Method and system for measuring casting blank charging position image of steel rolling heating furnace

Abstract

The invention relates to a steel rolling heating furnace casting blank charging position image measurement method and system, and belongs to the technical field of steel rolling. The technical scheme is as follows: a camera A (5) and a camera B (6) are respectively fixed at the positions of a steel billet head and a steel billet tail in front of a heating furnace, and images of the two cameras are loaded on a computer (1); when a steel billet passes through the laser positioner (2), the state of a limit switch changes, after a roller way stops and the steel billet reaches a designated position in front of a heating furnace door, the system grabs images of the camera A (5) and the camera B (6) at the current moment, the positions of a steel billet head and a steel billet tail are intercepted in the images, and the length of the steel billet is calculated according to a programmed algorithm; and finally, a length calculation result is transmitted to the PLC. The method has the beneficial effects that the damage of the heating furnace door and the failure of subsequent procedures caused by the unqualified production length of the steel billet are avoided, the occurrence of safety accidents is effectively avoided, and the production safety and the production efficiency are improved.

Description

Technical Field

[0001] The invention relates to a method and system for measuring images of billet charging positions in a steel rolling heating furnace, belonging to the technical field of steel rolling. Background Art

[0002] Length is one of the basic dimensions of steel billets and has a great impact on the entire steel manufacturing process. Measuring the length of steel billets helps ensure that there will be no production accidents in subsequent production. Steel billets with unqualified length may cause damage to the heating furnace door when entering the heating furnace, thereby affecting the production process of the steel billets. Existing technologies mostly use manual measurement, which poses certain safety risks in high-temperature production environments. Automatic measurement can reduce the time workers are exposed to dangerous environments and avoid possible economic losses and safety accidents. Automatic measurement of steel billet length can reduce workload and improve production efficiency. Summary of the invention

[0003] The purpose of the present invention is to provide a method and system for image measurement of the billet loading position of a steel rolling heating furnace, which can automatically measure the length of the billet passing through the track, avoid damage to the heating furnace door and failure of subsequent processes due to unqualified production length of the billet, prevent excessively long billets from damaging the heating furnace door when entering the heating furnace, effectively avoid the occurrence of safety accidents, improve production safety and production efficiency, and solve the above-mentioned technical problems existing in the existing technology.

[0004] The technical solution of the present invention is: A system for measuring the image of the billet loading position of a steel rolling heating furnace comprises a computer, a laser locator, a right arrow, a left arrow, a camera A and a camera B. The laser locator is installed at the position where the billet is about to arrive in front of the heating furnace door, the right arrow is fixed at the position where the tail of the billet is located in front of the heating furnace, the left arrow is fixed at the position where the head of the billet is located in front of the heating furnace, the camera A and the camera B are fixed at the positions where the head and the tail of the billet are located in front of the heating furnace respectively, and the images of the two cameras are loaded on the computer; when the billet passes through the laser locator, the state of the limit switch changes, and after waiting for the roller to stop, the billet arrives at the specified position in front of the heating furnace door, the system captures the images of the cameras A and B at the current moment, intercepts the positions of the billet head and the billet tail in the image, calculates the length of the billet according to the program algorithm, and finally transmits the length calculation result to the PLC.

[0005] A method for measuring the image of the billet loading position in a steel rolling heating furnace adopts the above-mentioned system for measuring the image of the billet loading position in a steel rolling heating furnace, and is characterized in that: when the billet passes through a laser locator, the operating signals of the on-site PLC laser locator and the roller motor are collected, that is, the falling edge of the laser locator, and after waiting for a period of time, the on-site roller motor stops, and the billet reaches the specified position in front of the heating furnace door, and the images of the two cameras are intercepted and processed.

[0006] The image data captured by camera A and camera B are read, and the areas where the edges of the billet head and the billet tail are located are selected in the image; the boundary X-axis coordinate X_L_L on the left side of the heating furnace is determined according to the center point of the tail of the right-pointing arrow, and the boundary X-axis coordinate X_L_R on the right side of the heating furnace is determined according to the center point of the tail of the left-pointing arrow; in the selected image area, a brightness change threshold is set, and multiple horizontal line segments are determined according to the position of the center point of the tail of the arrow to obtain the brightness change on these line segments, find the X coordinate whose brightness change difference is greater than or equal to the set brightness change threshold, and record it in a list for statistics and analysis.

[0007] If the number of X coordinates that meet the requirements is greater than or equal to 5, and the number of times the mode X coordinate appears is greater than or equal to 3 times, then this X coordinate is taken as the billet head position or billet tail position; if the number of X coordinates that meet the requirements is less than 5, and the number of times the mode X coordinate appears is greater than or equal to 2 times, then this X coordinate is taken as the billet head position or billet tail position, and the data recorded in the list are processed by the method described above to obtain the billet head position X_G_R and the billet tail position X_G_L.

[0008] Subtract the estimated pixel to the heating furnace door position from the recorded X coordinate, and multiply by the distance X_D corresponding to one pixel point, then calculate the distance L_R between the head of the billet and the boundary of the heating furnace and the distance L_L between the tail of the billet and the boundary of the heating furnace. Use the distance L between the two edges of the heating furnace minus the distance between the head and the tail of the billet and the boundary of the heating furnace to obtain the billet length L_G; L_R= (X_G_R-X_L_R)*X_D L_L= (X_G_L-X_L_L)*X_D L_G = LL _R-L _L After the system calculates the length of the billet, it sends the billet length information to the PLC.

[0009] The beneficial effects of the present invention are as follows: it can realize automatic measurement of the length of the steel billet passing through the track, thereby avoiding damage to the heating furnace door and failure of subsequent processes due to unqualified production length of the steel billet, preventing excessively long steel billets from damaging the heating furnace door when entering the heating furnace, effectively avoiding the occurrence of safety accidents, and improving production safety and production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 The overall flow chart for the implementation of the present invention is as follows; Figure 2 Calculate the logic flow chart for the embodiment of the present invention; Figure 3 It is a schematic diagram of the position installation of an embodiment of the present invention; Figure 4 It is a system diagram of an embodiment of the present invention; In the figure: computer 1, laser locator 2, right arrow 3, left arrow 4, camera A5, camera B6, laser positioning point 7, heating furnace 8, roller table 9, PLC 10. DETAILED DESCRIPTION

[0011] The present invention will be further described below by way of embodiments in conjunction with the accompanying drawings.

[0012] A system for measuring the image of the billet loading position in a steel rolling heating furnace comprises a computer (1), a laser locator (2), a right arrow (3), a left arrow (4), a camera A (5) and a camera B (6). The laser locator (2) is installed at a position where the billet is about to arrive in front of a door of a heating furnace 8, the right arrow (3) is fixed at the position where the tail of the billet is located in front of the heating furnace, the left arrow (4) is fixed at the position where the head of the billet is located in front of the heating furnace, the camera A (5) and the camera B (6) are fixed at the positions where the head and the tail of the billet are located in front of the heating furnace respectively, and the images of the two cameras are loaded on the computer (1); when the billet passes through the laser locator (2), the state of the limit switch changes, and after the roller 9 stops, the billet arrives at a specified position in front of the heating furnace door, the system captures the images of the cameras A (5) and B (6) at the current moment, intercepts the positions of the billet head and the billet tail in the images, calculates the length of the billet according to a program algorithm, and finally transmits the length calculation result to a PLC 10.

[0013] The laser locator 2 is installed at the position of the laser locating point 7.

[0014] A method for measuring the image of the billet loading position in a steel rolling heating furnace, using the above-mentioned system for measuring the image of the billet loading position in the steel rolling heating furnace, is characterized in that: when the billet passes through a laser locator (2), the operating signals of the on-site PLC laser locator (2) and the roller motor are collected, that is, the falling edge of the laser locator (2), after waiting for a period of time, the on-site roller motor stops, the billet reaches the specified position in front of the heating furnace door, the images of the two cameras are intercepted, and the two images are processed.

[0015] The image data captured by camera A and camera B are read, and the areas where the edges of the billet head and the billet tail are located are selected in the image; the boundary X-axis coordinate X_L_L on the left side of the heating furnace is determined according to the center point of the tail of the right-pointing arrow, and the boundary X-axis coordinate X_L_R on the right side of the heating furnace is determined according to the center point of the tail of the left-pointing arrow; in the selected image area, a brightness change threshold is set, and multiple horizontal line segments are determined according to the position of the center point of the tail of the arrow to obtain the brightness change on these line segments, find the X coordinate whose brightness change difference is greater than or equal to the set brightness change threshold, and record it in a list for statistics and analysis.

[0016] The brightness change threshold threshold = 25.

[0017] If the number of X coordinates that meet the requirements is greater than or equal to 5, and the number of times the mode X coordinate appears is greater than or equal to 3 times, then this X coordinate is taken as the billet head position or billet tail position; if the number of X coordinates that meet the requirements is less than 5, and the number of times the mode X coordinate appears is greater than or equal to 2 times, then this X coordinate is taken as the billet head position or billet tail position, and the data recorded in the list are processed by the method described above to obtain the billet head position X_G_R and the billet tail position X_G_L.

[0018] Subtract the estimated pixel to the heating furnace door position from the recorded X coordinate, and multiply by the distance X_D corresponding to one pixel point, then calculate the distance L_R between the head of the billet and the boundary of the heating furnace and the distance L_L between the tail of the billet and the boundary of the heating furnace. Use the distance L between the two edges of the heating furnace minus the distance between the head and the tail of the billet and the boundary of the heating furnace to obtain the billet length L_G; L_R= (X_G_R-X_L_R)*X_D L_L= (X_G_L-X_L_L)*X_D L_G = LL _R-L _L After the system calculates the length of the billet, it sends the billet length information to the PLC.

Claims

1. A system for measuring the image of the billet loading position in a steel rolling heating furnace, characterized in that: The system comprises a computer (1), a laser locator (2), a right arrow (3), a left arrow (4), a camera A (5) and a camera B (6), wherein the laser locator (2) is installed at a position where the billet is about to reach the front of the heating furnace door, the right arrow (3) is fixed at the position where the tail of the billet is located in front of the heating furnace, the left arrow (4) is fixed at the position where the head of the billet is located in front of the heating furnace, the camera A (5) and the camera B (6) are respectively fixed at the positions where the head and the tail of the billet are located in front of the heating furnace, and the images of the two cameras are loaded on the computer (1); when the billet passes through the laser locator (2), the state of the limit switch changes, and after the roller stops, the billet reaches the designated position in front of the heating furnace door, the system captures the images of the cameras A (5) and B (6) at the current moment, intercepts the positions of the billet head and the billet tail in the images, calculates the length of the billet according to the program algorithm, and finally transmits the length calculation result to the PLC.

2. A method for measuring the image of the billet charging position of a steel rolling heating furnace, using the system for measuring the image of the billet charging position of a steel rolling heating furnace according to claim 1, characterized in that: When the billet passes through the laser locator (2), the operating signals of the on-site PLC laser locator (2) and the roller motor are collected, that is, the falling edge of the laser locator (2). After waiting for a period of time, the on-site roller motor stops, and the billet reaches the specified position in front of the heating furnace door. The images of the two cameras are intercepted and processed.

3. The method for measuring the image of the billet charging position of a steel rolling heating furnace according to claim 2, characterized in that: The image data captured by camera A and camera B are read, and the areas where the edges of the billet head and the billet tail are located are selected in the image; the boundary X-axis coordinate X_L_L on the left side of the heating furnace is determined according to the center point of the tail of the right-pointing arrow, and the boundary X-axis coordinate X_L_R on the right side of the heating furnace is determined according to the center point of the tail of the left-pointing arrow; in the selected image area, a brightness change threshold is set, and multiple horizontal line segments are determined according to the position of the center point of the tail of the arrow to obtain the brightness change on these line segments, find the X coordinate whose brightness change difference is greater than or equal to the set brightness change threshold, and record it in a list for statistics and analysis.

4. The method for measuring the image of the billet loading position of a steel rolling heating furnace according to claim 3, characterized in that: If the number of recorded X coordinates that meet the requirements is greater than or equal to 5, and the number of times the most common X coordinate appears is greater than or equal to 3 times, then this X coordinate is taken as the billet head position or billet tail position. If the number of recorded X coordinates that meet the requirements is less than 5, and the number of times the most common X coordinate appears is greater than or equal to 2 times, then this X coordinate is taken as the billet head position or billet tail position. The data recorded in the list are processed to obtain the billet head position X_G_R and the billet tail position X_G_L.

5. The method for measuring the image of the billet loading position of a steel rolling heating furnace according to claim 4, characterized in that: Subtract the estimated pixel to the heating furnace door position from the recorded X coordinate, and multiply by the distance X_D corresponding to one pixel point, then calculate the distance L_R between the head of the billet and the boundary of the heating furnace and the distance L_L between the tail of the billet and the boundary of the heating furnace. Use the distance L between the two edges of the heating furnace minus the distance between the head and the tail of the billet and the boundary of the heating furnace to obtain the billet length L_G; L_R= (X_G_R-X_L_R)*X_D L_L= (X_G_L-X_L_L)*X_D L_G = LL _R-L _L After the system calculates the length of the billet, it sends the billet length information to the PLC.

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