A method for centering steel coils on cold rolling uncoiler

Abstract

The present invention discloses a centering method for coiling of a cold rolling uncoiler, comprising the following steps: predetermining the vertical distance L between an ultrasonic sensor and the center line of the uncoiler mandrel; a steel coil transport vehicle transports the steel coil to a predetermined position for coiling; on-site verification of the radius R of the steel coil and determination of the center point of the steel coil; the ultrasonic sensor measures the distance s between the reflection point of the circular arc surface of the steel coil; calculating the difference h between the center height of the steel coil and the center height of the uncoiler mandrel; comparing the height difference h value with the allowable error δ value; adjusting the saddle that carries the steel coil up or down; and performing a coiling operation. The present invention adopts a convenient measurement and adjustment method to achieve the purpose of aligning the center height of the steel coil with the center height of the uncoiler mandrel, efficiently completing the "centering" operation, improving production efficiency, and ensuring safe production.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgy, and in particular relates to a centering method for coiling a steel coil of a cold rolling uncoiler. Background Art

[0002] In the production process of cold-rolled strips in the metallurgical industry, a steel coil transport trolley is generally used to transport the steel coil to the predetermined position at the end of the uncoiler mandrel. Before coiling, the diameter of the steel coil is measured first, and then the height of the steel coil transport trolley is calculated according to the height of the uncoiler mandrel to ensure that the center height of the steel coil is basically consistent with the center height of the uncoiler mandrel, which is what the industry calls "centering", and then the coiling is carried out. In this operation process, whether the height value that the steel coil transport trolley needs to be lifted is accurate has a decisive influence on the success or failure of the entire coiling operation. Once the height value that the steel coil transport trolley needs to be lifted has an error, it will cause the steel coil to pull out during the coiling process. In severe cases, the mandrel will flip the steel coil, damage the equipment, affect production, and cause economic losses. In order to avoid accidents in the coiling operation, the "centering" problem of the steel coil and the uncoiler mandrel must be effectively solved. In recent years, peers have conducted a lot of research in this regard.

[0003] The Chinese invention patent specification discloses "a method for centering steel coils (publication number CN111842492A)", and specifically discloses the following content: after the coil trolley lifts the steel coil from the saddle to the operating position height, it drags the steel coil to move in the direction of the unwinder mandrel through the grating, and calculates the deviation ε between the center line of the saddle and the center line of the steel coil when the steel coil is placed on the saddle according to the formula ε=L2-(S1+S2) / 2, S1 is the distance between the edge of the steel coil and the grating, L1 is the distance between the center of the saddle and the center of the unwinder mandrel, and S2 is the distance the trolley travels when the steel coil moves out of the grating. The distance that the steel coil and the rolling line need to move is S=L1-ε, that is, S=L1-L2+(S1+S2) / 2, and L2 is the distance between the center of the saddle and the grating. The invention can automatically calculate the horizontal movement distance of the coil trolley, thereby realizing centering in the horizontal direction. However, this centering can generally be solved by setting the limit of the steel coil transport vehicle. In actual production, the diameter of the steel coil is constantly changing, so what needs to be solved more is the centering in the vertical direction.

[0004] The Chinese invention patent specification also discloses "a steel coil height centering device and method thereof (Announcement No. N104475463B)", and specifically discloses the following contents: including a coil trolley, on which a saddle for placing the steel coil, a lifting device for adjusting the height of the steel coil, a lifting encoder for recording the lifting height of the steel coil by the lifting device, and a limiter for defining the mechanical zero point are arranged. A column is arranged on both sides of the moving track of the coil trolley, one of which is provided with a positioning light source for emitting a concentrated light beam, and the other is provided with a light receiving device for receiving the light emitted by the positioning light source. The positioning light source and the light receiving device are located at the same height and the connecting line thereof is perpendicular to the moving track. This method obtains the center of the steel coil by measuring the height difference between the upper edge of the inner diameter of the steel coil and the lower edge of the inner diameter. Therefore, the steel coil needs to be repeatedly lifted and lowered, and there are many devices used for measurement, and the operation is relatively cumbersome. Summary of the invention

[0005] 1. Technical issues to be solved

[0006] The present invention proposes a centering method for coiling a steel coil of a cold rolling uncoiler, the purpose of which is to adopt a convenient measurement and adjustment method to achieve consistency between the center height of the steel coil and the center height of the uncoiler mandrel, and to efficiently complete the "centering" operation.

[0007] 2. Technical Solution

[0008] By measuring the distance between the steel coil and the ultrasonic sensor, it is determined whether the center height of the steel coil is consistent with the center height of the uncoiler mandrel. The device used in the centering method includes an ultrasonic sensor and a steel coil transport vehicle. The ultrasonic sensor is installed at the terminal of the walking track of the steel coil transport vehicle through a column. The beam of the ultrasonic sensor intersects the center line of the uncoiler mandrel vertically and is parallel to the center line of the walking track and is located in the same vertical plane; the steel coil transport vehicle is provided with a saddle for carrying the steel coil, and the bottom of the saddle is connected to a lifter; specifically, the following steps are included:

[0009] 1) Determine in advance the vertical distance L between the ultrasonic sensor and the center line of the uncoiler mandrel;

[0010] 2) The steel coil transport vehicle transports the steel coil to the predetermined position for loading;

[0011] 3) Check the radius R of the steel coil on site and determine the center point of the steel coil;

[0012] 4) The ultrasonic sensor measures the distance s between it and the reflection point on the arc surface of the steel coil;

[0013] 5) Through the formula Calculate the difference h between the center height of the steel coil and the center height of the uncoiler mandrel, where: R is the radius of the steel coil, L is the vertical distance between the ultrasonic sensor and the center line of the uncoiler mandrel, and s is the distance between the ultrasonic sensor and the reflection point on the arc surface of the steel coil;

[0014] 6) Compare the difference h between the center height of the steel coil and the center height of the uncoiler mandrel with the allowable error δ;

[0015] 6.1) When h = 0, it indicates that the center height of the steel coil is consistent with the center height of the uncoiler mandrel, which meets the centering requirements, and proceed to step 7);

[0016] 6.2) When h≤allowable error δ, it indicates that the difference between the center height of the steel coil and the center height of the uncoiler mandrel basically meets the centering requirements, and proceed to step 7);

[0017] 6.3) When h> allowable error δ, it indicates that the difference between the center height of the steel coil and the center height of the uncoiler mandrel does not meet the centering requirements. At this time, an alarm signal is issued and the h value is displayed. At the same time, the saddle carrying the steel coil is adjusted up or down;

[0018] 6.4) If the h value increases during the upward adjustment, then change to downward adjustment until h approaches 0 and proceed to step 7); if the h value increases during the downward adjustment, then change to upward adjustment until h approaches 0 and proceed to the next step;

[0019] 7) Perform the roll-up operation.

[0020] The calculation of the difference h between the center height of the steel coil and the center height of the uncoiler mandrel described in step 5) is completed by a PLC programmable controller, which stores the pre-input R, L information and the actual measured distance s information from the ultrasonic sensor obtained through the encoder.

[0021] The step 6) of comparing the difference h between the center height of the steel coil and the center height of the uncoiler mandrel with the allowable error δ is completed by the PLC programmable controller.

[0022] The adjustment of the saddle carrying the steel coil to rise or fall in step 6.3) is that the driving module receives the driving signal sent by the PLC programmable controller through the wireless router through the wireless receiver, and drives the lifter connected to the bottom of the saddle.

[0023] The sending of the alarm signal and displaying the h value in step 6.3) is that the PLC programmable controller drives the alarm device to send the alarm signal through the application server and drives the display to display the h value.

[0024] The device used in the centering method also includes a positioner connected to the travel track. When the positioner contacts the front end of the steel coil transport vehicle, the center point of the steel coil and the center line of the uncoiler mandrel are located in the same vertical plane.

[0025] 3. Beneficial Effects

[0026] The present invention discloses a centering method for coiling a steel coil of a cold rolling uncoiler, which adopts a convenient measuring and adjusting method to achieve the purpose of making the center height of the steel coil and the center height of the uncoiler mandrel tend to be consistent, efficiently completes the "centering" operation, improves production efficiency, and ensures safe production. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a flow chart of the centering method of the present invention.

[0028] Figure 2 It is a structural diagram of the measurement and control unit of the present invention.

[0029] Figure 3 It is a structural diagram of the execution unit of the present invention.

[0030] Figure 4 It is a schematic diagram of the layout of the device used in the present invention.

[0031] Figure 5 yes Figure 4 Right view of .

[0032] Figure 6 It is a schematic diagram when the center height of the steel coil is consistent with the center height of the uncoiler mandrel.

[0033] Figure 7 It is a schematic diagram when the center height of the steel coil is higher than the center height of the uncoiler mandrel.

[0034] Figure 8 It is a schematic diagram when the center height of the steel coil is lower than the center height of the uncoiler mandrel. DETAILED DESCRIPTION

[0035] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings to facilitate a clearer understanding by those skilled in the art.

[0036] The centering method of the present invention utilizes the principle of the Pythagorean theorem and determines whether the center height of the steel coil is consistent with the center height of the uncoiler mandrel by measuring the distance between the steel coil and the ultrasonic sensor.

[0037] like Figure 2 , Figure 3 , Figure 4 , Figure 5As shown, the device used in the centering method includes: a measurement and control unit, an execution unit, the measurement and control unit includes an ultrasonic sensor 1, a PLC programmable controller, and an application server. The ultrasonic sensor is installed at the terminal of the walking track 4 of the steel coil transport vehicle through a column 3, and the beam 5 of the ultrasonic sensor intersects vertically with the center line 7 of the uncoiler core shaft 6, and is parallel to the center line 8 of the walking track and is located in the same vertical plane; the ultrasonic sensor is connected to the input of the PLC programmable controller through an encoder, the input of the application server is connected to the output of the PLC programmable controller, and the output of the application server is respectively connected to a wireless router, an alarm, and a display; the execution unit includes a steel coil transport vehicle 2, a drive module, and a wireless receiver. The steel coil transport vehicle is provided with a saddle 9 for carrying steel coils, and the bottom of the saddle is connected to a lifter 10; the input end of the drive module is connected to the wireless receiver, and its output end is connected to the lifter.

[0038] The device used in the centering method also includes a positioner 12 connected to the travel track 4, and the installation position of the positioner is set so that when the front end of the steel coil transport vehicle 2 contacts the positioner, the center point 13 of the steel coil and the center line 7 of the uncoiler mandrel 6 are located in the same vertical plane. Figure 6 It can be seen that this setting will not be affected by the change in the diameter of the steel coil. Therefore, the centering method of the present invention only needs to consider how to make the center height of the steel coil consistent with the center height of the uncoiler mandrel.

[0039] The following are the specific steps for alignment (combined with Figure 1 ):

[0040] Embodiment 1

[0041] 1) Determine in advance the vertical distance L between the ultrasonic sensor and the center line of the uncoiler mandrel = 3m (such as Figure 5 As shown), this distance is constant;

[0042] 2) The steel coil transport vehicle transports the steel coil 11 to the predetermined position of the upper coil, and makes the positioner 12 closely contact with the front end of the steel coil transport vehicle 2 (such as Figure 6 shown);

[0043] 3) Check the radius of the steel coil R=2m on site and determine the center point 13 of the steel coil;

[0044] 4) The ultrasonic sensor measures the distance s=1m between the ultrasonic sensor and the reflection point on the arc surface of the steel coil;

[0045] 5) Through the formula Calculate the difference between the center height of the steel coil and the center height of the uncoiler mandrel h=0, where: R is the radius of the steel coil, L is the vertical distance between the ultrasonic sensor and the center line of the uncoiler mandrel, and s is the distance between the ultrasonic sensor and the reflection point on the arc surface of the steel coil. This calculation is completed by the PLC programmable controller, which stores the pre-input R and L information and the actual distance s information obtained from the ultrasonic sensor through the encoder;

[0046] 6) The PLC programmable controller compares the difference h=0 between the center height of the steel coil and the center height of the uncoiler mandrel with the allowable error δ=1 cm;

[0047] h=0, that is: Ls=R (such as Figure 6 As shown), it indicates that the center height of the steel coil is consistent with the center height of the uncoiler mandrel, which meets the centering requirements, and proceed to step 7);

[0048] 7) Perform the roll-up operation.

[0049] Embodiment 2

[0050] 1) Determine in advance the vertical distance L between the ultrasonic sensor and the center line of the uncoiler mandrel = 3m (such as Figure 5 As shown), this distance is constant;

[0051] 2) The steel coil transport vehicle transports the steel coil 11 to the predetermined position of the upper coil, and makes the positioner 12 closely contact with the front end of the steel coil transport vehicle 2 (such as Figure 6 shown);

[0052] 3) Check the radius of the steel coil R=2m on site and determine the center point 13 of the steel coil;

[0053] 4) The ultrasonic sensor measures the distance between it and the reflection point on the arc surface of the steel coil s = 1.01m;

[0054] 5) Through the formula Calculate the difference between the center height of the steel coil and the center height of the uncoiler mandrel h = 20cm, where: R is the radius of the steel coil, L is the vertical distance between the ultrasonic sensor and the center line of the uncoiler mandrel, and s is the distance between the ultrasonic sensor and the reflection point on the arc surface of the steel coil. This calculation is completed by the PLC programmable controller, which stores the pre-input R and L information and the actual distance s information obtained from the ultrasonic sensor through the encoder;

[0055] 6) The PLC programmable controller compares the difference h = 20 cm between the center height of the steel coil and the center height of the uncoiler mandrel with the allowable error δ = 1 cm;

[0056] h> allowable error δ, (such as Figure 7As shown), it indicates that the difference between the center height of the steel coil and the center height of the uncoiler mandrel does not meet the centering requirement. At this time, the PLC programmable controller drives the alarm to send an alarm signal through the application server, and drives the display to display the h value; at the same time, the drive module receives the drive signal sent by the PLC programmable controller through the wireless router through the wireless receiver, and drives the lifter connected to the bottom of the saddle to adjust the saddle carrying the steel coil to rise or fall;

[0057] When h>allowable error δ, it is not known whether the center height of the steel coil is higher or lower than the center height of the uncoiler mandrel. The next step can make up for this defect.

[0058] If the h value increases during the upward adjustment, then the adjustment is changed to a downward adjustment until h approaches 0, and the process goes to step 7); if the h value increases during the downward adjustment, then the adjustment is changed to an upward adjustment until h approaches 0, and the process goes to step 7);

[0059] In this embodiment, when the downward adjustment is performed, the h value tends to 0, and then the process goes to step 7);

[0060] 7) Perform the roll-up operation.

[0061] Embodiment 3

[0062] 1) Determine in advance the vertical distance L between the ultrasonic sensor and the center line of the uncoiler mandrel = 3m (such as Figure 5 As shown), this distance is constant;

[0063] 2) The steel coil transport vehicle transports the steel coil 11 to the predetermined position of the upper coil, and makes the positioner 12 closely contact with the front end of the steel coil transport vehicle 2 (such as Figure 6 shown);

[0064] 3) Check the radius of the steel coil R=2m on site and determine the center point 13 of the steel coil;

[0065] 4) The ultrasonic sensor measures the distance between it and the reflection point on the arc surface of the steel coil s = 1.005m;

[0066] 5) Through the formula Calculate the difference between the center height of the steel coil and the center height of the uncoiler mandrel h = 14cm, where: R is the radius of the steel coil, L is the vertical distance between the ultrasonic sensor and the center line of the uncoiler mandrel, and s is the distance between the ultrasonic sensor and the reflection point on the arc surface of the steel coil. This calculation is completed by the PLC programmable controller, which stores the pre-input R and L information and the actual distance s information obtained from the ultrasonic sensor through the encoder;

[0067] 6) The PLC programmable controller compares the difference h = 14 cm between the center height of the steel coil and the center height of the uncoiler mandrel with the allowable error δ = 1 cm;

[0068] h> allowable error δ (such as Figure 8 As shown), it indicates that the difference between the center height of the steel coil and the center height of the uncoiler mandrel does not meet the centering requirement. At this time, the PLC programmable controller drives the alarm to send an alarm signal through the application server, and drives the display to display the h value; at the same time, the drive module receives the drive signal sent by the PLC programmable controller through the wireless router through the wireless receiver, and drives the lifter connected to the bottom of the saddle to adjust the saddle carrying the steel coil to rise or fall;

[0069] When h>allowable error δ, it is not known whether the center height of the steel coil is higher or lower than the center height of the uncoiler mandrel. The next step can make up for this defect.

[0070] If the h value increases during the upward adjustment, then the adjustment is changed to a downward adjustment until h approaches 0, and the process goes to step 7); if the h value increases during the downward adjustment, then the adjustment is changed to an upward adjustment until h approaches 0, and the process goes to step 7);

[0071] In this embodiment, when performing the upward adjustment, the h value tends to 0, and then proceeds to the next step;

[0072] 7) Perform the roll-up operation.

[0073] The present invention discloses a centering method for coiling a steel coil of a cold rolling uncoiler, which adopts a convenient measuring and adjusting method to achieve the purpose of making the center height of the steel coil and the center height of the uncoiler mandrel tend to be consistent, efficiently completes the "centering" operation, improves production efficiency, and ensures safe production.

[0074] The present invention is not limited to the above-mentioned specific implementation modes, and various improvements made by those skilled in the art to the technical solutions according to the concept of the present invention shall all fall within the scope of protection claimed by the present invention.

Claims

1. A method for centering a coil of a cold rolling uncoiler, characterized in that: By measuring the distance between the steel coil and the ultrasonic sensor, it is determined whether the center height of the steel coil is consistent with the center height of the uncoiler mandrel. The device used in the centering method includes an ultrasonic sensor (1) and a steel coil transport vehicle (2). The ultrasonic sensor is installed at the end of a walking track (4) of the steel coil transport vehicle through a column (3). The beam (5) of the ultrasonic sensor intersects vertically with the center line (7) of the uncoiler mandrel (6) and is parallel to the center line (8) of the walking track and is located in the same vertical plane. The steel coil transport vehicle is provided with a saddle (9) for carrying the steel coil, and the bottom of the saddle is connected to a lifter (10). Specifically, the following steps are included: 1) Determine in advance the vertical distance L between the ultrasonic sensor and the center line of the uncoiler mandrel; 2) The steel coil transport vehicle transports the steel coil (11) to a predetermined position for loading the coil; 3) Check the radius R of the steel coil on site and determine the center point of the steel coil (13); 4) The ultrasonic sensor measures the distance s between it and the reflection point on the arc surface of the steel coil; 5) Through the formula Calculate the difference h between the center height of the steel coil and the center height of the uncoiler mandrel, where: R is the radius of the steel coil, L is the vertical distance between the ultrasonic sensor and the center line of the uncoiler mandrel, and s is the distance between the ultrasonic sensor and the reflection point on the arc surface of the steel coil; 6) Compare the difference h between the center height of the steel coil and the center height of the uncoiler mandrel with the allowable error δ; 6.1) When h = 0, it indicates that the center height of the steel coil is consistent with the center height of the uncoiler mandrel, which meets the centering requirements, and proceed to step 7); 6.2) When h≤allowable error δ, it indicates that the difference between the center height of the steel coil and the center height of the uncoiler mandrel basically meets the centering requirements, and proceed to step 7); 6.3) When h> allowable error δ, it indicates that the difference between the center height of the steel coil and the center height of the uncoiler mandrel does not meet the centering requirements. At this time, an alarm signal is issued and the h value is displayed. At the same time, the saddle carrying the steel coil is adjusted up or down; 6.4) If the h value increases during the upward adjustment, then change to downward adjustment until h approaches 0 and proceed to step 7); if the h value increases during the downward adjustment, then change to upward adjustment until h approaches 0 and proceed to the next step; 7) Perform the roll-up operation.

2. The centering method according to claim 1, characterized in that: The calculation of the difference h between the center height of the steel coil and the center height of the uncoiler mandrel described in step 5) is completed by a PLC programmable controller, which stores the pre-input R, L information and the actual measured distance s information from the ultrasonic sensor obtained through the encoder.

3. The centering method according to claim 2, characterized in that: The step 6) of comparing the difference h between the center height of the steel coil and the center height of the uncoiler mandrel with the allowable error δ is completed by the PLC programmable controller.

4. The centering method according to claim 3, characterized in that: The adjustment of the saddle carrying the steel coil to rise or fall in step 6.3) is that the driving module receives the driving signal sent by the PLC programmable controller through the wireless router through the wireless receiver, and drives the lifter connected to the bottom of the saddle.

5. The centering method according to claim 4, characterized in that: The sending of the alarm signal and displaying the h value in step 6.3) is that the PLC programmable controller drives the alarm device to send the alarm signal through the application server and drives the display to display the h value.

6. The centering method according to any one of claims 1 to 5, characterized in that: The device used in the centering method also includes a positioner (12) connected to the travel track (4), and when the positioner contacts the front end of the steel coil transport vehicle (2), the center point (13) of the steel coil and the center line (7) of the uncoiler mandrel (6) can be located in the same vertical plane.

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