CN109201750B - Hot-rolled low-temperature coiled strip steel surface purging control method based on water area - Google Patents
Hot-rolled low-temperature coiled strip steel surface purging control method based on water area Download PDFInfo
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- CN109201750B CN109201750B CN201710524374.7A CN201710524374A CN109201750B CN 109201750 B CN109201750 B CN 109201750B CN 201710524374 A CN201710524374 A CN 201710524374A CN 109201750 B CN109201750 B CN 109201750B
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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
- B21B37/76—Cooling control on the run-out table
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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
- B21B45/0269—Cleaning
- B21B45/0275—Cleaning devices
- B21B45/0278—Cleaning devices removing liquids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
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Abstract
The invention relates to the field of strip steel surface purging, in particular to a purging control method for the surface of hot-rolled low-temperature coiled strip steel. A hot rolling low temperature coiling strip steel surface purging control method based on water area divides the nozzles of a surface purifying device into a plurality of groups, the gas supply pipe of each group of nozzles is controlled by a purging controller to open and close, an imaging device is arranged between a laminar cooling device and the surface purifying device, then a water area percentage and purging intensity database is established, and the imaging device acquires the surface image of the strip steel; the image analysis device obtains the water area percentage through the surface image; the controller controls the nozzle according to the water area percentage. The invention controls the blowing strength according to the area of the residual water, avoids the current situation that a large amount of compressed air is ineffective blown in the blowing process, ensures the purification effect of the upper surface of the laminar cooling strip steel, simultaneously can avoid the large waste of energy, reduces the energy consumption in the production process and realizes the aim of reducing cost and improving efficiency on site.
Description
Technical Field
The invention relates to the field of strip steel surface purging, in particular to a purging control method for the surface of hot-rolled low-temperature coiled strip steel.
Background
As shown in fig. 1, the existing coiling process of hot-rolled low-temperature strip steel is that the strip steel 1 sequentially passes through a finishing mill frame 2, a laminar cooling device 3, a surface purifying device 4, a temperature measuring device 5 and a coiling device 6, when the strip steel 1 is washed by water of the surface purifying device 4, water is remained, the remained water can affect the temperature measuring precision and the temperature measuring success rate of the temperature measuring device 5, and the temperature is an important index which affects the final quality of the strip steel structure, so that the surface purifying device 4 is arranged to sweep the strip steel 1, compressed air is sprayed out from a nozzle of the surface purifying device 4 to sweep the remained water on the surface of the strip steel 1, and the reliability of temperature measurement of the temperature measuring device 5 is ensured;
when the existing surface purifying device is applied to a hot-rolling laminar flow area, safety factors are considered, scrap steel is prevented from being collided, a certain distance is usually reserved between a nozzle and strip steel, in a purging section of the hot-rolling low-temperature strip steel, the temperature of the strip steel is usually below 500 ℃, purging airflow sprayed by the nozzle is quickly attenuated along with the distance, and a large airflow is needed to achieve a certain purging effect, so that purging energy consumption is greatly increased, and therefore a method capable of accurately controlling purging quantity is needed to reduce energy consumption and meet the requirement of energy conservation.
Disclosure of Invention
The invention aims to solve the technical problem of providing a hot-rolling low-temperature coiled strip steel surface purging control method based on water area, which controls the purging strength according to the residual water area, avoids the current situation that a large amount of compressed air is not effectively purged in the purging process, ensures the purification effect of the upper surface of laminar cooling strip steel, avoids a large amount of waste of energy, reduces the energy consumption in the production process, and realizes the purposes of cost reduction and efficiency improvement on site.
The invention is realized by the following steps: a hot rolling low temperature coiling strip steel surface purging control method based on water area divides the nozzles of a surface purifying device into a plurality of groups, the gas supply pipe of each group of nozzles is controlled by a purging controller to open and close, an imaging device is arranged between a laminar cooling device and the surface purifying device, and then the control is carried out according to the following steps:
s1, establishing a water area percentage and purging intensity database, obtaining the purging intensity required by the surface of the strip steel in each water area percentage through a test, and storing the purging intensity in the database;
water area percent = (strip steel surface residual water area/strip steel surface total area) × 100%
Purge intensity = (number of opened nozzle groups/total number of nozzle groups) × 100%;
s2, the imaging device acquires a surface image of the strip steel and then sends the surface image to an image analysis device;
s3, the image analysis device processes the surface image to obtain the water area percentage and sends the water area percentage to the blowing controller;
and S4, the purging controller checks the corresponding purging strength from the database according to the water area percentage and controls the purging strength of the surface purification device.
In the step S2, the imaging device acquires the surface image of the strip steel every 10-60S.
The imaging device is a camera.
In step S3, the specific steps of processing the surface image by the image analysis device to obtain the water area percentage are to set a gray threshold,
1) the image analysis device converts the surface image from an RGB three-channel color image into a gray single-channel image;
2) smoothing and denoising the gray single-channel image by using a filtering algorithm;
3) and calculating to obtain the water area percentage by taking the pixel points with the gray level larger than the gray level threshold value as water residual points, taking the total area of all the water residual points as the residual water area on the surface of the strip steel and taking the total area of the surface image as the total area of the surface of the strip steel.
The imaging device is a thermal imager.
In step S3, the specific steps of processing the surface image by the image analysis device to obtain the water area percentage are to set a gray threshold,
1) the image analysis device converts the surface image from an RGB three-channel color image into a gray single-channel image;
2) smoothing and denoising the gray single-channel image by using a filtering algorithm;
3) and calculating to obtain the water area percentage by taking the pixel points with the gray level smaller than the gray level threshold value as water residual points, taking the total area of all the water residual points as the residual water area on the surface of the strip steel and taking the total area of the surface image as the total area of the surface of the strip steel.
The hot-rolling low-temperature coiled strip steel surface purging control method based on the water area controls the purging intensity according to the residual water area, avoids the current situation that a large amount of compressed air is not used for purging in the purging process, ensures the purification effect of the upper surface of the laminar cooling strip steel, can also avoid a large amount of energy waste, reduces the energy consumption in the production process, realizes the aim of reducing cost and improving efficiency on site, realizes the accurate control and automatic control of the hot-rolling low-temperature coiled strip steel surface purification device during the online purging work, reduces the equipment use cost, and provides equipment guarantee for improving the temperature measurement precision of the strip steel surface.
Drawings
FIG. 1 is a schematic view of a conventional coiling process of hot-rolled low-temperature strip steel;
FIG. 2 is a schematic reeling flow diagram of a device matched with the hot-rolled low-temperature reeling strip steel surface purging control method based on water area;
FIG. 3 is a control flow diagram of the present invention.
In the figure: 1 strip steel, 2 finishing mill frames, 3 laminar cooling devices, 4 surface purification devices, 5 temperature measuring devices, 6 coiling devices, 7 purging controllers and 8 imaging devices.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes and modifications can be made by one skilled in the art after reading the description of the present invention, and equivalents fall within the scope of the invention defined by the appended claims.
Example 1
As shown in fig. 2 and 3, a method for controlling surface purging of hot-rolled low-temperature coiled strip steel based on water area is characterized in that nozzles of a surface purifying device 4 are divided into a plurality of groups, an air supply pipe of each group of nozzles is controlled to be opened and closed by a purging controller 7, an imaging device 8 is arranged between a laminar cooling device 3 and the surface purifying device 4, and then the control is performed according to the following steps:
s1, establishing a water area percentage and purging intensity database, obtaining the purging intensity required by the surface of the strip steel in each water area percentage through a test, and storing the purging intensity in the database;
water area percent = (strip steel surface residual water area/strip steel surface total area) × 100%
Purge intensity = (number of opened nozzle groups/total number of nozzle groups) × 100%;
s2, the imaging device acquires a surface image of the strip steel and then sends the surface image to an image analysis device; in the invention, because frequent adjustment is not carried out on the purging amount in an actual use environment, and in order to prolong the service life of equipment, the imaging device acquires the surface image of the strip steel every 10-60 s, so that the control requirement can be met;
s3, the image analysis device processes the surface image to obtain the water area percentage and sends the water area percentage to the blowing controller;
and S4, the purging controller checks the corresponding purging strength from the database according to the water area percentage and controls the purging strength of the surface purification device.
In the invention, a matched processing method is adopted for surface images according to different equipment selected by an imaging device, when the imaging device is a camera, an anhydrous area in the surface image of the strip steel 1 is imaged into red with lower brightness, and a reflective surface with higher brightness appears in an area with water; at this time, the specific steps of specifically processing to obtain the water area percentage are setting a gray threshold,
1) the image analysis device converts the surface image from an RGB three-channel color image into a gray single-channel image;
2) due to the fact that the field environment is complex, a large amount of noise can be generated in the process of collecting and transmitting images, and in order to guarantee high contrast of the characteristic edge of the images, the gray single-channel images are smoothed and denoised by a filtering algorithm;
3) and calculating to obtain the water area percentage by taking the pixel points with the gray level larger than the gray level threshold value as water residual points, taking the total area of all the water residual points as the residual water area on the surface of the strip steel and taking the total area of the surface image as the total area of the surface of the strip steel.
When the imaging device is a thermal imager, in the surface image of the strip steel 1 obtained by the imager, the non-water area is a luminous surface with higher brightness, and the water area cannot be correctly imaged on the thermal imager because the contrast difference between the water area and the ambient temperature is larger and is displayed as a black area, and the specific step of specifically processing to obtain the water area percentage is to set a gray threshold value,
1) the image analysis device converts the surface image from an RGB three-channel color image into a gray single-channel image;
2) due to the fact that the field environment is complex, a large amount of noise can be generated in the process of collecting and transmitting images, and in order to guarantee high contrast of the characteristic edge of the images, the gray single-channel images are smoothed and denoised by a filtering algorithm;
3) and calculating to obtain the water area percentage by taking the pixel points with the gray level smaller than the gray level threshold value as water residual points, taking the total area of all the water residual points as the residual water area on the surface of the strip steel and taking the total area of the surface image as the total area of the surface of the strip steel.
Taking the purging control of a certain frame as an example, after the surface purifying device 4, the temperature measuring device 5 and the imaging device 8 are arranged, firstly dividing the nozzles of the surface purifying device 4 into five rows, wherein the five rows of nozzles are arranged at equal intervals along the advancing direction of the strip steel 1; then, performing a field test, wherein the water area percentage is related to the temperature of the strip steel 1, when the temperature of the strip steel 1 is about 200 ℃, the water area percentage obtained by an image analysis device is 90-100%, and at the moment, five rows of nozzles are fully opened, namely, the blowing intensity is 100%, so that the temperature measuring device 5 can smoothly obtain continuous temperature data of the strip steel 1; when the water area percentage obtained by the image analysis device is 70-90%, the four rows of nozzles are required to be opened to ensure that the temperature measuring device 5 can smoothly obtain continuous temperature data of the strip steel 1; when the water area percentage obtained by the image analysis device is 50-70%, three rows of nozzles are required to be opened to ensure that the temperature measuring device 5 can smoothly obtain continuous temperature data of the strip steel 1; when the water area percentage obtained by the image analysis device is 20-50%, two rows of nozzles are required to be opened to ensure that the temperature measuring device 5 can smoothly obtain continuous temperature data of the strip steel 1; when the area percentage of water obtained by the image analysis device is 1-20%, a row of nozzles needs to be opened to ensure that the temperature measurement device 5 can smoothly obtain continuous temperature data of the strip steel 1; when the water area percentage is less than 1%, the temperature measuring device 5 is basically not influenced, and the surface purifying device 4 does not need to be started; after the test data are stored in the database, selection is carried out according to the field condition during production, so that the energy consumption of the surface purifying device 4 and the consumption of compressed air can be greatly reduced.
Claims (4)
1. A hot-rolled low-temperature coiled strip steel surface purging control method based on water area is characterized by comprising the following steps: divide into a plurality of groups with surface purification device's nozzle, a plurality of groups nozzle is equidistant in order along belted steel direction of advance, and each group the air supply line of nozzle is opened and close by the control of purge controller, sets up imaging device between laminar flow cooling device and surface purification device, imaging device is the camera, then controls according to following step:
s1, establishing a water area percentage and purging intensity database, obtaining the purging intensity required by the surface of the strip steel in each water area percentage through a test, and storing the purging intensity in the database;
water area percent = (strip steel surface residual water area/strip steel surface total area) × 100%
Purge intensity = (number of opened nozzle groups/total number of nozzle groups) × 100%;
s2, the imaging device acquires a surface image of the strip steel and then sends the surface image to an image analysis device;
s3, the image analysis device processes the surface image to obtain the water area percentage and sends the water area percentage to the blowing controller;
s4, the purging controller checks the corresponding purging intensity from the database according to the water area percentage and controls the purging intensity of the surface purification device;
in step S3, the specific steps of processing the surface image by the image analysis device to obtain the water area percentage are to set a gray threshold,
1) the image analysis device converts the surface image from an RGB three-channel color image into a gray single-channel image;
2) smoothing and denoising the gray single-channel image by using a filtering algorithm;
3) and calculating to obtain the water area percentage by taking the pixel points with the gray level larger than the gray level threshold value as water residual points, taking the total area of all the water residual points as the residual water area on the surface of the strip steel and taking the total area of the surface image as the total area of the surface of the strip steel.
2. The hot rolled low temperature coiled strip surface purging control method based on water area as claimed in claim 1, characterized by: in the step S2, the imaging device acquires the surface image of the strip steel every 10-60S.
3. A hot-rolled low-temperature coiled strip steel surface purging control method based on water area is characterized by comprising the following steps: divide into a plurality of groups with surface purification device's nozzle, a plurality of groups nozzle is equidistant in order along belted steel direction of advance, and each group the air supply line of nozzle is opened and close by the control of purge controller, sets up imaging device between laminar flow cooling device and surface purification device, imaging device is the thermal imaging appearance, then controls according to following step:
s1, establishing a water area percentage and purging intensity database, obtaining the purging intensity required by the surface of the strip steel in each water area percentage through a test, and storing the purging intensity in the database;
water area percent = (strip steel surface residual water area/strip steel surface total area) × 100%
Purge intensity = (number of opened nozzle groups/total number of nozzle groups) × 100%;
s2, the imaging device acquires a surface image of the strip steel and then sends the surface image to an image analysis device;
s3, the image analysis device processes the surface image to obtain the water area percentage and sends the water area percentage to the blowing controller;
s4, the purging controller checks the corresponding purging intensity from the database according to the water area percentage and controls the purging intensity of the surface purification device;
in step S3, the specific steps of processing the surface image by the image analysis device to obtain the water area percentage are to set a gray threshold,
1) the image analysis device converts the surface image from an RGB three-channel color image into a gray single-channel image;
2) smoothing and denoising the gray single-channel image by using a filtering algorithm;
3) and calculating to obtain the water area percentage by taking the pixel points with the gray level smaller than the gray level threshold value as water residual points, taking the total area of all the water residual points as the residual water area on the surface of the strip steel and taking the total area of the surface image as the total area of the surface of the strip steel.
4. The hot rolled low temperature coiled strip surface purging control method based on water area as claimed in claim 3, characterized by: in the step S2, the imaging device acquires the surface image of the strip steel every 10-60S.
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