CN113083913B - Coiled strip steel temperature control method and device and laminar cooling system - Google Patents
Coiled strip steel temperature control method and device and laminar cooling system Download PDFInfo
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- CN113083913B CN113083913B CN202110345931.5A CN202110345931A CN113083913B CN 113083913 B CN113083913 B CN 113083913B CN 202110345931 A CN202110345931 A CN 202110345931A CN 113083913 B CN113083913 B CN 113083913B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0057—Coiling the rolled product
Abstract
The embodiment of the specification discloses a coiled strip steel temperature control method, a coiled strip steel temperature control device and a layer cooling system, wherein the method is used for controlling the layer cooling system to cool hot rolled strip steel, a first pyrometer and a second pyrometer are arranged at an outlet of the layer cooling system, and the method comprises the following steps: acquiring a target temperature for cooling the strip steel; determining a target pyrometer from the first pyrometer and the second pyrometer based on the target temperature and a preset temperature threshold, and acquiring the temperature of the strip steel through the target pyrometer; and adjusting the cooling parameters of the layer cooling system based on the temperature of the strip steel acquired by the target pyrometer and a preset layer cooling control model. According to the scheme, different pyrometers are automatically switched according to different target temperatures of the coiled strip steel, the pyrometers which accord with target temperature ranges are selected to carry out temperature acquisition, the accuracy of temperature acquisition can be guaranteed, and the temperature control of the coiled strip steel is facilitated.
Description
Technical Field
The embodiment of the specification relates to the field of metallurgy, in particular to a coiled strip steel temperature control method and device and a laminar cooling system.
Background
The cooling after rolling is an important process means for producing the hot rolled strip steel, and the recrystallization of the deformed austenite after hot rolling can be inhibited by improving the cooling speed after rolling, so that the austenite grains are prevented from growing, the ferrite grains are refined in the subsequent phase change process, and the fine grain strengthening of the material is realized at low cost. With the increasing price of steel raw materials and the gradual reduction of the content of precious metal components in steel products, the low-temperature cooling method becomes an important means for improving the mechanical properties of the products.
A great deal of research is also carried out in the aspects of low-temperature coiling and rapid cooling processes in China, besides obvious alloy reduction and performance improvement, the problems of large rolling load, poor plate shape, poor rolling stability and the like are also faced, and particularly, the laminar cooling has low measurement accuracy, high control difficulty and poor control stability, and the requirement of product performance control is difficult to meet.
Disclosure of Invention
The embodiment of the specification provides a method and a device for controlling the temperature of coiled strip steel and a laminar cooling system.
In a first aspect, an embodiment of the present specification provides a coiled strip steel temperature control method, which is used for controlling a laminar cooling system to cool a hot rolled strip steel, wherein an outlet of the laminar cooling system is provided with a first pyrometer and a second pyrometer, a lowest detection temperature of the first pyrometer is higher than a lowest detection temperature of the second pyrometer, and a highest detection temperature of the first pyrometer is higher than a highest detection temperature of the second pyrometer, and the method includes:
acquiring a target temperature for cooling the strip steel;
determining a target pyrometer from the first pyrometer and the second pyrometer based on the target temperature and a preset temperature threshold, and acquiring the temperature of the strip steel through the target pyrometer;
and adjusting the cooling parameters of the laminar cooling system based on the temperature of the strip steel acquired by the target pyrometer and a preset laminar cooling control model.
Optionally, the temperature acquisition range of the first pyrometer is 300 to 1100 ℃, and the temperature acquisition range of the second pyrometer is 0 to 1000 ℃.
Optionally, the determining a target pyrometer among the first pyrometer and the second pyrometer based on the target temperature and a preset temperature threshold includes:
determining that the first pyrometer is the target pyrometer through a secondary process control when the target temperature is greater than or equal to the preset temperature threshold;
and when the target temperature is smaller than the preset temperature threshold value, determining that the second pyrometer is the target pyrometer through secondary process control.
Optionally, after the target pyrometer is the second pyrometer and a target pyrometer is determined from the first pyrometer and the second pyrometer, the method further comprises:
monitoring a pyrometer selection signal through primary basic automation control, wherein the pyrometer selection signal is a signal generated by determining the target high temperature timing in the secondary process control;
and when the pyrometer selection signal represents that the currently running pyrometer is the first pyrometer, taking the second pyrometer as the currently running pyrometer through primary basic automatic control.
Optionally, the unloading temperature of the first pyrometer is 310 ℃ and the unloading temperature of the second pyrometer is 50 ℃.
Optionally, after the target pyrometer is determined in the first pyrometer and the second pyrometer, the method further comprises:
detecting whether the target pyrometer has not acquired temperature;
if the target pyrometer does not acquire the temperature, determining whether the target pyrometer acquires the temperature again within a preset time period;
and if so, determining that the target pyrometer is not unloaded.
Optionally, a cold detection device is disposed in the laminar cooling system, and the method further includes:
and if the cold detection device does not detect the strip steel, generating a coiling machine tail holding signal and sending the coiling machine tail holding signal to a coiling machine so as to enable the coiling machine to carry out tail holding operation.
In a second aspect, an embodiment of the present disclosure provides a coiled strip temperature control apparatus for controlling a laminar cooling system to cool a hot rolled strip, where a first pyrometer and a second pyrometer are disposed at an outlet of the laminar cooling system, a lowest detection temperature of the first pyrometer is higher than a lowest detection temperature of the second pyrometer, and a highest detection temperature of the first pyrometer is higher than a highest detection temperature of the second pyrometer, the apparatus including:
the acquisition module is used for acquiring the target temperature for cooling the strip steel;
the pyrometer determining module is used for determining a target pyrometer from the first pyrometer and the second pyrometer based on the target temperature and a preset temperature threshold value, and acquiring the temperature of the strip steel through the target pyrometer;
and the processing module is used for adjusting the cooling parameters of the laminar cooling system based on the temperature of the strip steel acquired by the target pyrometer and a preset laminar cooling control model.
Optionally, the temperature acquisition range of the first pyrometer is 300 to 1100 ℃, and the temperature acquisition range of the second pyrometer is 0 to 1000 ℃.
Optionally, the pyrometer determination module is to:
determining that the first pyrometer is the target pyrometer through a secondary process control when the target temperature is greater than or equal to the preset temperature threshold;
and when the target temperature is smaller than the preset temperature threshold value, determining that the second pyrometer is the target pyrometer through secondary process control.
Optionally, the system further comprises:
the monitoring module is used for monitoring a pyrometer selection signal through primary basic automation control, wherein the pyrometer selection signal is a signal generated by determining the target high temperature timing in the secondary process control;
and the processing module is used for taking the second pyrometer as the currently running pyrometer through primary basic automatic control when the pyrometer selection signal represents that the currently running pyrometer is the first pyrometer.
Optionally, the unloading temperature of the first pyrometer is 310 ℃ and the unloading temperature of the second pyrometer is 50 ℃.
Optionally, the system further comprises:
the first detection module is used for detecting whether the target pyrometer does not acquire temperature;
the second detection module is used for determining whether the target pyrometer acquires the temperature again within a preset time period when the target pyrometer does not acquire the temperature;
and the pyrometer state determination module is used for determining that the target pyrometer is not unloaded when the target pyrometer reacquires the temperature within a preset time period.
Optionally, a cold detection device is disposed in the laminar cooling system, and the system further includes:
and the coiling control module is used for generating a coiling machine tail-holding signal and sending the coiling machine tail-holding signal to the coiling machine if the cold detection device does not detect the strip steel so as to enable the coiling machine to execute tail-holding operation.
In a third aspect, embodiments of the present description provide a laminar cooling system, comprising:
the detection device comprises a first pyrometer and a second pyrometer which are arranged at an outlet of the laminar cooling system, wherein the lowest detection temperature of the first pyrometer is higher than that of the second pyrometer, and the highest detection temperature of the first pyrometer is higher than that of the second pyrometer;
a controller connected to the first pyrometer and the second pyrometer;
the controller is used for obtaining a target temperature for cooling the strip steel; determining a target pyrometer among the first pyrometer and the second pyrometer based on the target temperature and a preset temperature threshold; receiving the temperature of the strip steel collected by the target pyrometer; and adjusting the cooling parameters of the laminar cooling system based on the temperature of the strip steel acquired by the target pyrometer and a preset laminar cooling control model.
Optionally, the laminar cooling system includes multiple groups of coarse adjustment headers in a normal cooling zone and multiple groups of fine adjustment headers in a fine cooling zone, a spray head structure of the last group of coarse adjustment headers in the normal cooling zone is a three-spray head structure, and a reverse spray device is arranged at an outlet of the last group of fine adjustment headers in the fine cooling zone.
In a fourth aspect, the present specification provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor implements the steps of any of the above methods.
The embodiment of the specification has the following beneficial effects:
in the method for controlling the temperature of coiled strip steel provided by the embodiment of the specification, a first pyrometer and a second pyrometer which have different measuring ranges are arranged at an outlet of a laminar cooling system, when the coiling temperature of the strip steel is controlled, a target temperature for cooling the strip steel is obtained, the target pyrometer is determined from the first pyrometer and the second pyrometer based on the target temperature and a preset temperature threshold value, and the temperature of the strip steel is collected through the target pyrometer; and adjusting the cooling parameters of the layer cooling system based on the strip steel temperature acquired by the target pyrometer and a preset layer cooling control model. According to the scheme, different pyrometers are automatically switched according to different target temperatures of the coiled strip steel, the pyrometers which accord with target temperature ranges more are selected for temperature collection, the temperature collection accuracy can be guaranteed, and the temperature control of the coiled strip steel is facilitated.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the specification. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a flow chart of a method for controlling the temperature of coiled strip steel according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a layer cooling system provided in an embodiment of the present disclosure;
fig. 3 is a schematic diagram of a temperature control device for coiled steel strip according to an embodiment of the present disclosure.
Detailed Description
In order to better understand the technical solutions, the technical solutions of the embodiments of the present specification are described in detail below with reference to the drawings and specific embodiments, and it should be understood that the specific features of the embodiments and embodiments of the present specification are detailed descriptions of the technical solutions of the embodiments of the present specification, and are not limitations of the technical solutions of the present specification, and the technical features of the embodiments and embodiments of the present specification may be combined with each other without conflict.
The embodiment of the specification provides a coiled strip steel temperature control method which is used for controlling a laminar cooling system to cool hot rolled strip steel, wherein a first pyrometer and a second pyrometer are arranged at an outlet of the laminar cooling system, the lowest detection temperature of the first pyrometer is higher than the lowest detection temperature of the second pyrometer, and the highest detection temperature of the first pyrometer is higher than the highest detection temperature of the second pyrometer. As shown in fig. 1, a flowchart of a method for controlling a temperature of a coiled steel strip according to an embodiment of the present disclosure is provided, where the method includes the following steps:
step S11: acquiring a target temperature for cooling the strip steel;
step S12: determining a target pyrometer from the first pyrometer and the second pyrometer based on the target temperature and a preset temperature threshold, and acquiring the temperature of the strip steel through the target pyrometer;
step S13: and adjusting the cooling parameters of the laminar cooling system based on the temperature of the strip steel acquired by the target pyrometer and a preset laminar cooling control model.
In the embodiment of the present disclosure, the application may be applied to a layer cooling system, which is executed by a controller integrated in the layer cooling system, or may be applied to a controller separately provided from the layer cooling system, so as to control the layer cooling system, which is not limited herein.
In the process of producing the hot rolled strip, the coiling temperature directly influences the final quality of a rolled finished product, and in order to ensure the quality of the finished product, the hot rolled strip needs to be rapidly cooled to the required coiling temperature through a laminar cooling system. The laminar cooling system is arranged between the outlet rack of the finishing mill and the coiling machine, the laminar cooling system comprises a plurality of groups of collecting pipes, and when the strip steel is conveyed into the laminar cooling system from the outlet of the finishing mill, a large amount of cooling water is sprayed to the strip steel by controlling the opening of the collecting pipes, so that the temperature of the strip steel is reduced to the coiling temperature.
The exit of layer cold system is provided with first pyrometer and second pyrometer, and wherein, first pyrometer is pyrometer, can be used for gathering the temperature in the higher temperature range, and the second pyrometer is pyrometer low temperature, compares with first pyrometer, and the temperature range that the second pyrometer was gathered is lower. In the embodiment of the specification, the temperature collection range of the first pyrometer is 300 to 1100 ℃, and the temperature collection range of the second pyrometer is 0 to 1000 ℃. Of course, the temperature collecting ranges of the first pyrometer and the second pyrometer may be selected according to actual needs, and are not limited herein. The positions of the first pyrometer and the second pyrometer may be set according to actual requirements, for example, the first pyrometer and the second pyrometer may be located at a distance of 6m from the last group of headers of the laminar cooling system.
It should be noted that the pyrometer has two states of loading and unloading, and when the pyrometer is in the loading state, the temperature collected by the pyrometer can be received by the controller, so that the controller inputs the temperature collected by the pyrometer into the preset laminar cooling control model, and the cooling parameters for cooling the strip steel are output through the preset laminar cooling control model. When the pyrometer is in the uninstallation state, the pyrometer stops collecting the temperature, or the temperature that the pyrometer was gathered is not received by the controller, namely, when the pyrometer is in the uninstallation state, preset layer cold control model can not carry out any calculation, also can't adjust the cooling parameter of layer cold system.
Therefore, if the temperature acquired by the pyrometer is inaccurate, errors exist in the cooling parameters obtained by processing the preset laminar cooling control model, and the cooling of the strip steel is not facilitated. Moreover, if the acquired temperature of the pyrometer is inaccurate, the pyrometer may be unloaded in advance, and if the pyrometer is unloaded, a preset laminar cooling control model cannot be triggered to perform real-time calculation, so that the final temperature control effect of the strip steel is also influenced.
In step S11, the cooling temperature to which different types of strip steel are cooled may be different. In the examples of the present specification, the target temperature is the final temperature reached after the strip steel is cooled, i.e., the coiling temperature. The target temperature may be obtained in various ways, specifically, the target temperature may be preset, for example, a mapping relationship between the target temperature and the type of the strip steel may be stored, and when a certain type of strip steel needs to be cooled, the stored mapping relationship is searched to obtain the corresponding target temperature. Alternatively, the target temperature may be obtained by user input, for example, the user inputs the target temperature through an interactive interface, and the target temperature is obtained by detecting the user input.
In order to accurately acquire the temperature of the strip steel, in the embodiment of the specification, a first pyrometer and a second pyrometer are arranged, the acquisition ranges of the first pyrometer and the second pyrometer are different, and different pyrometers can be selected for acquiring the temperature according to different target temperatures. In a specific implementation, step S12 may perform the selection of the pyrometer by: when the target temperature is greater than or equal to a preset temperature threshold value, determining that the first pyrometer is a target pyrometer through secondary process control; and when the target temperature is smaller than the preset temperature threshold value, determining that the second pyrometer is the target pyrometer through the secondary process control.
Specifically, the selection of pyrometers may be automated by a two-stage process control based on a target temperature. The preset temperature threshold may be set according to actual needs, for example, 400 ℃, 450 ℃, and the example in this specification takes the preset temperature threshold as 400 ℃ as an example. When the target temperature is more than or equal to 400 ℃, the first pyrometer is selected by the secondary process control, and when the target temperature is less than 400 ℃, the second pyrometer is selected by the secondary process control.
It should be noted that, for the second pyrometer (low-temperature pyrometer), in the embodiment of the present specification, a pyrometer with a temperature acquisition range of 0 to 1000 ℃ is used as the low-temperature pyrometer, instead of the low-temperature pyrometer with a temperature acquisition range of 100 to 700 ℃ in the prior art, and the acquisition range of the low-temperature pyrometer is increased. In the actual production process, particularly when the strip steel is coiled at a low temperature with a low rolling target temperature, the field temperature measurement is interfered by a plurality of external conditions, such as mist, water vapor, residual water on the surface of the strip steel and the like on the field, the actual temperature fluctuates, the pyrometer with a large measuring range is selected, and even if the actual temperature fluctuates greatly, the continuous collection of the temperature and the non-unloading of the pyrometer can be ensured, so that the continuous adjustment of the cooling parameters of a layer cooling system is ensured, and the stable cooling of the strip steel is ensured. Conversely, if the range of the pyrometer is small, it is likely that the pyrometer will unload when the measured temperature fluctuates, thereby interrupting the adjustment of the cooling parameters, resulting in inaccuracies in the final strip temperature control.
At present, the rolling difficulty of low-temperature coiling strip steel lies in the difficulty of temperature control, and the difficulty of temperature control is caused by various factors, wherein, the inaccurate measurement of a pyrometer is one of the factors. Therefore, in order to improve the accuracy of temperature control on the low-temperature steel, in the embodiment of the present specification, when rolling the low-temperature coiled steel strip, in order to ensure that the second pyrometer is selected, whether the selection of the pyrometers is successful or not can be further verified through primary and secondary control, and in a specific implementation process, the following method is implemented: monitoring a pyrometer selection signal through primary basic automation control, wherein the pyrometer selection signal is a signal generated by determining target high temperature timing in secondary process control; when the pyrometer selection signal represents that the currently operating pyrometer is the first pyrometer, the second pyrometer is used as the currently operating pyrometer through primary basic automatic control.
Specifically, when the secondary process control selects a pyrometer, a corresponding pyrometer select signal is generated, for example, a pyrometer select signal having a signal variable of 1 indicates that a first pyrometer is currently selected, and a pyrometer select signal having a signal variable of 2 indicates that a second pyrometer is currently selected. In order to ensure that the second pyrometer is selected when the strip steel is rolled at low temperature, in the embodiment of the specification, a pyrometer selection signal is monitored through primary basic automatic control, whether the pyrometer selection signal is 2 or not is verified, namely whether the currently running pyrometer is the second pyrometer or not is verified, and if not, the primary basic automatic control forcibly selects the second pyrometer.
In step S12, after the target pyrometer is determined, the temperature of the strip steel is acquired in real time by the target pyrometer, and in step S13, the temperature acquired in real time is input into a preset layer cooling control model, and the cooling parameters of the layer cooling system are output, and further the previous cooling parameters are adjusted according to the cooling parameters of the layer cooling system.
It should be noted that the preset floor cooling control model is a pre-trained model, the input of the model includes the strip steel temperature collected by the target pyrometer, and may also include other input parameters, such as target temperature, strip steel transmission speed, etc., the preset floor cooling control model may include feed-forward control and feedback control, by processing the input data, the model finally outputs the cooling parameters of the floor cooling system, and the cooling parameters may include the number of switches of the headers in the floor cooling system, the water flow rate of the headers spraying cooling water, etc. The temperature collected by the target thermometer changes in real time, so that the cooling parameters output by the preset laminar cooling control model also change in real time, and the cooling of the strip steel can be accurately realized by continuously adjusting the cooling parameters in the laminar cooling system.
Furthermore, in order to prevent the pyrometers from being unloaded or unloaded in advance due to the fact that the measurement of the pyrometers fluctuates due to inaccurate control of the strip steel coiling temperature, residual water on the surface of the strip steel, external environmental factors and the like, in the embodiment of the specification, the unloading possibility of the pyrometers can be reduced by reducing the unloading threshold value of the pyrometers. In a specific implementation, the unloading temperature of the first pyrometer was adjusted down to 310 ℃ and the unloading temperature of the second pyrometer was adjusted down to 50 ℃. Of course, the unloading temperature of the first pyrometer and the second pyrometer may also have other values, which are not limited herein.
In addition, in addition to reducing the threshold value of the pyrometer, the embodiment of the present specification further adds a filtering function of a loaded signal to the pyrometer, and detects whether the target pyrometer does not acquire temperature in the specific implementation process; if the target pyrometer does not acquire the temperature, determining whether the target pyrometer acquires the temperature again within a preset time period; if yes, determining that the target pyrometer is not unloaded.
Specifically, when the strip steel reaches the target pyrometer, the temperature of the target pyrometer cannot be detected due to the fact that water sprayed in the cooling process may remain on the surface of the strip steel or a lot of fog exists on the site. But in practice the failure of the target pyrometer to detect the temperature is not due to the absence of strip operation but to the above-mentioned external disturbances, which would obviously reduce the accuracy of the control of the strip temperature if the pyrometers were to be unloaded in this case.
Therefore, in the embodiment of the present specification, when it is detected that the target pyrometer does not acquire the temperature, it is determined whether the target pyrometer acquires the temperature again within a preset time period, wherein the preset time period may be set according to actual needs, for example, according to the rolling speed on site. In the embodiment of the present specification, the preset time period may range from 1 s to 5s, and the preset time period is taken as 3s for example. Generally, the strip steel is transmitted for dozens of meters in the running time of 3s, so that the condition that the target pyrometer cannot acquire the temperature caused by external interference can be effectively eliminated. Therefore, if the target pyrometer acquires the temperature again within the preset time period, namely within 3s or less, the strip steel still runs, the target pyrometer is determined not to be unloaded, and the model is ensured to continuously calculate the cooling parameters.
It should be noted that the position tracking of the strip steel can be realized by loading/unloading the pyrometer, and if the pyrometer is unloaded, the strip steel is conveyed, and at this time, the coiler can be controlled to carry out tail holding action. However, as described above, if the pyrometers are unloaded in advance due to external factors, the coiler could be caused to seize the tail in advance, which in turn causes the strip to break in a cold zone. In order to avoid the above problems, in the embodiments of the present specification, cold detection is used to track the strip steel, so as to control the coiler to perform tail holding.
In the specific implementation process, the cold detection device comprises a transmitting end and a receiving end, wherein the transmitting end can emit laser, if the transmitting end is not shielded from the receiving end, the receiving end can receive the laser emitted by the transmitting end, and if the transmitting end is shielded from the receiving end, the receiving end cannot receive the laser.
In the embodiment of the description, a cold detection device is arranged in the laminar cooling system, and if the cold detection device does not detect the strip steel, a tail holding signal of the coiling machine is generated and sent to the coiling machine, so that the coiling machine performs tail holding action. The cold detection device can be arranged in the layer cooling system according to needs, for example, the cold detection device is arranged at an outlet of the layer cooling system, a transmitting end and a receiving end of the cold detection device can be respectively arranged at two sides of the strip steel, namely, the strip steel runs between the transmitting end and the receiving end, when the receiving end does not receive laser emitted by the transmitting end, the normal running of the strip steel is indicated, if the receiving end receives the laser, the shielding of the strip steel between the receiving end and the transmitting end is indicated, namely, the strip steel cannot be detected, at the moment, a tail holding signal of the coiling machine can be generated, so that the coiling machine can carry out tail holding operation.
In the embodiment of the present specification, the accuracy of temperature control can also be improved by improving the temperature detection environment. Specifically, when strip steel is coiled and produced, particularly when low-temperature strip steel with a low coiling temperature is coiled, the target temperature is low, and therefore, water accumulation on the surface of the strip steel causes a large temperature drop. For a laminar cooling system, the laminar cooling system comprises a plurality of groups of rough adjusting collecting pipes of a normal cooling area and a plurality of groups of fine adjusting collecting pipes of a fine cooling area, in the embodiment of the specification, the laminar cooling system comprises 22 groups of collecting pipes, wherein 1-20 groups of collecting pipes are rough adjusting collecting pipes, and 21-22 groups of collecting pipes are fine adjusting collecting pipes. If the laminar cooling water of the former header of 20 groups cannot be effectively purged, the accumulated water on the surface of the strip steel can be always remained in the header area of 21 groups, so that larger cooling temperature drop is caused, the coiling feedback headers of 21 and 22 groups cannot be effectively input, and the temperature fluctuation of the full length of the strip steel is increased.
In order to reduce temperature abnormity and ensure that the investment of the coiling feedback collecting pipe reduces temperature fluctuation, the last group of rough adjusting collecting pipes, namely 20 groups of collecting pipe side spraying is modified, a double-side spray head structure is modified into a three-spray head structure, so that the water sealing effect is greatly improved, 21 groups of collecting pipes are ensured to be invested as feedback control conditions, and the coiling temperature hit rate is improved.
For obtaining a martensite structure for part of steel types such as dual-phase steel, the cooling boiled water amount at the rear end of a layer cooling system is large, if side spraying cannot guarantee effective purging of accumulated water on the surface of strip steel, the water vapor and accumulated water in a pyrometer area are serious, the pyrometer cannot detect the temperature, and the temperature leak detection risk occurs. In order to ensure the water sealing effect, in the embodiment of the specification, the back-spraying devices perpendicular to the length direction of the strip steel are added at the outlets of the last group of collecting pipes of the laminar flow system, and according to the above example, the back-spraying devices perpendicular to the length direction of the strip steel are added at the outlets of 22 groups of collecting pipes to improve the water sealing effect.
In summary, according to the temperature control method for the coiled strip steel provided by the embodiment of the present disclosure, different pyrometers are automatically switched according to different target temperatures of the coiled strip steel, and a pyrometer that better meets a target temperature range is selected to perform temperature acquisition, so that accuracy of temperature acquisition can be ensured, and temperature control of the coiled strip steel is facilitated. Meanwhile, human resources consumed by manual switching are avoided, and errors caused by manual judgment can also be avoided.
In addition, in the embodiment of the specification, the temperature acquisition can be carried out by selecting the low-temperature pyrometer in the treatment process of low-temperature coiled strip steel through the primary and secondary control, the matching of the measuring range of the pyrometer and the target temperature is ensured, and the fluctuation of the strip steel temperature can be contained. Meanwhile, the unloading threshold value of the pyrometer is reduced, the filtering function of a loaded signal is added to the pyrometer, the unloading of the pyrometer caused by external factors is effectively avoided, and the accuracy of temperature control is improved. Further, the cold detection is used for controlling the coiling machine, so that the phenomenon that the coiling machine clamps the tail in advance due to the fact that the pyrometer is unloaded in advance can be effectively avoided.
In the embodiment of the specification, the last group of coarse adjustment collecting pipe spray head structure is improved into a three-spray head structure, and the reverse spraying device is additionally arranged at the laminar cooling outlet, so that the water sealing effect is greatly improved, the accuracy of collecting temperature of the pyrometer is improved, and the hit rate of the coiling temperature is further improved.
As shown in fig. 2, a schematic diagram of a laminar cooling system provided in an embodiment of the present specification, the laminar cooling system includes:
the detection device comprises a first pyrometer 21 and a second pyrometer 22 which are arranged at the outlet of a laminar cooling system, wherein the lowest detection temperature of the first pyrometer 21 is higher than that of the second pyrometer 22, and the highest detection temperature of the first pyrometer 21 is higher than that of the second pyrometer 22;
a controller connected to the first pyrometer 21 and the second pyrometer 22;
the controller is used for acquiring a target temperature for cooling the strip steel; determining a target pyrometer among the first pyrometer 21 and the second pyrometer 22 based on the target temperature and a preset temperature threshold; receiving the temperature of the strip steel collected by a target pyrometer; and adjusting the cooling parameters of the layer cooling system based on the temperature of the strip steel acquired by the target pyrometer and a preset layer cooling control model.
In the embodiment of the description, the laminar cooling system comprises a plurality of groups of rough adjusting collecting pipes in a normal cooling area and a plurality of groups of fine adjusting collecting pipes in a fine cooling area, the spray head structure of the last group of rough adjusting collecting pipes in the normal cooling area is a three-spray head structure, and a reverse spray device is arranged at the outlet of the last group of fine adjusting collecting pipes in the fine cooling area.
In an embodiment of this specification, the layer cooling system further includes a cold detection device, the cold detection device includes a transmitting end and a receiving end, the transmitting end can emit laser, if there is no shielding between the transmitting end and the receiving end, the receiving end can receive the laser emitted by the transmitting end, and if there is shielding between the transmitting end and the receiving end, the receiving end cannot receive the laser.
Specifically, the cold detection device can be arranged in the layer cooling system as required, for example, the cold detection device is arranged at an outlet of the layer cooling system, the transmitting end and the receiving end of the cold detection device can be respectively arranged at two sides of the strip steel, namely, the strip steel runs between the transmitting end and the receiving end, when the receiving end does not receive the laser transmitted by the transmitting end, the normal running of the strip steel is indicated, if the receiving end receives the laser, the situation that the shielding of the strip steel does not exist between the receiving end and the transmitting end is indicated, namely, the strip steel cannot be detected, at this time, a tail holding signal of the recoiling machine can be generated, so that the recoiling machine executes tail holding operation.
With regard to the above-described system, the specific functions of the respective devices and modules have been described in detail in the above-described embodiments of the method for controlling the temperature of a coiled strip, and will not be described in detail here.
As shown in fig. 3, a schematic diagram of a coiled strip temperature control apparatus provided in an embodiment of the present disclosure is a coiled strip temperature control apparatus for controlling a laminar cooling system to cool a hot rolled strip, where a first pyrometer and a second pyrometer are disposed at an outlet of the laminar cooling system, a lowest detection temperature of the first pyrometer is higher than a lowest detection temperature of the second pyrometer, and a highest detection temperature of the first pyrometer is higher than a highest detection temperature of the second pyrometer, and the apparatus includes:
an obtaining module 31, configured to obtain a target temperature for cooling the strip steel;
a pyrometer determining module 32, configured to determine a target pyrometer among the first pyrometer and the second pyrometer based on the target temperature and a preset temperature threshold, and acquire the temperature of the strip steel through the target pyrometer;
and the processing module 33 is configured to adjust the cooling parameters of the layer cooling system based on the temperature of the strip steel acquired by the target pyrometer and a preset layer cooling control model.
Optionally, the temperature acquisition range of the first pyrometer is 300 to 1100 ℃, and the temperature acquisition range of the second pyrometer is 0 to 1000 ℃.
Optionally, a pyrometer determination module 32 for:
determining that the first pyrometer is the target pyrometer through a secondary process control when the target temperature is greater than or equal to the preset temperature threshold;
and when the target temperature is smaller than the preset temperature threshold value, determining that the second pyrometer is the target pyrometer through secondary process control.
Optionally, the system further comprises:
the monitoring module is used for monitoring a pyrometer selection signal through primary basic automation control, wherein the pyrometer selection signal is a signal generated by determining the target high temperature timing in the secondary process control;
and the processing module is used for taking the second pyrometer as the currently running pyrometer through primary basic automatic control when the pyrometer selection signal represents that the currently running pyrometer is the first pyrometer.
Optionally, the unloading temperature of the first pyrometer is 310 ℃ and the unloading temperature of the second pyrometer is 50 ℃.
Optionally, the system further comprises:
the first detection module is used for detecting whether the target pyrometer does not acquire temperature;
the second detection module is used for determining whether the target pyrometer acquires the temperature again within a preset time period when the target pyrometer does not acquire the temperature;
and the pyrometer state determination module is used for determining that the target pyrometer is not unloaded when the target pyrometer reacquires the temperature within a preset time period.
Optionally, a cold detection device is disposed in the laminar cooling system, and the system further includes:
and the coiling control module is used for generating a coiling machine tail-holding signal and sending the coiling machine tail-holding signal to the coiling machine if the cold detection device does not detect the strip steel so as to enable the coiling machine to execute tail-holding operation.
With regard to the above-mentioned apparatus, the specific functions of the respective modules have been described in detail in the embodiments of the method for controlling the temperature of the coiled steel strip provided in the embodiments of the present specification, and will not be described in detail herein.
Based on the inventive concept of the method for controlling the temperature of the coiled steel strip, the embodiment of the specification further provides a computer readable storage medium, on which a computer program is stored, and the computer program realizes the steps of any one of the methods for controlling the temperature of the coiled steel strip when being executed by a processor.
The description has been presented with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the description. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present specification have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all changes and modifications that fall within the scope of the specification.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present specification without departing from the spirit and scope of the specification. Thus, if such modifications and variations of the present specification fall within the scope of the claims of the present specification and their equivalents, the specification is intended to include such modifications and variations.
Claims (9)
1. A temperature control method for coiled strip steel is characterized by being used for controlling a layer cooling system to cool hot rolled strip steel, wherein a first pyrometer and a second pyrometer are arranged at an outlet of the layer cooling system, the lowest detection temperature of the first pyrometer is higher than the lowest detection temperature of the second pyrometer, and the highest detection temperature of the first pyrometer is higher than the highest detection temperature of the second pyrometer, and the method comprises the following steps:
acquiring a target temperature for cooling the strip steel;
determining a target pyrometer from the first pyrometer and the second pyrometer based on the target temperature and a preset temperature threshold, and acquiring the temperature of the strip steel through the target pyrometer;
adjusting the cooling parameters of the laminar cooling system based on the temperature of the strip steel acquired by the target pyrometer and a preset laminar cooling control model;
when the target pyrometer is the second pyrometer, monitoring a pyrometer selection signal through primary basic automation control, wherein the pyrometer selection signal is a signal generated by determining the target pyrometer in secondary process control;
and when the pyrometer selection signal represents that the currently running pyrometer is the first pyrometer, taking the second pyrometer as the currently running pyrometer through primary basic automatic control.
2. The method of claim 1, wherein the temperature of the first pyrometer is collected in a range of 300 to 1100 ℃ and the temperature of the second pyrometer is collected in a range of 0 to 1000 ℃.
3. The method of claim 1, wherein determining a target pyrometer among the first pyrometer and the second pyrometer based on the target temperature and a preset temperature threshold comprises:
determining that the first pyrometer is the target pyrometer through a secondary process control when the target temperature is greater than or equal to the preset temperature threshold;
and when the target temperature is smaller than the preset temperature threshold value, determining that the second pyrometer is the target pyrometer through secondary process control.
4. The method of claim 1, wherein the unloading temperature of the first pyrometer is 310 ℃ and the unloading temperature of the second pyrometer is 50 ℃.
5. The method of claim 1, wherein after determining a target pyrometer among the first pyrometer and the second pyrometer, the method further comprises:
detecting whether the target pyrometer has not acquired temperature;
if the target pyrometer does not acquire the temperature, determining whether the target pyrometer acquires the temperature again within a preset time period;
and if so, determining that the target pyrometer is not unloaded.
6. The method of claim 1, wherein a cold detection device is disposed in the laminar cooling system, the method further comprising:
and if the cold detection device does not detect the strip steel, generating a coiling machine tail holding signal and sending the coiling machine tail holding signal to a coiling machine so as to enable the coiling machine to carry out tail holding operation.
7. The utility model provides a batch belted steel temperature control device, its characterized in that for control layer cooling system cools down hot rolling belted steel, the exit of layer cooling system is provided with first pyrometer and second pyrometer, the minimum detection temperature of first pyrometer is higher than the minimum detection temperature of second pyrometer, the highest detection temperature of first pyrometer is higher than the highest detection temperature of second pyrometer, the device includes:
the acquisition module is used for acquiring the target temperature for cooling the strip steel;
the pyrometer determining module is used for determining a target pyrometer from the first pyrometer and the second pyrometer based on the target temperature and a preset temperature threshold value, and acquiring the temperature of the strip steel through the target pyrometer;
the processing module is used for adjusting the cooling parameters of the laminar cooling system based on the temperature of the strip steel acquired by the target pyrometer and a preset laminar cooling control model;
when the target pyrometer is the second pyrometer, monitoring a pyrometer selection signal through primary basic automation control, wherein the pyrometer selection signal is a signal generated by determining the target pyrometer in secondary process control;
and when the pyrometer selection signal represents that the currently running pyrometer is the first pyrometer, taking the second pyrometer as the currently running pyrometer through primary basic automatic control.
8. A laminar cooling system, characterized in that it comprises:
the detection device comprises a first pyrometer and a second pyrometer which are arranged at an outlet of the laminar cooling system, wherein the lowest detection temperature of the first pyrometer is higher than that of the second pyrometer, and the highest detection temperature of the first pyrometer is higher than that of the second pyrometer;
a controller connected to the first pyrometer and the second pyrometer;
the controller is used for obtaining a target temperature for cooling the strip steel; determining a target pyrometer among the first pyrometer and the second pyrometer based on the target temperature and a preset temperature threshold; receiving the temperature of the strip steel collected by the target pyrometer; adjusting the cooling parameters of the laminar cooling system based on the temperature of the strip steel acquired by the target pyrometer and a preset laminar cooling control model;
when the target pyrometer is the second pyrometer, monitoring a pyrometer selection signal through primary basic automation control, wherein the pyrometer selection signal is a signal generated by determining the target pyrometer in secondary process control;
and when the pyrometer selection signal represents that the currently running pyrometer is the first pyrometer, taking the second pyrometer as the currently running pyrometer through primary basic automatic control.
9. The system of claim 8, wherein the laminar cooling system comprises a plurality of groups of rough adjusting collecting pipes of a normal cooling area and a plurality of groups of fine adjusting collecting pipes of a fine cooling area, the spray head structure of the last group of rough adjusting collecting pipes of the normal cooling area is a three-spray head structure, and a reverse spraying device is arranged at the outlet of the last group of fine adjusting collecting pipes of the fine cooling area.
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| JPH0659493B2 (en) * | 1989-09-26 | 1994-08-10 | 新日本製鐵株式会社 | Rolling mill outlet temperature control method for hot rolled material |
| WO2008093396A1 (en) * | 2007-01-30 | 2008-08-07 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | Temperature control unit of hot rolling machine |
| CN201455050U (en) * | 2009-06-19 | 2010-05-12 | 山西太钢不锈钢股份有限公司 | Band steel position detection device of coiler |
| CN102441578B (en) * | 2011-12-28 | 2013-12-25 | 河北省首钢迁安钢铁有限责任公司 | Method for increasing coiling temperature control accuracy of low temperature steel |
| CN104028561B (en) * | 2014-06-18 | 2017-01-11 | 内蒙古包钢钢联股份有限公司 | Method for guaranteeing final-cooling temperature precision for steel plates |
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