A control method and system for positioning the tail end of a strip

Abstract

The application provides a control method and system for positioning the tail position of a strip steel, which adopts variable-angle control of the stopping position of the strip tail by fitting data in multiple groups and dynamically calculating the required stopping angle according to the actual winding diameter, so as to obtain an accurate positioning distance and realize the function of making the strip tail fall on an arbitrary point on the circumference of the strip coil according to the requirement. The application makes the baling and tightening, and improves the baling quality. The application avoids accidents in the baling process, and improves the production efficiency and safety.

Description

Technical Field

[0001] This invention belongs to the field of metallurgical strip steel control technology, specifically relating to a control method and system for positioning the tail of a strip steel. Background Technology

[0002] In strip steel processing units, coiling strip steel via a coiler is a common process. In traditional production processes, after the strip steel is fully wound onto the coiler drum, the tail of the strip falls to a fixed position on the circumference of the coil before uncoiling. After uncoiling, the strip is either not bundled at a fixed saddle or bundled using a bundling machine. In actual production, when a bundling machine is available, if the tail of the strip is left too long and the strip steel is high-strength steel, this positioning method is not conducive to subsequent bundling operations. It often results in the strip not being able to be bundled taut and is prone to accidents, thus affecting bundling quality and safety. Usually, a ground roller is added to improve bundling quality, but this method increases the unit's operating time and reduces its production efficiency. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a control method and system for positioning the tail of a strip steel, so that the tail of the strip falls on any point on the circumference of the strip coil as required.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a method for controlling the position of the tail of a steel strip, comprising the following steps:

[0005] S1: Shearing strip steel;

[0006] S2: Let the angle by which the desired strip positioning point deviates from the vertical centerline be the stopping angle; fit the coil diameter-stop angle relationship curve of the coiler based on multiple sets of historical data on the coil diameter and the stopping angle.

[0007] S3: Start the coiler to coil the strip steel, and obtain the required stop angle according to the coil diameter and the coil diameter-stop angle relationship curve;

[0008] S4: Calculate the positioning length of the strip tail; the specific steps are as follows:

[0009] S41: The winding machine decelerates and stops, and the deceleration distance from the speed at positioning to the stop is recorded;

[0010] S42: Calculate the positioning length of the strip tail based on the horizontal distance between the end point of the strip tail and the lower roller point of the guide roller, the arc length of the guide roller after strip bonding and shearing, the length of the common tangent segment between the guide roller after shearing and the coiler coil, the arc length of the strip bonding and coiler coil, and the deceleration distance of the coiler from the speed at positioning to the stop.

[0011] According to the above scheme, the specific steps in step S42 are as follows: the process of calculating the positioning length starts after the system sends the signal that the cutting is completed and ends when the positioning with the tail is completed.

[0012] According to the above scheme, in step S42, the arc length of the strip steel adhering to the shearing guide roller is calculated based on the radius of the shearing guide roller, the radius perpendicular to the common tangent line between the shearing guide roller and the coiler steel coil, and the radius perpendicular to the tangent line between the end point of the strip and the guide roller.

[0013] Furthermore, in step S42, the angle between the radius perpendicular to the common tangent of the shearing guide roller and the horizontal line and the radius perpendicular to the tangent of the belt tail end point and the guide roller is calculated based on the angle between the line connecting the center of the coiler steel coil and the center of the shearing guide roller and the horizontal line, the distance between the center of the coiler steel coil and the center of the shearing guide roller, the radius of the coiler steel coil and the radius of the shearing guide roller.

[0014] According to the above scheme, in step S42, the length of the common tangent segment between the shearing guide roller and the coiler steel coil is calculated based on the distance between the center of the coiler steel coil and the center of the shearing guide roller, the radius of the coiler steel coil, and the radius of the shearing guide roller.

[0015] Furthermore, in step S42, the distance between the center of the coil and the center of the shearing guide roller is calculated based on the horizontal and vertical distances between the center of the coil and the center of the shearing guide roller.

[0016] According to the above scheme, in step S42, the arc length of the strip steel adhering to the coiler steel coil is calculated based on the center of the coiler steel coil, the stopping angle, the angle between the line connecting the center of the coiler steel coil and the center of the shearing guide roller and the horizontal line, and the angle between the line connecting the center of the coiler steel coil and the center of the shearing guide roller and the radius passing through the tangent point of the coiler steel coil.

[0017] A control system for positioning the tail of a strip includes a processor and a memory. The memory stores computer instructions, and the processor executes the computer instructions stored in the memory. When the computer instructions are executed by the processor, the system implements the steps of a control method for positioning the tail of a strip.

[0018] Furthermore, it also includes a fitting module for fitting the coil diameter-stop angle curve of the coiler.

[0019] A computer memory storing a computer program executable by a computer processor, the computer program performing a control method for positioning the tail of a strip steel.

[0020] The beneficial effects of this invention are as follows:

[0021] 1. The present invention provides a control method and system for positioning the tail of a strip steel. Based on the equipment conditions, multiple sets of fitting data are used, and the required stopping angle is dynamically calculated according to the actual coil diameter. The stopping position of the strip tail is controlled by variable angle control to obtain a precise positioning distance. This achieves the function of making the strip tail fall on any point on the circumference of the coil as required.

[0022] 2. This invention tightens the bundling, thus improving the bundling quality.

[0023] 3. This invention avoids accidents during the bundling process and improves production efficiency and safety. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the control system for positioning with tail angle according to an embodiment of the present invention.

[0025] Figure 2 This is a data correspondence diagram of the positioning angles in an embodiment of the present invention.

[0026] Figure 3 This is a fitted curve of the coil diameter and the stop angle β of the coiler in an embodiment of the present invention.

[0027] Figure 4 This is a schematic diagram illustrating the calculation of the tail positioning length according to an embodiment of the present invention.

[0028] Figure 5 This is a flowchart of an embodiment of the present invention. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0030] Example 1

[0031] See Figure 5 The embodiments of the present invention include the following steps:

[0032] See Figure 2 Based on at least 20 sets of data on the coil diameter (i.e., coil diameter) and the stopping angle β (i.e., the angle of the positioning point deviating from the vertical centerline) of the coiler during actual production, as shown in the table below, the relationship curve between the two is fitted as follows: Figure 3 As shown;

[0033] Table 1

[0034] Winding machine diameter offset angle 1000 48.568 1050 47.955 1100 47.388 1150 46.864 1200 46.377 1250 45.923 1300 45.5 1350 45.103 1400 44.731 1450 44.381 1500 44.052 1550 43.741 1600 43.447 1650 43.17 1700 42.906 1750 42.656 1800 42.418 1850 42.192 1900 41.977 1950 41.771 2000 41.575

[0035] After the strip is completely wound onto the drum, the required stopping angle is obtained based on the dynamic and fitting curves of the equipment, so that the tail of the strip stops at different positions.

[0036] Calculate the positioning length of the strip tail, including the horizontal distance between the end point of the strip tail and the lower roller point of the guide roller, the arc length of the guide roller after strip bonding and shearing, the sum of the length of the common tangent segment of the guide roller after shearing and the coiler coil and the arc length of the strip bonding coiler coil, and subtract the deceleration distance of the coiler from the initial positioning speed to the stop.

[0037] The most crucial aspect of tail-based positioning is the calculation of the positioning length. This calculation begins after the system issues the "cutting complete" signal and ends upon positioning completion. A calculation diagram is shown below. Figure 4 .

[0038] Let D be the diameter of the coil in the coiler, RA be the radius of the coil in the coiler, d be the diameter of the post-shear guide roller (post-shear pinch roller), rb be the radius of the post-shear guide roller, X be the horizontal distance between the centers of the two circles, Y be the vertical distance between the centers of the two circles, A be the angle between the line connecting the centers of the two circles and the horizontal line, B be the angle between the line connecting the tangent points of the larger circle and the line connecting the centers of the circles, offset be the angle by which the desired positioning point deviates from the vertical center line, BRAKE be the deceleration distance of the coiler from the positioning speed to the stop, and L0 be the horizontal distance between the starting point of the belt tail and the lower roller of the guide roller. Since the coil diameter D is much larger than the diameter d of the post-shear guide roller, the positioning length depends on the coil diameter D. Therefore, the algorithm for the positioning length #s is as follows:

[0039] #X:=1945.0;

[0040] #Y: = 1380.0;

[0041] #RA: =D / 2.0;

[0042] #rb:=d / 2.0;

[0043] #A: = ATAN(#Y / #X);

[0044] #M:=SQRT(#X*#X+#Y*#Y);

[0045] #L2:=SQRT(#M*#M-(#RA-#rb)*(#RA-#rb));

[0046] #L1:=#rb*(#A-ASIN((#RA-#rb) / #M));

[0047] #B:=ACOS((#RA-#rb) / #M);

[0048] #L3:=#RA*(1.5*3.1415923-#A-#B-#offset / 360.0*2*3.1415923);

[0049] #s:=#L0+#L1+#L2+#L3-BRAKE;

[0050] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0051] Example 2

[0052] See Figure 1 This embodiment provides a system for a control method for positioning the tail position of a strip steel, including a processor and a memory. The memory stores computer instructions, and the processor executes the computer instructions stored in the memory. When the computer instructions are executed by the processor, the system implements the steps of a control method for positioning the tail position of a strip steel. It also includes a fitting module for fitting a roll diameter-stop angle curve.

[0053] The above embodiments are only used to illustrate the design concept and features of the present invention, and their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. The protection scope of the present invention is not limited to the above embodiments. Therefore, all equivalent changes or modifications made based on the principles and design ideas disclosed in the present invention are within the protection scope of the present invention.

Claims

1. A method for controlling the position of the tail end of a steel strip, characterized in that: Includes the following steps: S1: Shearing strip steel; S2: Let the angle by which the desired strip positioning point deviates from the vertical centerline be the stopping angle; fit the coil diameter-stop angle relationship curve of the coiler based on multiple sets of historical data on the coil diameter and the stopping angle. S3: Start the coiler to coil the strip steel, and obtain the required stop angle according to the coil diameter and the coil diameter-stop angle relationship curve; S4: Calculate the positioning length of the strip tail; the specific steps are as follows: S41: The winding machine decelerates and stops, and the deceleration distance from the speed at positioning to the stop is recorded; S42: Calculate the positioning length of the strip tail based on the horizontal distance between the end point of the strip tail and the lower roller point of the guide roller, the arc length of the guide roller after strip bonding and shearing, the length of the common tangent segment between the guide roller after shearing and the coiler coil, the arc length of the strip bonding and coiler coil, and the deceleration distance of the coiler from the speed at positioning to the stop. The arc length of the strip-fitting shearing guide roller is calculated based on the radius of the shearing guide roller, the radius perpendicular to the common tangent of the shearing guide roller and the coiler coil, and the radius perpendicular to the tangent of the strip tail end point and the guide roller. Calculate the length of the common tangent segment between the shearing guide roller and the coiling machine steel coil based on the distance between the center of the coiling machine steel coil and the center of the shearing guide roller, the radius of the coiling machine steel coil, and the radius of the shearing guide roller. The arc length of the strip steel bonded to the coil is calculated based on the center of the coil, the stopping angle, the angle between the line connecting the center of the coil and the center of the shearing guide roller and the horizontal line, and the angle between the line connecting the center of the coil and the center of the shearing guide roller and the radius passing through the tangent point of the coil.

2. The method for controlling the position of the tail of a positioning strip according to claim 1, characterized in that: In step S42, the specific steps are as follows: the process of calculating the positioning length starts after the system sends the signal that the cutting is complete and ends when the positioning with the tail is completed.

3. The method for controlling the position of the tail of a positioning strip according to claim 1, characterized in that: In step S42, the angle between the radius perpendicular to the common tangent of the coil and the shearing guide roller and the horizontal line is calculated based on the angle between the line connecting the center of the coil and the center of the shearing guide roller and the horizontal line, the distance between the center of the coil and the center of the shearing guide roller, the radius of the coil and the radius of the shearing guide roller.

4. The method for controlling the position of the tail of a positioning strip according to claim 1, characterized in that: In step S42, the distance between the center of the coil and the center of the shearing guide roller is calculated based on the horizontal and vertical distances between the center of the coil and the center of the shearing guide roller.

5. A system for a control method for positioning the tail end of a strip as described in any one of claims 1 to 4, characterized in that: The system includes a processor and a memory. The memory stores computer instructions, and the processor executes the computer instructions stored in the memory. When the computer instructions are executed by the processor, the system implements the steps of a control method for positioning the tail of a strip steel.

6. The system for controlling the position of the tail of a steel strip according to claim 5, characterized in that: It also includes a fitting module for fitting the diameter-stop angle curve of the coiler.

7. A computer memory, characterized in that: It contains a computer program that can be executed by a computer processor, which performs a control method for positioning the tail of a strip as described in any one of claims 1 to 4.

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