CN115339879A - Intelligent conveying and tracking method and system for small long and square billets based on machine vision - Google Patents
Intelligent conveying and tracking method and system for small long and square billets based on machine vision Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G47/00—Article or material-handling devices associated with conveyors; Methods employing such devices
- B65G47/74—Feeding, transfer, or discharging devices of particular kinds or types
- B65G47/82—Rotary or reciprocating members for direct action on articles or materials, e.g. pushers, rakes, shovels
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Abstract
The invention relates to a machine vision-based intelligent long and small square billet conveying and tracking method and system, and belongs to the technical field of intelligent steel billet conveying and tracking. The method comprises the steps of steel pushing inspection, billet supplementing and steel pushing, conveying tracking, traffic control and stokehole identification. The intelligent conveying device solves the problem of intelligent conveying of long and small square billets of a multi-casting machine to one roller way, and can reduce the cost of high-temperature coating consumables by at least 90% under the condition that the current steel billet heat delivery rate is more than 90%, so that the intelligent conveying device has great significance in energy conservation and consumption reduction; and due to the non-contact of machine vision, the system fault probability and the operation and maintenance workload are lower, and the method is easy to popularize and apply.
Description
Technical Field
The invention belongs to the technical field of intelligent conveying and tracking of steel billets, and relates to a method and a system for intelligently conveying and tracking small long billet billets based on machine vision, in particular to a method and a system for intelligently conveying and tracking small long billet billets based on multiple casting machines and single roller ways based on machine vision.
Background
In order to improve the production efficiency and reduce the production cost, the steel billet is an important link from the continuous casting cutting and billet discharging to the heating furnace feeding, and especially how the multi-casting machine realizes the ordered intelligent conveying tracking of the steel billet, reduces the consumable material and the operation and maintenance cost, and reduces the workload of manual operation is a research hotspot. In the aspect of automatic conveying of steel billets of a single casting machine, the traditional mode can be realized by additionally arranging sensors for weighing, length measurement, positioning and the like and an automatic control system; in the aspect of billet tracking, the traditional mode can be realized by carrying out high-temperature paint code spraying and subsequent visual identification on the end faces of the billets one by one. But the above solution has high one-time investment cost and high production failure rate, use cost of consumables such as coating and the like and operation and maintenance cost. In addition, the situation that the automatic conveying of the steel billets is carried out on the multi-casting machine long and small square billets through one roller way at a fast production rhythm is more complex, the conditions of cutting and billet conveying of each casting machine need to be monitored in real time, conveying path planning and traffic control are carried out, otherwise traffic accidents caused by collision of the steel billets of different casting machines are caused, the production rhythm is influenced, and even production or equipment accidents are caused. Therefore, how to overcome the defects of the prior art is a problem to be solved urgently in the technical field of intelligent billet conveying tracking.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method and a system for intelligently conveying and tracking a long billet and a small billet of a multi-casting machine based on machine vision.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a machine vision-based intelligent conveying and tracking method for small long and square billets comprises the following steps:
step (1), steel pushing inspection: detecting whether the quantity of the steel billets in each stack position of the steel billet cooling bed reaches a steel billet pushing component or not by adopting a machine vision algorithm;
step (2), supplementing blanks and pushing steel: calculating the flow number of the billet to be supplemented and the steel pushing starting point position of the steel pusher according to the quantity of the billets lacking in each stack position and the distribution condition of the billets at the lifting baffle plates on all the runners, and then sending a moving instruction to the steel pusher;
step (3), conveying and tracking: tracking the circulation condition of the steel billet on a conveying roller by adopting a machine vision algorithm, and performing virtual spray number with unique identity for each hot-fed steel billet;
step (4), traffic control: performing path planning and traffic control according to the steel billet conveying condition in real time by adopting a machine vision algorithm, and sending control signals to the corresponding ejection control unit and the corresponding conveying control unit to avoid collision of the steel billets;
step (5), furnace front identification: before entering the furnace, the identity of each steel billet is identified and confirmed, the hot-delivery virtual spray number steel billet is tracked by adopting a machine vision algorithm to realize identity identification and confirmation, and the cold-delivery actual spray number steel billet is identified and confirmed by adopting the machine vision algorithm based on a heating furnace front code spraying identification device.
Further, preferably, the method further comprises an offline code spraying step, specifically: and when the steel billets need to be subjected to offline detection or offline stacking, carrying out unique identity number code spraying on the offline steel billets.
Further, preferably, in the step (1), an image threshold segmentation machine vision algorithm is adopted for detecting the number of the steel billets in each stack position of the steel billet cooling bed.
Further, in the step (3), it is preferable that the division of the billet body and the background in the transport tracking divides the acquired video signal into individual image frames, and the division of the billet background and the billet body in the image is performed, that is, the RGB color space is converted into the uniform L × a × b space, and the red color (255,0,0) is converted into the uniform L × a × b space
Yellow (255,255,0) is converted to
White (255 ) is converted to
Let P be a pixel in the converted image and D be the euclidean distance between pixels, the calculation formula is as follows:
the segmentation method comprises the following steps:
in the formula (II) when satisfying
When the pixel value of the division output result is not satisfied, the pixel value of the current P pixel is maintained
Time, division and transportationThe result was found to be 0, and,D PI the color difference value between one pixel of the image after color space conversion and a reference point pixel is obtained; i refers to a pixel after the image is converted from RGB color to Lab color, and this pixel has three components,
representing the first component of an I pixel,
；
a second component representing an I-pixel,
；
a third component representing an I-pixel,
；P L representing the first component of P pixels in the converted image, P a A second component representing P pixels in the converted image, P b A third component representing a P pixel in the converted image; t is a threshold value for controlling the similarity; will be provided with
The other part of the steel billet is divided as a billet body, and the billet conveying tracking is realized by taking the other part as a billet background.
Further, in the step (4), during traffic control, the judgment that the steel billet is in place before the turntable rotates is to judge whether the steel billet reaches a specified position by a machine vision algorithm, wherein the specified position comprises a preset front end position and a preset rear end position, the position of the steel billet is required to be between the front end position and the rear end position, and then the rotation is started.
Further, preferably, in the step (5), the identity recognition of the cold-fed actual spray-number steel billet is confirmed by adopting an image threshold segmentation machine vision algorithm based on a spray-code recognition device in front of the heating furnace.
The invention also provides a machine vision-based intelligent long billet conveying and tracking system, which adopts the machine vision-based intelligent long billet conveying and tracking method, comprises a billet discharging control unit and a conveying control unit, and is characterized by further comprising the following steps:
the system comprises an industrial video machine vision system, an intelligent blank discharging subsystem, an intelligent conveying subsystem, a billboard display system and a robot code spraying system;
the industrial video machine vision system is respectively connected with the intelligent blank discharging subsystem, the intelligent conveying subsystem, the billboard display system and the robot code spraying system;
the intelligent blank ejection subsystem is respectively connected with the blank ejection control unit and the billboard display system;
the intelligent conveying subsystem is respectively connected with the conveying control unit and the billboard display system;
the industrial video machine vision system is used for identifying the position, the length and the identity of the steel billet, respectively transmitting the identification result to the intelligent billet discharging subsystem and the intelligent conveying subsystem, and also used for carrying out virtual number spraying with unique identity for each hot-conveying steel billet;
the intelligent ejection subsystem is used for transmitting baffle lifting and steel pusher movement control signals of steel billet ejection to the ejection control unit for execution according to the position, length and identity information of the steel billet transmitted by the industrial video machine vision system;
the intelligent conveying subsystem is used for transmitting the conveying start/stop and rotation signals of the billet roller way to the conveying control unit for execution according to the position, length and identity information of the billet transmitted by the industrial video machine vision system;
the billboard display system is used for displaying the conditions of the full-flow billet ejection and conveying identified and operated by the industrial video machine vision system, the intelligent ejection subsystem and the intelligent conveying subsystem;
the robot code spraying system is used for carrying out unique identity code spraying on off-line steel billets, and when code spraying is carried out, virtual spray codes of the steel billets are obtained from an industrial video machine vision system for code spraying;
the ejection control unit is used for ejecting steel billets from the casting machine, the action execution control command signals of the lifting of the baffle and the movement of the pusher are from the intelligent ejection subsystem, and the execution results are fed back to the intelligent ejection subsystem after the action execution is finished;
the conveying control unit is used for conveying roller way steel billets, control signals for starting, stopping and rotating the roller way conveying are from the intelligent conveying subsystem, and execution results are fed back to the intelligent conveying subsystem after actions are executed.
Further, preferably, the industrial video machine vision system comprises a plurality of industrial cameras, and the installation positions of the industrial cameras comprise a steel billet cooling bed, a steel moving roller way, a conveying turntable and the upper part of the conveying roller way.
Further, preferably, the billboard display system adopts a digital twin visual mode to provide real-time operation conditions for production line staff monitoring systems, and displays real-time position conditions of steel billets recognized by the industrial video machine vision system, billet discharging conditions of a casting machine of the intelligent billet discharging subsystem and billet roller conveying conditions of the intelligent conveying subsystem.
The virtual spray number corresponds to the actual spray number, and the only digital identity number is carried out on the hot-fed steel billet according to the existing normal actual spray number rule; the machine vision algorithm is used for tracking the circulation condition of the steel billets on the conveying roller way, and the digital serial number generated by each steel billet virtual spray mark is visually displayed to a user in real time in a digital twin mode, namely the virtual spray mark is obtained. When the billets need to be subjected to offline detection or stockpiled, actual code spraying is carried out on the offline billets according to the unique digital identity numbers generated by the virtual spray numbers by utilizing conventional physical spray numbers such as conventional high-temperature coatings or aluminum wires.
Compared with the prior art, the invention has the beneficial effects that:
the invention solves the problem of intelligent conveying of the long and small billet of the multi-casting machine to one roller way, and compared with the prior related technology which realizes automatic conveying of billets or carries out entity code spraying on the billets one by means of various sensors to realize tracking, the invention has low one-time investment cost; and because the hot-conveying steel billet only carries out virtual number spraying, namely the higher the hot-conveying rate is, the lower the average number spraying cost of the steel billet is. Under the condition that the hot delivery rate of the current steel billet mostly exceeds 90 percent, the invention can reduce the cost of high-temperature coating consumables by at least 90 percent, and has great significance for energy conservation and consumption reduction; and due to the non-contact property of machine vision, the system fault probability and the operation and maintenance workload are lower.
Drawings
FIG. 1 is a schematic structural diagram of a long billet and small billet intelligent conveying and tracking system based on machine vision;
FIG. 2 is a flow chart of slab supplementing and steel pushing of the present invention;
FIG. 3 is a schematic diagram illustrating the judgment of the positioning of the billet before the rotation of the turntable during traffic control according to the present invention; wherein, (a) is a calibration schematic diagram, and (b) is a billet schematic diagram;
FIG. 4 is a diagram illustrating a physical layout of an exemplary application of the present invention;
FIG. 5 is a schematic representation of the stokehold identification of the present invention;
wherein: the method comprises the following steps of 1-ejection control unit, 2-conveying control unit, 3-industrial video and visual system thereof, 4-intelligent ejection subsystem, 5-intelligent conveying subsystem, 6-billboard display system and 7-robot code spraying system.
Detailed Description
The present invention will be described in further detail with reference to examples.
It will be appreciated by those skilled in the art that the following examples are illustrative of the invention only and should not be taken as limiting the scope of the invention. The examples do not specify particular techniques or conditions, and are performed according to the techniques or conditions described in the literature in the art or according to the product specifications. The materials or equipment used are not indicated by manufacturers, and all are conventional products available by purchase.
Example 1
A machine vision-based intelligent conveying and tracking method for small long and square billets comprises the following steps:
step (1), steel pushing inspection: detecting whether the quantity of the steel billets in each stack position of the steel billet cooling bed reaches a steel billet pushing component or not by adopting a machine vision algorithm;
step (2), blank supplementing and steel pushing: calculating the flow number of the billet to be supplemented and the steel pushing starting point position of the steel pusher according to the quantity of the billets lacking in each stack position and the distribution condition of the billets at the lifting baffle plates on all the runners, and then sending a moving instruction to the steel pusher;
for example, assuming that the number of the billets at the stacking position is 4, if only 3 billets at the stacking position lack 1 billet at the current time and 1 billet is in the second flow, the pusher starts to push the billets from the second flow;
step (3), conveying and tracking: tracking the circulation condition of the steel billets on the conveying roller way by adopting a machine vision algorithm, and carrying out virtual number spraying with unique identity on each hot-conveyed steel billet;
step (4), traffic control: performing path planning and traffic control according to the billet conveying condition in real time by adopting a machine vision algorithm, and sending control signals to corresponding ejection control units and conveying control units to avoid collision of billets;
step (5), furnace front identification: before entering the furnace, the identity of each steel billet is identified and confirmed, the hot-delivery virtual spray number steel billet is tracked by adopting a machine vision algorithm to realize identity identification and confirmation, and the cold-delivery actual spray number steel billet is identified and confirmed by adopting the machine vision algorithm based on a heating furnace front code spraying identification device.
The invention does not limit the adopted machine vision algorithm, for example, euclidean image segmentation method and morphology are adopted;
the method also comprises a step of off-line code spraying, which specifically comprises the following steps: and when the steel billets need to be subjected to offline detection or offline stacking, carrying out unique identity number code spraying on the offline steel billets.
In the step (1), an image threshold segmentation machine vision algorithm is adopted for detecting the quantity of the steel billets in each stack position of the steel billet cooling bed.
In the step (3), during the conveying and tracking, the division of the billet body and the background divides the collected video signal into separate image frames, and divides the billet background and the billet body in the images, namely, the RGB color space is converted into a uniform L a b space, and the red color 255,0,0 is converted into the image frame
Yellow 255,255,0 is converted into
White 255,255,255 converted to white
Let P be a pixel in the converted image and D be the euclidean distance between pixels, the calculation formula is as follows:
the segmentation method comprises the following steps:
in the formula (II) when satisfying
When the pixel value of the division output result is not satisfied, the pixel value of the current P pixel is maintained
When the result of the division output is 0,D PI the color difference value between one pixel of the image after color space conversion and a reference point pixel is obtained; i refers to a pixel after the image is converted from RGB color to Lab color, and this pixel has three components,
the first component of the I pixel is represented,
；
a second component representing an I-pixel,
；
a third component representing an I-pixel,
；P L representing the first component of P pixels in the converted image, P a A second component representing P pixels in the converted image, P b A third component representing a P pixel in the converted image; t is a threshold value for controlling the similarity; will be provided with
The other part of the steel billet is divided as a billet body, and the billet conveying tracking is realized by taking the other part as a billet background.
In the step (4), during traffic control, the judgment that the steel billet is in place before the turntable rotates judges whether the steel billet reaches the specified position through a machine vision algorithm, wherein the specified position comprises a preset front end position and a preset rear end position, the steel billet is required to be positioned between the front end position and the rear end position, and then the rotation is started.
And (5) carrying out identity recognition and confirmation on the cold-fed actual spray number steel billet by adopting an image threshold segmentation machine vision algorithm based on a heating stokehole spray code recognition device.
In the invention, the default of the initial value T is 100, and a proper numerical value can be debugged and set according to the actual conditions of light and environment in different areas on site.
The invention also provides a machine vision-based intelligent conveying and tracking system for the small long square billets, which adopts the machine vision-based intelligent conveying and tracking method for the small long square billets, and comprises a billet ejection control unit 1 and a conveying control unit 2, and is characterized by further comprising the following steps:
an industrial video machine vision system 3, an intelligent ejection subsystem 4, an intelligent conveying subsystem 5, a billboard display system 6 and a robot code spraying system 7, as shown in fig. 1;
the industrial video machine vision system 3 is respectively connected with the intelligent blank discharging subsystem 4, the intelligent conveying subsystem 5, the billboard display system 6 and the robot code spraying system 7;
the intelligent ejection subsystem 4 is respectively connected with the ejection control unit 1 and the billboard display system 6;
the intelligent conveying subsystem 5 is respectively connected with the conveying control unit 2 and the billboard display system 6;
the industrial video machine vision system 3 is used for identifying the position, the length and the identity of the steel billet, respectively transmitting the identification result to the intelligent ejection subsystem 4 and the intelligent conveying subsystem 5, and also used for carrying out virtual number spraying with unique identity for each hot-conveying steel billet;
the intelligent ejection subsystem 4 is used for transmitting baffle lifting and pusher movement control signals of billet ejection to the ejection control unit 1 for execution according to the position, length and identity information of the billets transmitted by the industrial video machine vision system 3;
the intelligent conveying subsystem 5 is used for transmitting the conveying start/stop and rotation signals of the billet roller way to the conveying control unit 2 for execution according to the position, length and identity information of the billet transmitted by the industrial video machine vision system 3;
the billboard display system 6 is used for displaying the conditions of all-flow billet ejection and conveying identified and operated by the industrial video machine vision system 3, the intelligent ejection subsystem 4 and the intelligent conveying subsystem 5;
the robot code spraying system 7 is used for carrying out unique identity code spraying on off-line steel billets, and when code spraying is carried out, virtual spray codes of the steel billets are obtained from the industrial video machine vision system 3 and code spraying is carried out;
the ejection control unit 1 is used for ejecting steel billets from the casting machine, the action execution control command signals of baffle lifting and steel pusher moving are from the intelligent ejection subsystem 4, and the execution result is fed back to the intelligent ejection subsystem 4 after the action execution is finished;
the conveying control unit 2 is used for conveying roller way steel billets, control signals for starting, stopping and rotating the roller way conveying are from the intelligent conveying subsystem 5, and execution results are fed back to the intelligent conveying subsystem 5 after actions are executed.
The industrial video machine vision system 3 comprises a plurality of industrial cameras, and the installation positions of the industrial cameras comprise a steel billet cooling bed, a steel moving roller way, a conveying turntable and the upper part of the conveying roller way.
The billboard display system 6 adopts a digital twin visual mode to provide real-time operation conditions for a production line staff monitoring system, and displays the real-time position conditions of the steel billets identified by the industrial video machine vision system 3, the steel billet ejection conditions of the casting machine of the intelligent ejection subsystem 4 and the steel billet roller way conveying conditions of the intelligent conveying subsystem 5.
Example 2
The machine vision-based intelligent conveying and tracking method for the long and small square billets of the multi-casting machine comprises the following steps of: push away the steel inspection, mend the base and push away the steel, the off-line spouts a yard, carries tracking, traffic control, stokehold discernment specifically is:
and (3) steel pushing inspection: detecting whether the quantity of the steel billets in each stack position of the steel billet cooling bed reaches a steel billet pushing component or not by adopting a machine vision algorithm;
b, blank supplementing and steel pushing: calculating the flow number of the billet to be supplemented and the steel pushing starting point position of the steel pusher according to the quantity of the billets lacking in each stack position and the distribution condition of the billets at the lifting baffle plates on all the runners, and then sending a moving instruction to the steel pusher;
and (5) offline code spraying: when the steel billets cannot be eaten by the heating furnace due to the quality problem and the off-line detection is needed or other reasons cause the steel billets to be conveyed, and the steel billets need to be stocked off-line, unique identity number code spraying is carried out on the off-line steel billets;
conveying and tracking: tracking the circulation condition of the steel billets on a conveying roller way by adopting a machine vision algorithm, and performing virtual spraying with unique identity for each hot-fed steel billet (only the steel billet which is off-line is actually sprayed);
traffic control: performing path planning and traffic control according to the billet conveying condition in real time by adopting a machine vision algorithm, and sending control signals to corresponding ejection control units and conveying control units to avoid traffic accidents such as collision of billets and the like;
furnace front identification: before entering the furnace, the identity of each steel billet is identified and confirmed, the hot-delivery virtual spray number steel billet realizes the identity identification and confirmation by means of the online full-flow industrial camera machine vision tracking, and the cold-delivery actual spray number steel billet realizes the identity identification and confirmation by means of the heating furnace front code spraying recognition device machine vision.
A long material billet intelligent conveying tracking system based on machine vision comprises: the device comprises a blank ejection control unit 1, a conveying control unit 2, an industrial video machine vision system 3, an intelligent blank ejection subsystem 4, an intelligent conveying subsystem 5, a billboard display system 6 and a robot code spraying system 7.
The ejection control unit 1 and the conveying control unit 2 are self-provided industrial control systems for ejection and roller conveying of the original casting machine, and adaptive transformation is carried out;
the industrial video machine vision system 3 comprises a plurality of industrial cameras (preferably, one industrial camera is mounted every 10 meters) mounted along the full process of a steel billet cooling bed, a steel moving roller way, a conveying turntable and a conveying roller way, and is used for identifying the position, the length and the identity of a steel billet and respectively informing the related results to the intelligent knockout subsystem 4 and the intelligent conveying subsystem 5;
the intelligent ejection subsystem 4 and the intelligent conveying subsystem 5 are intelligent subsystems which respectively correspond to ejection and conveying of steel billets;
the billboard display system 6 is responsible for displaying the conditions of all-process billet ejection and conveying identified and operated by the industrial video machine vision system 3, the intelligent ejection subsystem 4 and the intelligent conveying subsystem 5, and the real-time operation condition of the production line employee monitoring system is provided in a digital twin visual mode;
and the robot code spraying system 7 is responsible for carrying out unique identity code spraying on off-line steel billets.
Examples of the applications
A machine vision-based intelligent conveying and tracking method for long and small square billets of a multi-casting machine is mainly characterized by comprising the following steps as shown in figure 4: steel pushing inspection, blank supplementing and steel pushing, offline code spraying, conveying tracking, traffic control and stokehole identification. Wherein, the steel pushing inspection, the slab supplementing and the steel pushing are shown in a slab supplementing and steel pushing process diagram in figure 2.
In fig. 4, A1# to E4# are all industrial cameras; the industrial camera and each tracking main body jointly form an industrial video machine vision system; the automatic ejection main machines 1# and 2# belong to an ejection subsystem 4; the continuous casting machine, the cooling bed, the PLC, the roller way and the like are pre-transformation equipment or systems and belong to a knockout control unit or a conveying control unit
And (5) carrying out steel pushing inspection. And (3) detecting whether the quantity of the steel billets in each stack position of the steel billet cooling bed meets the steel pushing condition or not by means of machine vision, and referring to industrial cameras A1#, A2#, A3#, A4# or B1#, B2#, B3#, and B4#.
And the blank supplementing and steel pushing are carried out. And calculating the stream number of the billet to be supplemented and the steel pushing starting point position of the steel pusher according to the number of the billets lacking in each stack position and the distribution condition of the billets at the lifting baffle positions on all the flow channels, and sending an instruction for opening the lifting baffle for the stream to be supplemented. The billet enters the knockout roller way through the lifting baffle. And after the steel billet completely leaves the lifting baffle area, closing the lifting baffle, and then sending a moving instruction to the pusher, which is shown in a steel moving area of FIG. 4.
And printing codes on the lower line. When the steel billets need offline detection due to quality problems or the heating furnace cannot eat hot steel billets due to other reasons (such as a fault of a rolling mill), and the steel billets need to be offline and stacked, a code spraying robot installed at the offline position of the cooling bed is responsible for carrying out unique identity code spraying on the offline steel billets, and the figure of the cooling bed area is 4.
And the conveying is tracked. The machine vision full-flow tracking method of the industrial cameras additionally arranged along the conveying roller way tracks the flowing condition of the steel billets on the conveying roller way, and performs virtual number spraying of unique identity for each hot-conveying steel billet (only the steel billet which is off line actually performs number spraying), and the method is shown in all roller way conveying parts of fig. 4.
The traffic control. Setting a timestamp for the steel billet reaching the steel pushing area in each flow according to the pulling speed of a casting machine in real time, estimating the arrival time of the subsequent steel billet in each flow, sequencing the fastest arrival flow channel and the slowest arrival flow channel, and automatically deducing the billet delivery efficiency of all conditions by a system according to a traffic light model taking non-blockage and minimum temperature drop as targets to carry out path planning and traffic control (note: the model takes the minimum temperature drop and the reduction of energy consumption as targets without blockage of the steel billet on the roller way), thereby avoiding traffic accidents such as collision of the steel billets. As shown in fig. 4, when the # 2 turntable is automatically conveying the # 2 continuous casting machine billet, the roller way between the # 1 turntable and the # 2 turntable is in a conveying stop state; when the No. 2 turntable is in a horizontal state and can convey the steel billets of the No. 3 continuous casting machine, the roller way between the No. 1 turntable and the No. 2 turntable automatically conveys the steel billets to the No. 2 turntable, and after the machine visually judges that the steel billets are completely parked in place on the No. 2 turntable, a 90-degree rotation command is sent to the No. 2 turntable, and then the steel billets are automatically conveyed to the heating furnace.
And identifying the furnace front. Before entering the furnace, the identity of each steel billet is identified and confirmed, and the hot-delivery virtual spray number steel billet realizes identity identification and confirmation by means of online full-flow industrial camera machine vision tracking; the cold-conveying actual number-spraying steel billet realizes identity recognition and confirmation by means of machine vision of a code spraying recognition device in front of a heating furnace, as shown in figure 5.
The number of the steel billets is realized by adopting an image threshold segmentation machine vision algorithm, namely, the image gray scale is divided into different levels, and then a method for setting a gray scale threshold (threshold) is used for determining a meaningful area or a boundary of a segmentation object. When the brightness difference between the target billet and the background object in the image is smaller, the double-peak characteristic of the image gray level histogram observed from the histogram is not obvious, and a proper threshold value is not easy to determine by directly using the histogram, so that a discriminant analysis method for calculating 0-order moment and 1-order moment of the histogram is used for determining the optimal threshold value.
Setting the total pixel number of the image as N and the gray value as i
Expressed, the 0-order matrix and the 1-order matrix of the gray distribution with the gray level K are respectively defined as follows:
the 0 th moment is:
the 1 st order moment is:
。
when K = L-1, the signal strength of the signal is,
wherein L is the image gray level and L-1 is the maximum value thereof;
wherein, in the process,
is the average gray value of the image. L-1 represents the maximum value when the image gray level is L, and the value range is 0 to 255 if the image gray level L is 256.
Let M-1 thresholds of the image be:
dividing the image into classes of M gray values
And is and
then of each kind
The occurrence probability of (a) is:
and the corresponding probability average is:
，（
) Therefore, the inter-class variance of each class can be obtained as:
in the form of a handle
Set of thresholds with maximum value
As the optimal set of thresholds for M-valuing. When the classification is made into 2 classes, that is, when M is 2, a threshold value for binarization can be obtained.
The judgment of the in-place of the steel billet before the rotation of the turntable is to judge whether the steel billet reaches the designated position through machine vision, the judgment comprises a front position and a rear position, the steel billet is required not to exceed the front end and the rear end of the position, the rotation is started when the steel billet is just positioned between the designated positions, mark positions A and B are arranged in a template image, and as shown in figure 3, the judgment is realized by adopting image segmentation and a morphological post-processing machine vision algorithm.
During the tracking of the billet in the roller conveying process, the division of the body and the background divides the collected video signal into separate image frames, and divides the billet background and the billet body in the image, namely, the RGB color space is converted into the uniform L a b space, and the color is recorded into the color of red (255,0,0) after being converted into the color of the uniform L a b space
Yellow (255,255,0) is converted to
White (255 ) is converted to
Let P be a pixel in the converted image and D be the Euclidean distance between pixels, according to the formula
Then, the segmentation strategy is:
wherein the meaning of the expression is that when the condition is satisfied, the pixel value of the segmentation output result keeps the pixel value of the current P pixel, and when the condition is not satisfied, the segmentation output result is 0, and the DPI means that the color space is converted between one pixel of the image and the pixel of the reference pointThe color difference value of (a); i refers to a pixel of an image converted from RGB to Lab color, the pixel having three components: (
Representing the first component of an I pixel,
；
a second component representing an I-pixel,
；
a third component representing an I-pixel,
；P L representing the first component of the P pixels in the converted image, P a A second component representing P pixels in the converted image, P b The third component representing P pixels in the converted image), T is a threshold value that controls the degree of similarity. Will be provided with
The other part of the steel billet is divided as a billet body, and the billet conveying tracking is realized by taking the other part as a billet background.
A steel billet intelligent conveying tracking system based on machine vision mainly comprises a billet discharging control unit 1, a conveying control unit 2, an industrial video machine vision system 3, an intelligent billet discharging subsystem 4, an intelligent conveying subsystem 5, a billboard display system 6 and a robot code spraying system 7 as shown in figure 1.
The ejection control unit 1 and the conveying control unit 2 are self-provided industrial control systems for ejection and roller conveying of the original casting machine, and adaptive transformation is carried out, such as an automatic ejection and automatic conveying main machine shown in fig. 4.
The industrial video machine vision system 3 comprises a plurality of industrial cameras which are arranged along the whole process of a steel billet cooling bed, a steel moving roller way, a conveying turntable and a conveying roller way, wherein 1 industrial camera is arranged on the average per 10 meters and used for identifying the position, the length and the identity of a steel billet and informing the related results to the intelligent ejection subsystem 4 and the intelligent conveying subsystem 5 respectively;
the intelligent ejection subsystem 4 and the intelligent conveying subsystem 5 are intelligent subsystems which respectively correspond to ejection and conveying of steel billets;
the billboard display system 6 is responsible for displaying the conditions of all-process billet ejection and conveying identified and operated by the industrial video machine vision system 3, the intelligent ejection subsystem 4 and the intelligent conveying subsystem 5, and the real-time operation condition of the production line employee monitoring system is provided in a digital twin visual mode;
and the robot code spraying system 7 is responsible for carrying out unique identity code spraying on off-line steel billets.
The foregoing shows and describes the general principles, principal features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. The intelligent conveying and tracking method for the small rectangular billet of the long material based on the machine vision is characterized by comprising the following steps of:
step (1), steel pushing inspection: detecting whether the quantity of the steel billets in each stack position of the steel billet cooling bed reaches a steel billet pushing component or not by adopting a machine vision algorithm;
step (2), blank supplementing and steel pushing: calculating the stream number of the billet to be supplemented and the steel pushing starting point position of the steel pusher according to the number of the billets lacking in each stack position and the distribution condition of the billets at the lifting baffle plates on all the runners, and then sending a moving instruction to the steel pusher;
step (3), conveying and tracking: tracking the circulation condition of the steel billet on a conveying roller by adopting a machine vision algorithm, and performing virtual spray number with unique identity for each hot-fed steel billet;
step (4), traffic control: performing path planning and traffic control according to the steel billet conveying condition in real time by adopting a machine vision algorithm, and sending control signals to the corresponding ejection control unit and the corresponding conveying control unit to avoid collision of the steel billets;
step (5), furnace front identification: before entering the furnace, the identity of each steel billet is identified and confirmed, the hot-delivery virtual spray number steel billet is tracked by adopting a machine vision algorithm to realize identity identification and confirmation, and the cold-delivery actual spray number steel billet is identified and confirmed by adopting the machine vision algorithm based on a heating furnace front code spraying identification device.
2. The machine vision-based intelligent conveying and tracking method for the small rectangular billet of the long wood according to claim 1, characterized by further comprising an off-line code spraying step, specifically comprising: and when the steel billets need to be subjected to offline detection or offline stacking, carrying out unique identity number code spraying on the offline steel billets.
3. The machine vision-based intelligent long billet conveying and tracking method according to claim 1, wherein in the step (1), an image threshold segmentation machine vision algorithm is adopted for detecting the number of the billets in each stacking position of the billet cooling bed.
4. The intelligent transportation tracking method for long and small billet based on machine vision as claimed in claim 1, wherein in the step (3), during transportation tracking, the segmentation of the billet body and the background is to segment the collected video signal into separate image frames, segment the billet background and the billet body in the image, namely, the RGB color space is converted into a uniform L a b space, and the red color is converted into a red color (255,0,0) which is then converted into the uniform L a b space
Yellow (255,255,0) is converted to
White (255 ) is converted to
Let P be a pixel in the converted image and D be the euclidean distance between pixels, the calculation formula is as follows:
the segmentation method comprises the following steps:
in the formula (II) when satisfying
When the pixel value of the division output result is not satisfied, the pixel value of the current P pixel is maintained
When the result of the division output is 0,D PI the color difference value between one pixel of the image after color space conversion and a reference point pixel is referred to; i refers to a pixel after the image is converted from RGB color to Lab color, and this pixel has three components,
the first component of the I pixel is represented,
；
second representing I pixelThe number of the components is such that,
；
a third component representing an I-pixel,
；P L representing the first component of P pixels in the converted image, P a A second component representing P pixels in the converted image, P b A third component representing a P pixel in the converted image; t is a threshold value for controlling the similarity; will be provided with
The other part of the steel billet is divided as a billet body, and the billet conveying tracking is realized by taking the other part as a billet background.
5. The machine vision-based intelligent conveying and tracking method for the long and small billet as claimed in claim 1, wherein in the step (4), during traffic control, the judgment that the billet is in place before the turntable rotates is to judge whether the billet reaches a specified position by a machine vision algorithm, wherein the specified position comprises a preset front end position and a preset rear end position, the position of the billet is required to be between the front end position and the rear end position, and then the rotation is started.
6. The machine vision-based intelligent long billet conveying and tracking method according to claim 1, wherein in the step (5), the cold-fed actual spray-number billet is subjected to identity recognition and confirmation by adopting an image threshold segmentation machine vision algorithm based on a heating stokehole spray code recognition device.
7. A machine vision-based intelligent transportation tracking system for long billet billets, which adopts the machine vision-based intelligent transportation tracking method for long billet billets claimed in claim 1~6, and comprises a billet ejection control unit (1) and a transportation control unit (2), and is characterized by further comprising:
the automatic blank ejection system comprises an industrial video machine vision system (3), an intelligent blank ejection subsystem (4), an intelligent conveying subsystem (5), a billboard display system (6) and a robot code spraying system (7);
the industrial video machine vision system (3) is respectively connected with the intelligent blank discharging subsystem (4), the intelligent conveying subsystem (5), the billboard display system (6) and the robot code spraying system (7);
the intelligent ejection subsystem (4) is respectively connected with the ejection control unit (1) and the billboard display system (6);
the intelligent conveying subsystem (5) is respectively connected with the conveying control unit (2) and the billboard display system (6);
the industrial video machine vision system (3) is used for identifying the position, the length and the identity of the steel billet, respectively transmitting the identification result to the intelligent ejection subsystem (4) and the intelligent conveying subsystem (5), and also used for carrying out virtual spraying number with unique identity for each hot-conveyed steel billet;
the intelligent ejection subsystem (4) is used for transmitting the baffle lifting and pusher movement control signals of the ejection of the billets to the ejection control unit (1) for execution according to the position, the length and the identity information of the billets transmitted by the industrial video machine vision system (3);
the intelligent conveying subsystem (5) is used for transmitting signals of starting, stopping and rotating the conveying of the steel billet roller way to the conveying control unit (2) for execution according to the position, length and identity information of the steel billet transmitted by the industrial video machine vision system (3);
the billboard display system (6) is used for displaying the conditions of all-flow billet ejection and conveying identified and operated by the industrial video machine vision system (3), the intelligent ejection subsystem (4) and the intelligent conveying subsystem (5);
the robot code spraying system (7) is used for carrying out unique identity code spraying on off-line steel billets, and when code spraying is carried out, virtual spray codes of the steel billets are obtained from the industrial video machine vision system (3) and code spraying is carried out;
the ejection control unit (1) is used for ejecting steel billets from the casting machine, the action execution control command signals of baffle lifting and steel pusher moving are from the intelligent ejection subsystem (4), and the execution results are fed back to the intelligent ejection subsystem (4) after the action execution is finished;
the conveying control unit (2) is used for conveying roller way steel billets, control signals of starting, stopping and rotating of roller way conveying are derived from the intelligent conveying subsystem (5), and execution results are fed back to the intelligent conveying subsystem (5) after actions are executed.
8. The intelligent long billet conveying and tracking system based on machine vision as claimed in claim 7, wherein the industrial video machine vision system (3) comprises a plurality of industrial cameras, and the installation positions of the industrial cameras comprise a billet cooling bed, a steel moving roller way, a conveying turntable and a position above the conveying roller way.
9. The machine vision-based intelligent long billet conveying and tracking system according to claim 7, wherein the billboard display system (6) adopts a digital twin visualization mode to provide real-time running conditions for production line staff monitoring systems, and displays real-time position conditions of billets recognized by the industrial video machine vision system (3), billet discharging conditions of a casting machine of the intelligent billet discharging subsystem (4), and billet roller conveying conditions of the intelligent conveying subsystem (5).
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