Method for detecting the center line of a steel coil at the entry and exit of a 20-roller rolling mill

Abstract

The present application belongs to the technical field of twenty roller mill equipment, and particularly relates to a twenty roller mill inlet and outlet steel coil center line detection method. The specific steps are as follows: step one: design manual coil loading and automatic coil loading functions, install a laser range finder behind an inlet and outlet coil drum push plate, the laser emitted by the range finder is irradiated to the steel coil side surface through the hole of the push plate, and the measurement result is transmitted back to a PLC for calculation; step two: calculation formula: steel coil center and coil drum center position deviation; step three: according to the y value calculated by the range finder measurement, it is determined whether the steel coil position is correct, the laser range finder detects that the steel coil width center and the coil drum center distance meet the process requirements, which indicates that the coil loading position is correct, if not, the system gives an alarm prompt, the steel coil is not loaded correctly, and the button is pressed to drive the steel coil trolley to move the steel coil outward or inward until the requirements are met. The method avoids the disorder of the original coil loading function, does not need manual measurement of the steel coil position, realizes real-time monitoring, and improves the operation efficiency.

Description

Technical Field

[0001] This invention belongs to the technical field of 20-roll rolling mill equipment, and particularly relates to a method for detecting the center line of steel coils at the inlet and outlet of a 20-roll rolling mill. Background Technology

[0002] In the process of controlling the shape of silicon steel, whether the steel coil is centered on the drum is a key point. The original automatic coil feeding system at the mill's inlet and outlet cannot always ensure that the steel coil is automatically fed to the center of the drum. The main reasons are:

[0003] The original design had a flaw: the conditions were not met. The original design used an automatic width measuring device to measure the width of the steel coil to achieve automatic winding. It required that the inner and outer rings of the steel coil be neat and without misalignment. However, the actual steel coils on site had inconsistent widths due to the welding of the guide strips at the beginning and end of the previous process with the raw material coil. This caused misalignment of the inner or outer rings of the raw material coil, resulting in incorrect measurement of the raw material coil width information by the automatic measurement device. Consequently, the automatic winding function malfunctioned and could not be able to wind the steel coil to the center position of the drum.

[0004] Low work efficiency and safety hazards: After the steel coil was loaded, it was necessary to manually measure its position with a tape measure, which not only increased the workload but also increased the frequency of workers entering the dangerous area of ​​the coil, posing a safety hazard.

[0005] Unable to monitor online in real time: During the production process, the specific position of the steel coil cannot be monitored in real time after it deviates from its designated position, which is not conducive to the control of the plate shape process. Summary of the Invention

[0006] The purpose of this invention is to provide a method for detecting the center line of steel coils at the inlet and outlet of a 20-roll mill, which solves the problems of automatic coiling function disorder caused by misalignment of the inner and outer coils, the need for manual measurement of the coil position which poses safety hazards, and the inability to monitor in real time.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A method for detecting the centerline of steel coils at the inlet and outlet of a 20-roll rolling mill, the specific steps of which are as follows:

[0009] Step 1: The upper winding design includes manual and automatic winding functions. The laser rangefinder is installed behind the push plate of the inlet and outlet drum. The laser emitted by the rangefinder shines on the side surface of the steel coil through the holes of the push plate and transmits the measurement results back to the PLC for calculation. The PLC is connected to a computer monitor.

[0010] Step Two: Calculation Formula: The deviation between the center of the steel coil and the center of the drum is y. ,

[0011] D 测量 : Indicates the actual value measured by the rangefinder;

[0012] d: The distance between the rangefinder and the front end of the pusher plate (fixed value);

[0013] L: The length of the reel (fixed value);

[0014] W: The actual width of the target steel coil, which is automatically sent to the unit PLC at the third level;

[0015] Calculation result:

[0016] When y = 0, it means the target steel coil is correctly placed, and the steel coil is located at the center position of the reel;

[0017] When y > 0, it means the target steel coil is not correctly placed, and the steel coil deviates outward by y mm;

[0018] When y < 0, it means the target steel coil is not correctly placed, and the steel coil deviates inward by y mm;

[0019] Step 3: When manually loading the coil, only manually operate the coil car to move, and observe the deviation value y on the HMI screen in real time to ensure the correct loading position; when automatically loading the coil, execute the original system's automatic coil loading program. After the coil loading is completed, according to the y value measured and calculated by the rangefinder, automatically determine whether the position of the steel coil is correct. If the distance between the center of the steel coil width detected by the laser rangefinder and the center of the reel satisfies -3 mm < y < +3 mm, it meets the process requirements, indicating that the loading position is correct.

[0020] If y < -3 mm or y > 3 mm, the system gives an alarm prompt, indicating that the steel coil is not correctly placed. The operator presses the steel coil position adjustment button to drive the coil car to move the steel coil outward or inward. The laser rangefinder continuously measures until the requirements are met and the alarm prompt is解除.

[0021] Compared with the existing technology, the beneficial effects achieved by the present invention are:

[0022] Adopting two methods of manual coil loading and automatic coil loading, and for manual coil loading, only manually operate the coil car, without potential safety hazards. Using multiple methods simultaneously improves the applicability of the device;

[0023] The laser rangefinder is installed behind the pusher plate at the inlet and outlet reels. The pusher plate can also be used to protect the rangefinder from damage caused by flying steel fragments after the steel strip breaks. The laser emitted by the rangefinder accurately identifies the relative position between the steel coil and the reel, and then combines with the calculation formula to reduce measurement errors, avoid inaccurate positions of the steel coil after loading, and achieve loading the steel coil to the center position of the reel;

[0024] When loading the steel coil to the center position of the reel, there is no need for staff to manually measure the position of the steel coil, reducing potential safety hazards;

[0025] Connecting the PLC to the computer monitor for real-time monitoring. If there are any problems, they can be discovered in time, improving the operation efficiency. Description of the Drawings

[0026] Figure 1 This is a process flow diagram of the method of the present invention; Implementation

[0027] The present invention will be further described below with reference to specific embodiments.

[0028] A method for detecting the centerline of steel coils at the inlet and outlet of a 20-roll rolling mill, the specific steps of which are as follows:

[0029] Step 1: The upper winding design has two functions: manual winding and automatic winding. The laser rangefinder is installed behind the push plate of the inlet and outlet drum. The laser emitted by the rangefinder shines on the side surface of the steel coil through the hole of the push plate and transmits the measurement result back to the PLC for calculation. The PLC is connected to the computer monitor.

[0030] Step Two: Calculation Formula: Let y be the deviation between the center of the steel coil and the center of the drum. ,

[0031] D 测量 : Indicates the actual value measured by the rangefinder;

[0032] d: Distance between the rangefinder and the front end of the push plate (fixed value);

[0033] L: Length of the roll (fixed value);

[0034] W: The actual width of the target steel coil is automatically sent to the unit PLC at level three.

[0035] Calculation results:

[0036] When y=0, it indicates that the target steel coil is in the correct position and is located at the center of the drum;

[0037] When y > 0, it indicates that the target steel coil is not aligned correctly and is biased outward by y mm.

[0038] When y < 0, it indicates that the target steel coil is not aligned correctly and is biased inward by y mm.

[0039] Step 3: When manually winding, simply move the steel coil trolley manually and observe the deviation value y on the HMI screen in real time to ensure the winding position is correct; when automatically winding, execute the original system's automatic winding program. After winding is completed, the system automatically determines whether the steel coil position is correct based on the y value measured and calculated by the rangefinder. If the distance y between the center of the steel coil width and the center of the drum is +2mm, the process requirements are met, indicating that the winding position is correct.

[0040] If y is -6mm, the system will issue an alarm indicating that the steel coil is not aligned correctly. The operator should press the steel coil position adjustment button to move the steel coil trolley outwards, while the laser rangefinder continuously measures y until it meets the requirements, at which point the alarm will be deactivated. If y is 5mm, the system will issue an alarm indicating that the steel coil is not aligned correctly. The operator should press the steel coil position adjustment button to move the steel coil trolley inwards, while the laser rangefinder continuously measures y until it meets the requirements, at which point the alarm will be deactivated.

Claims

1. A method for detecting the centerline of steel coils at the inlet and outlet of a 20-roll rolling mill, characterized in that, The specific steps are as follows: Step 1: Design the manual and automatic rewinding functions. Install the laser rangefinder behind the push plate of the inlet and outlet reels. The laser emitted by the rangefinder passes through the holes in the push plate and irradiates the side surface of the steel coil. The measurement results are transmitted back to the PLC for calculation, and the PLC is connected to the computer monitor. Step Two: Calculation Formula: Let y be the deviation between the center of the steel coil and the center of the drum. , D 测量 : Indicates the actual value measured by the rangefinder; d: The distance between the rangefinder and the front end of the push plate; L: The length of the reel; W: The actual width of the target steel coil, which is automatically sent to the unit PLC at three levels; Calculation results: When y = 0, it means that the target steel coil is correctly loaded and the steel coil is located at the center position of the reel; When y > 0, it means that the target steel coil is not correctly loaded and the steel coil is deviated outward by y mm; When y < 0, it means that the target steel coil is not correctly loaded and the steel coil is deviated inward by y mm; Step 3: When manually rewinding, only manually operate the steel coil trolley to move, and observe the deviation value y on the HMI screen in real time to ensure the correct rewinding position. When automatically rewinding, execute the original system's automatic rewinding program. After rewinding is completed, according to the y value measured and calculated by the rangefinder, automatically determine whether the position of the steel coil is correct. If the distance between the center of the steel coil width detected by the laser rangefinder and the center of the reel satisfies -3mm < y < +3mm, it meets the process requirements, indicating that the rewinding position is correct. If y < -3mm or y > 3mm, the system gives an alarm prompt, indicating that the steel coil is not correctly loaded.

2. The method for detecting the centerline of steel coils at the inlet and outlet of a 20-roll mill according to claim 1, characterized in that, When the steel coil is not correctly loaded in Step 3, the operator presses the steel coil position adjustment button to drive the steel coil trolley to move the steel coil outward or inward. The laser rangefinder continuously measures until the requirements are met and the alarm prompt is解除.

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