel sequentially passes through an inlet tension roller set, a drying device and an outlet tension roller set to be treated; s2, the single-time sliding amount of the processed galvanized strip steel and the roller surface of the outlet tension roller set and the sliding frequency in unit time are detected, the critical point at which the processed galvanized strip steel starts to slide on the roller surface of the tension roller is measured and calculated through statistical analysis, and data are recorded; and S3, based on the critical point and the data in the S2, a drying device is controlled to start hot air, and jet drying control treatment is conducted on the treated galvanized strip steel and the roller surface of the outlet tension roller set. The invention solves the problem of product quality problem of a galvanized belt caused by moisture accumulation on the surface of an outlet tension roller group when the extrusion drying process data in the desalted water spraying, stretching, straightening and extrusion drying process of a continuous galvanizing unit is poor.

Description

Technical Field

[0001] The invention belongs to the field of cold-rolled steel strip galvanizing, and in particular relates to a real-time cold-rolled galvanized steel strip process control method and system. Background Art

[0002] The production process of the plate is that iron ore, coke and flux are sintered and smelted in a blast furnace to form molten iron, which is then treated with desulfurization and dephosphorization, converter blowing and other processes and cast by a continuous casting machine to form a rectangular steel billet, which is then made into a semi-finished cold-hardened plate steel coil through hot rolling and cold rolling production lines.

[0003] In the prior art, the galvanizing production line in cold-rolled sheet production includes the first entry stage of uncoiling, welding, entry looper, the second central stage of cleaning, heating, annealing, and the third process stage of strip galvanizing, cooling, smoothing, desalted water spraying, stretching, straightening, extrusion drying, chemical passivation, induction heating treatment, and finally the fourth exit stage of exit looper, finished strip slitting, steel coil winding, and weighing, thereby producing finished galvanized sheet steel coil products that meet the different requirements of customers. See the schematic diagram of the galvanizing process for details. Figure 2 The process section of the galvanizing production line is the core of the entire galvanizing production line. The inlet and outlet tension rollers are driven by motors to provide the tension required by different process equipment. The entire process section requires continuous and uninterrupted production under stable tension. Once the tension is unstable, it will cause abnormal production of various process equipment and product quality accidents. In severe cases, it will cause the production line to slow down and shut down, and at the same time generate tons of waste and a large amount of loss of energy media such as electricity, gas, nitrogen, and zinc liquid. See the schematic diagram of the process section of the galvanizing production line. Figure 3 . The desalted water spray stretching, straightening, extrusion and drying process in the process section consists of an inlet tension roller group, a desalted water spray straightening machine, a squeeze roller, a drying bellows, and an outlet tension roller group. The inlet and outlet tension roller groups are composed of tension rollers No. 1 and No. 2, respectively. The desalted water spray straightening machine is installed between two groups of tension rollers. The four tension rollers are driven by four vector-controlled speed regulating motors of the inlet and outlet tension roller groups. The static friction between the tension roller surface and the galvanized strip surface is relied on to generate a speed difference between the inlet and outlet tension roller groups through speed regulation, providing a large tension (maximum 20t) for the straightening machine. The straightening machine bends, stretches, and straightens the galvanized strip on the working roller group. Desalted water is sprayed on the straightening machine roller system and the galvanized strip to ensure cooling and lubrication during the straightening process and avoid damaging the galvanized layer on the surface of the galvanized strip. See the schematic diagram of the desalted water spray stretching, straightening, extrusion and drying process (side view) for details. Figure 4 .

[0004] Since the drying distance is short (<3m) during the desalted water spraying, stretching, straightening and extrusion drying process of the continuous galvanizing unit, the rated process speed of the galvanized strip is generally above 180m / min. When the extrusion drying process data is poor, the desalted water sprayed on the galvanized strip in the desalted water spraying straightening machine frame will be brought into the surface of the outlet tension roller group. At the same time, wet accumulation will inevitably occur on the surface of the outlet tension roller group, and the friction coefficient between the surface of the galvanized strip and the surface of the outlet tension roller will decrease, causing the galvanized strip to slip on the outlet tension roller group. The tension provided to the desalted water spraying straightening machine will decrease and fluctuate, which cannot meet the process requirements, resulting in product quality and equipment accidents such as wavy, tearing, broken strips, surface scratches, and damage to the straightening roller system.

[0005] Therefore, it is urgent to develop a real-time cold-rolled galvanized strip process control method and system to perform real-time detection of the sliding situation between the surface of the exit tension roller group and the surface of the galvanized strip, roller surface drying, early warning, and deterioration trend control, so as to stabilize the tension of the desalted water spray straightening process. Summary of the invention

[0006] In view of this, the technical problem to be solved by the present invention is: to propose a real-time cold-rolled galvanized strip process control method and system, to solve the problem that in traditional technology, when the extrusion and drying process data of the desalted water spraying, stretching, straightening and extrusion drying process of the continuous galvanizing unit is poor, moisture accumulation occurs on the surface of the outlet tension roller group, causing the galvanized strip to slip on the outlet tension roller group, and the straightening tension decreases and fluctuates, resulting in product quality and equipment accidents such as wavy galvanized strip, tearing, broken strip, surface scratches, damage to the straightening roller system, etc.

[0007] The technical solution adopted by the present invention to solve the above technical problems is as follows: A first aspect of the present invention provides a real-time cold-rolled galvanized strip steel process control method, the method comprising: S1, galvanized steel strip is processed in sequence through the entrance tension roller group, drying device and exit tension roller group; S2. Detect the single slip amount of the treated galvanized steel strip and the roller surface of the exit tension roller group and the number of slips per unit time. Calculate the critical point where the treated galvanized steel strip begins to slip on the roller surface of the tension roller through statistical analysis, and record the measurement data. S3. Based on the critical point and the measurement data, the drying device is controlled to start hot air, and the treated galvanized steel strip and the roller surface of the exit tension roller group are subjected to spray drying control treatment.

[0008] In some embodiments, the galvanized steel strip is further subjected to desalting spray stretching straightening and squeezing treatments through a desalting spray stretching straightening process and a squeezing process before the spray drying control treatment; The S3 also includes: based on the critical point and the measurement data, adjusting the parameters of the desalting spray stretching straightening process and the squeezing process while performing spray drying control treatment on the roller surface of the processed galvanized strip and the exit tension roller group.

[0009] In some embodiments, the method further includes S4, which includes adjusting the parameters of the desalination spray stretching straightening process and the squeezing process in S3 while performing sound and light alarms.

[0010] The second aspect of the present invention also discloses a real-time cold-rolled galvanized steel strip process control system, including a detection control system and a drying system; The galvanized strip is processed sequentially through the entry tension roller group, drying system and exit tension roller group; The detection control system detects the single sliding amount of the treated galvanized steel strip and the roller surface of the exit tension roller group and the number of sliding times per unit time, calculates the critical point at which the treated galvanized steel strip begins to slide on the roller surface of the tension roller through statistical analysis, and records the measurement data; Based on the critical point and the measurement data, the drying system is controlled by the detection control system to perform spray drying control treatment on the roller surface of the treated galvanized steel strip and the exit tension roller group.

[0011] In some embodiments, the drying system includes a drying bellows, a hot air valve and a hot air spray chamber connected in sequence, and the drying bellows, the hot air valve and the hot air spray chamber are respectively communicatively connected to the detection and control system, and the detection and control system controls the drying bellows, the hot air valve and the hot air spray chamber to perform spray drying control treatment on the treated galvanized strip and the roller surface of the outlet tension roller group.

[0012] In some embodiments, the upstream of the drying bellows also includes a desalting spray straightening machine and a squeezing roller connected in sequence, and the desalting spray straightening machine and the squeezing roller are respectively communicatively connected to the detection and control system. Based on the critical point and the measurement data, the detection and control system adjusts the parameters of the desalting spray straightening machine and the squeezing roller while performing spray drying control treatment on the roller surface of the treated galvanized strip and the exit tension roller group.

[0013] In some embodiments, the detection control system includes a detection controller and a galvanizing unit PLC; The detection controller includes: a detection PLC, and an HMI human-machine interface electrically connected to the detection PLC; The detection controller is connected to the PLC of the galvanizing unit via a data communication interface; The detection PLC is used to process the critical point and the measurement data to obtain detection data; The HMI human-machine interface is used to receive the measurement data; The galvanizing unit PLC is used to process the measurement data processed by the detection PLC and output control instructions; The detection controller is connected with the inlet tension roller group, the outlet tension roller group and the drying system through an encoder.

[0014] In some embodiments, based on the critical point and the measurement data, the galvanizing unit PLC includes a data communication interface, and the intervention coefficient is sent through the communication interface to optimize the parameters of the desalting spray straightening machine and the squeeze roller.

[0015] In some embodiments, the detection and control system further comprises a multi-state flash alarm, which performs an audible and visual alarm based on the critical point and the measurement data to remind the desalination spray straightening machine and the squeeze roller of parameter changes.

[0016] In some embodiments, the encoder is located at the entrance and exit positions of the entrance tension roller group; and the encoder is located at the entrance and exit positions of the exit tension roller group.

[0017] The beneficial effects of the present invention include at least: the present invention provides a real-time cold-rolled galvanized strip process control method and system, detects the single slip amount of the galvanized strip and the roller surface of the outlet tension roller group and the number of slips per unit time, and through statistical analysis, calculates the critical point at which the treated galvanized strip begins to slip on the roller surface of the tension roller, and records the measurement data, and based on the aforementioned critical point and measurement data, controls the drying device to start hot air, and sprays and controls the roller surface of the treated galvanized strip and the outlet tension roller group to perform spray drying control treatment. In the traditional technology, when the extrusion drying process data of the desalted water spray stretching straightening extrusion drying process of the continuous galvanizing unit is poor, wet accumulation occurs on the surface of the outlet tension roller group, causing the galvanized strip to slip on the outlet tension roller group, and the tension of the straightening roller group decreases and fluctuates, resulting in product quality and equipment accidents such as wavy, tearing, broken strips, surface scratches, and damage to the straightening roller system of the galvanized strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying creative work.

[0019] Figure 1 Shown is a flow chart of a real-time cold-rolled galvanized steel strip process control method in some embodiments of the present invention; Figure 2 Shown is a schematic diagram of the galvanizing process described in the background technology; Figure 3 Shown is a schematic diagram of a process section of a galvanizing production line in the background art; Figure 4 The figure shows a side view schematic diagram of the desalted water spraying, stretching, straightening, extruding and drying process shown in the background technology; Figure 5 The figure shows the principle diagram of the real-time cold-rolled galvanized strip steel process control system; Figure 6 Shown is a schematic diagram of encoder positions in some embodiments of the present invention; Figure 7 Shown is a schematic diagram of pulse coupling data flow in some embodiments of the present invention; Figure 8 The figure is a schematic diagram of the internal data processing flow of the detection controller in some embodiments of the present invention; Description of Reference Numerals 1. Inlet tension roller group; 101, roller No. 1; 102, roller No. 2; 2. Drying system; 201, desalting spray straightening machine; 202, squeeze roller; 203, drying bellows; 2031, hot air valve No. 1 and hot air spray chamber; 2032, hot air valve No. 2 and hot air spray chamber; 3. Exit tension roller group; 4. Detection control system; 401, detection controller; 402, galvanizing unit PLC; 4011, detection PLC; 4012, HMI human-machine interface; 403, multi-state flash alarm; 5. Encoder; 6. Coupling; 7. Reducer; 8. Motor; 9. First tension roller; 10. Galvanized strip. DETAILED DESCRIPTION

[0020] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0021] like Figure 1 and Figure 3 As shown, the first aspect of the present invention provides a real-time cold-rolled galvanized strip process control method, the method comprising: S1, the galvanized steel strip 10 is processed in sequence through the inlet tension roller group 1, the drying device and the outlet tension roller group 3; S2, detecting the single slip amount of the treated galvanized steel strip 10 and the roller surface of the exit tension roller group 3 and the number of slips per unit time, calculating the critical point at which the treated galvanized steel strip 10 starts to slip on the roller surface of the tension roller through statistical analysis, and recording the measurement data; S3. Based on the critical point and the measurement data, the drying device is controlled to start the hot air, and the treated galvanized steel strip 10 and the roller surface of the outlet tension roller group 3 are spray-dried and controlled.

[0022] The present invention provides a real-time cold-rolled galvanized steel strip process control method, which detects the single sliding amount of the roller surface of the galvanized steel strip 10 and the exit tension roller group 3 and the number of sliding times per unit time, and through statistical analysis, measures the critical point at which the processed galvanized steel strip 10 starts to slide on the roller surface of the tension roller, records the data, and controls the drying device to start hot air based on the critical point and the measurement data, and performs spray drying control treatment on the roller surface of the processed galvanized steel strip 10 and the exit tension roller group 3. In the conventional technology, when the extrusion drying process data of the desalted water spraying, stretching, straightening and extrusion drying process of the continuous galvanizing unit is poor, wet accumulation occurs on the surface of the exit tension roller group 3, causing the galvanized steel strip 10 to slip on the exit tension roller group 3, and the tension and straightening tension decreases and fluctuates, resulting in product quality and equipment accidents such as the galvanized steel strip 10 being wavy, torn, broken, surface scratched, and the tension and straightening roller system being damaged. The real-time cold-rolled galvanized strip steel process control method of the present invention is independent of the historical data of a specific production line. The method of the present invention can be adjusted in real time according to different production lines, and can detect and flexibly process the moisture condition of the roller group surface in real time, thereby realizing real-time detection of the sliding condition of the cold-rolled galvanized strip steel roller surface, and timely controlling the degradation trend of the cold-rolled galvanized strip steel process production line.

[0023] In order to further improve the surface cleanliness and flatness of the galvanized steel strip 10 and improve product quality and production efficiency, in some embodiments, the galvanized steel strip 10 is further subjected to desalting spray stretching straightening and squeezing treatments through a desalting spray stretching straightening process and a squeezing process before the spray drying control treatment; The S3 also includes: based on the critical point and the measurement data, adjusting the parameters of the desalting spray stretching straightening process and the squeezing process while performing spray drying control treatment on the treated galvanized steel strip 10 and the roller surface of the exit tension roller group 3. Through the above operation, the process steps can be better adjusted, and the parameters of the desalting spray stretching straightening process and the squeezing process can be adjusted.

[0024] In some embodiments, the method further includes S4, which includes adjusting the parameters of the desalting spray stretching straightening process and the squeezing process in S3 while performing an audible and visual alarm. In some embodiments of the present invention, an audible and visual alarm is performed by the multi-state flash alarm 403 of the detection controller 401 to remind the operator to pay attention to the desalting water spray stretching straightening squeezing drying process data, and perform manual intervention adjustment when necessary.

[0025] In some specific embodiments, the method of the present invention comprises the following steps: S1, the galvanized steel strip 10 is processed in sequence through the inlet tension roller group 1, the drying device and the outlet tension roller group 3; S101, collecting pulse coupling data of an inlet tension roller and an outlet tension roller; S102, statistically analyzing the aforementioned pulse coupling data, calculating and processing to obtain the critical point at which the galvanized steel strip 10 starts to slide on the roller surface of the tension roller, recording the measurement data, and analyzing and judging the measurement data; S2. According to the critical point and data of S102, when the outlet tension roller has the phenomenon of increasing speed and decreasing torque, determine whether it has a slight sliding critical point; S3. Based on the critical point and measurement data of S2, if no slight sliding critical point is generated, no treatment is performed. If a slight sliding critical point is generated, the hot air is turned on, and the surface of the tension roller and the upper and lower surfaces of the strip are spray-dried and controlled. At the same time, the desalted water spray stretching correction process is optimized, and sound and light alarms are performed.

[0026] The second aspect of the present invention provides a real-time cold-rolled galvanized strip process control system, including a detection control system 4 and a drying system 2, the system principle schematic diagram is shown as follows: Figure 5 As shown; The galvanized steel strip 10 is processed in sequence through the inlet tension roller group 1, the drying system 2 and the outlet tension roller group 3; The detection control system 4 detects the single sliding amount of the treated galvanized steel strip 10 and the roller surface of the exit tension roller group 3 and the number of sliding times per unit time, calculates the critical point at which the treated galvanized steel strip 10 starts to slide on the roller surface of the tension roller through statistical analysis, and records the measurement data; Based on the critical point and the measurement data, the drying system 2 is controlled by the detection control system 4 to perform spray drying control treatment on the treated galvanized steel strip 10 and the roller surface of the exit tension roller group 3.

[0027] The communication connection between the drying bellows 203 , the hot air valve and the hot air spray chamber of the present invention enables the control system to control the drying process more flexibly and accurately, further improving the drying effect of the galvanized steel strip 10 .

[0028] In some embodiments, the drying system 2 includes a drying bellows 203, a hot air valve and a hot air spray chamber connected in sequence, and the drying bellows 203, the hot air valve and the hot air spray chamber are respectively communicated with the detection and control system 4, and the detection and control system 4 controls the drying bellows 203, the hot air valve and the hot air spray chamber to perform spray drying control treatment on the treated galvanized strip 10 and the roller surface of the outlet tension roller group 3.

[0029] In some specific embodiments, the drying system 2 further includes a No. 1 hot air valve, a hot air spray chamber, and an electrical control interface connected thereto, and a No. 2 hot air valve, a hot air spray chamber, and an electrical control interface connected thereto.

[0030] In some embodiments, the upstream of the drying bellows 203 also includes a desalting spray straightening machine 201 and a squeeze roller 202 (such as Figure 5 As shown), the desalting spray straightening machine 201 and the squeeze roller 202 are respectively connected to the detection control system 4 for communication. The detection control system 4 adjusts the parameters of the desalting spray straightening machine 201 and the squeeze roller 202 while performing spray drying control treatment on the treated galvanized steel strip 10 and the roller surface of the outlet tension roller group 3 based on the critical point and measurement data described in the first aspect. Through the desalting spray straightening machine 201 and the squeeze roller 202 connected by communication, the process parameters can be adjusted in real time to ensure that the galvanized steel strip 10 can achieve the best treatment effect under different production conditions.

[0031] In order to improve the automation level and data processing capability of the production process, in some embodiments, the detection control system 4 includes a detection controller 401 and a galvanizing unit PLC (programmable logic controller) 402; The detection controller 401 includes: a detection PLC (Programmable Logic Controller) 4011 and an HMI human-machine interface 4012 electrically connected to the detection PLC 4011 ; wherein the detection PLC may be a high-speed small PCL.

[0032] The detection controller 401 is connected to the galvanizing unit PLC 402 via a data communication interface; The detection PLC4011 is used to process the critical points and measurement data described in the first aspect; The HMI (Human Machine Interface) 4012 is used to receive the data in the first aspect; The galvanizing unit PLC402 is used to process the data processed by the detection PLC4011 and output control instructions; The detection controller 401 is connected to the inlet tension roller group 1, the outlet tension roller group 3 and the drying system 2 through the encoder 5. The combined use of the detection controller 401 and the galvanizing unit PLC 402 realizes the precise control of the processing process of the galvanized steel strip 10, and improves the automation level and data processing capability of the production process.

[0033] The inlet tension roller group 1 and the outlet tension roller group 3 include a length pulse encoder 5 and a data interface for collecting a single sliding amount of the roller surface and the number of sliding times per unit time.

[0034] In some embodiments, based on the critical point and measurement data described in the first aspect, the galvanizing unit PLC402 includes a data communication interface, and the intervention coefficient is sent through the communication interface to optimize the parameters of the desalting spray straightening machine 201 and the squeeze roller 202. By sending the intervention coefficient through the data communication interface of the galvanizing unit PLC402, the working parameters of the desalting spray straightening machine 201 and the squeeze roller 202 can be optimized in real time, further improving product quality.

[0035] In some embodiments, the detection and control system 4 further includes a multi-state flash alarm 403. Based on the critical point and the measurement data described in the first aspect, the multi-state flash alarm 403 performs an audible and visual alarm to remind the desalination spray straightening machine 201 and the squeeze roller 202 of parameter changes. The use of the multi-state flash alarm 403 provides operators with intuitive process parameter change prompts, enhancing the monitoring and early warning capabilities of the production process.

[0036] In some embodiments, the multi-state flash alarm 403 further includes a multi-state flash alarm 403 control signal interface for receiving a signal from a detection control system 4 .

[0037] like Figure 6 As shown, in some embodiments, the encoder 5 is located at the entrance and exit positions of the entrance tension roller group 1, and the entrance and exit positions of the exit tension roller group 3. The setting position of the encoder 5 ensures the accurate monitoring of the entrance and exit positions of the galvanized steel strip 10 at the tension roller group, provides accurate data support for the control system, and thus improves the accuracy and reliability of the entire process control.

[0038] The scheme of the present invention will be explained below in conjunction with embodiments. It will be understood by those skilled in the art that the following embodiments are only used to illustrate the present invention and should not be regarded as limiting the scope of the present invention.

[0039] Example 1 Figure 5 The schematic diagram of the system principle of this embodiment is shown. The galvanized steel strip 10 is processed by the inlet tension roller group 1, the drying system 2 and the outlet tension roller group 3 in sequence. The detection control system 4 is used to detect and obtain three groups of pulse coupling data of the galvanized steel strip 10 and the outlet tension roller group 3, which are as follows: In order to improve the precision, accuracy and reliability of the rotation position of the entrance roller 101 and roller 2, 102, and the exit roller 101 and tension roller 2 in the detection controller 401 of the detection control system 4. The real-time cold-rolled galvanized strip steel 10 process control system installs an encoder 5 on the central axis of the entrance roller 2, the exit roller 101, and the exit roller 2, and sends the pulse data detected by the three encoders 5 to the detection controller 401 as basic data. The detection controller 401 receives the motor 8 encoder 5 data of roller 101 of the entrance tension roller group 1, roller 101 of the exit tension roller group 3, and roller 102 of the exit tension roller group 3 as auxiliary data. The position of the encoder 5 is as shown in Figure 6 As shown, taking the inlet tension roller group 1 or the outlet as an example, it is assumed that the tension roller group includes a first tension roller 9 (the first tension roller 9 can be roller No. 1 101 or roller No. 2 102), and also includes an encoder 5, a first tension roller 9, a reducer 7, a coupling 6, and a motor 8, wherein the encoder 5 is connected to one side of the first tension roller 9, and the other side of the first tension roller 9 is connected in series with the reducer 7, the motor 8, and another encoder 5, wherein both ends of the reducer 7 are connected in parallel with the coupling 6, as shown in FIG. Figure 6 shown.

[0040] The basic data and auxiliary data on each first tension roller 9 form a group of data, with the basic data as the main data, and the auxiliary data comparing, correcting, interpolating and interlocking the basic data. Three groups of pulse coupling data are formed for roller 102 of the inlet tension roller group 1, roller 101 of the outlet tension roller group 3, and roller 102 of the outlet tension roller group 3. When the deviation between the basic data and the auxiliary data exceeds the deviation alarm limit value set in the detection controller 401, the multi-state flash alarm 403 will sound an audible and visual alarm, and the operator will check and verify the data, and the data will be decoupled at the same time. See the pulse coupling data flow diagram. Figure 7 .

[0041] Based on the three sets of pulse coupling data in the previous step, statistical analysis is performed on the single sliding value, duration, and single sliding interval and number per unit time: The detection controller 401 compares the pulse coupling data of roller 101 of the inlet tension roller group 1 and roller 101 of the outlet tension roller group 3; compares the pulse coupling data of roller 101 of the inlet tension roller group 1 and roller 102 of the outlet tension roller group 3; and compares the pulse coupling data of roller 101 of the outlet tension roller group 3 and roller 102 of the outlet tension roller group 3. At the same time, the deviation discrimination coefficient and the change rate discrimination coefficient are introduced into the detection controller 401. When the deviation and the change rate exceed the discrimination coefficient, the detection controller 401 determines whether the motor 8 of roller 101 of the corresponding outlet tension group and roller 102 of the outlet tension group has a speed increase and a torque decrease. If so, the detection controller 401 starts to record the difference in its pulse coupling data and converts it into an exact sliding value. At the same time, it records the single sliding value and the duration of a single sliding, and counts the interval time and number of single sliding in unit time. See the schematic diagram of the internal data processing flow of the detection controller 401. Figure 8 .

[0042] Based on the critical point and the measurement data, the drying system 2 is controlled by the detection control system 4: based on the detection controller 401 in the previous step, the single sliding amount, the single sliding duration, the sliding interval time, and the number of sliding times per unit time are statistically analyzed and compared with the sliding evaluation limit coefficient to calculate the critical point of slight sliding. When the slight sliding critical point is generated, the detection controller 401 controls the hot air valve corresponding to the drying system 2 to introduce hot air through the hot air chamber to spray and dry the corresponding outlet tension roller surface and the upper and lower surfaces of the strip (see Figure 5 The No. 1 hot air valve and hot air spray chamber 2031, as well as the No. 2 hot air valve and hot air spray chamber 2032 of the galvanizing unit are detected and the intervention coefficient is sent through the data communication interface between the detection controller 401 and the galvanizing unit PLC402 to optimize the intervention of the desalted water spraying, stretching, straightening, extruding and drying process data. The multi-state flash alarm 403 of the detection controller 401 is used to sound and light alarm to remind the operator to pay attention to the desalted water spraying, stretching, straightening, extruding and drying process data, and to make manual intervention adjustments when necessary.

[0043] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A real-time cold-rolled galvanized strip process control method, characterized in that: The method comprises: S1, the galvanized steel strip (10) is processed in sequence through an inlet tension roller group (1), a drying device and an outlet tension roller group (3); S2, detecting the single slip amount of the treated galvanized steel strip (10) and the roller surface of the exit tension roller group (3) and the number of slips per unit time, calculating the critical point at which the treated galvanized steel strip (10) starts to slip on the roller surface of the tension roller through statistical analysis, and recording the measurement data; S3. Based on the critical point and the measurement data, the drying device is controlled to start hot air, and spray drying control treatment is performed on the roller surface of the treated galvanized steel strip (10) and the exit tension roller group (3).

2. The real-time cold-rolled galvanized strip steel process control method according to claim 1, characterized in that: The galvanized steel strip is also subjected to desalting spraying stretching straightening and squeezing treatments through a desalting spraying stretching straightening process and a squeezing treatment process before being subjected to the spray drying control treatment; The S3 also includes: based on the critical point and the measurement data, adjusting the parameters of the desalting spray stretching straightening process and the squeezing process while performing spray drying control treatment on the treated galvanized steel strip (10) and the roller surface of the outlet tension roller group (3).

3. The real-time cold-rolled galvanized strip steel process control method according to claim 2, characterized in that: The method further includes S4, which includes adjusting the parameters of the desalting spray stretching straightening process and the squeezing process in S3 and performing sound and light alarms at the same time.

4. A real-time cold-rolled galvanized strip steel process control system, characterized in that: It includes a detection and control system (4) and a drying system (2); The galvanized steel strip is processed in sequence through an inlet tension roller group (1), a drying system (2) and an outlet tension roller group (3); The detection control system (4) detects the single slip amount of the treated galvanized steel strip and the roller surface of the exit tension roller group (3) and the number of slips per unit time, calculates the critical point at which the treated galvanized steel strip (10) starts to slip on the roller surface of the tension roller through statistical analysis, and records the measurement data; Based on the critical point and the measurement data, the drying system (2) is controlled by the detection control system (4) to perform spray drying control treatment on the roller surface of the treated galvanized steel strip (10) and the exit tension roller group (3).

5. The real-time cold-rolled galvanized strip steel process control system according to claim 4, characterized in that: The drying system (2) comprises a drying bellows (203), a hot air valve and a hot air spray chamber which are connected in sequence, wherein the drying bellows (203), the hot air valve and the hot air spray chamber are respectively connected in communication with the detection control system (4), and the detection control system (4) controls the drying bellows (203), the hot air valve and the hot air spray chamber to perform spray drying control treatment on the treated galvanized steel strip and the roller surface of the outlet tension roller group (3).

6. The real-time cold-rolled galvanized strip steel process control system according to claim 5, characterized in that: The upstream of the drying bellows (203) also includes a desalting spray straightening machine (201) and a squeezing roller (202) connected in sequence, and the desalting spray straightening machine (201) and the squeezing roller (202) are respectively connected to the detection control system (4) for communication. The detection control system (4) adjusts the parameters of the desalting spray straightening machine (201) and the squeezing roller (202) while performing spray drying control treatment on the treated galvanized steel strip and the roller surface of the outlet tension roller group (3) based on the critical point and the measurement data.

7. The real-time cold-rolled galvanized strip steel process control system according to claim 4, characterized in that: The detection control system (4) comprises a detection controller (401) and a galvanizing unit PLC (402); The detection controller (401) comprises: a detection PLC (4011), and an HMI human-machine interface (4012) electrically connected to the detection PLC (4011); The detection controller (401) is connected to the galvanizing unit PLC (402) via a data communication interface; The detection PLC (4011) is used to process the critical point and the measurement data to obtain detection data; The HMI human-machine interface (4012) is used to receive the measurement data; The galvanizing unit PLC (402) is used to process the measurement data processed by the detection PLC (4011) and output control instructions; The detection controller (401) is connected to the inlet tension roller group (1), the outlet tension roller group (3) and the drying system (2) via an encoder (5).

8. The real-time cold-rolled galvanized strip steel process control system according to claim 7, characterized in that: Based on the critical point and the measurement data, the galvanizing unit PLC (402) includes a data communication interface, and an intervention coefficient is sent through the communication interface to optimize the parameters of the desalting spray straightening machine (201) and the squeeze roller (202).

9. The real-time cold-rolled galvanized strip steel process control system according to claim 7, characterized in that: The detection control system (4) also includes a multi-state flash alarm (403), which performs an audible and visual alarm based on the critical point and the measurement data to remind the desalination spray straightening machine (201) and the squeeze roller (202) of parameter changes.

10. The real-time cold-rolled galvanized strip steel process control system according to claim 7, characterized in that: The encoder (5) is located at the entrance and exit positions of the entrance tension roller group (1); and the encoder (5) is located at the entrance and exit positions of the exit tension roller group (3).

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