Method for protecting the surface quality of a wringing roller in a cleaning section of a continuous production line

Abstract

The application provides a method for protecting the surface quality of squeeze rollers in a cleaning section of a continuous production line, and the method comprises the following steps: step S1, detecting whether a strip seam passes through and the length of the strip seam by using a strip seam detection device, and collecting the diameter of the squeeze rollers by using an encoder; step S2, when the strip seam is detected to pass through, calculating the time when the strip seam reaches each group of squeeze rollers according to the distance from the different positions of the squeeze rollers to the strip seam and the conveying speed of the strip in the production line; step S3, automatically lifting the squeeze rollers when the strip seam reaches the front of the squeeze rollers to avoid the strip seam; preventing the squeeze rollers from being scratched due to the passing of the strip seam; and step S4, calculating the time required for the strip seam to pass through the area below the squeeze rollers according to the length of the strip seam and the diameter of the squeeze rollers, and automatically lowering the squeeze rollers after the strip seam passes through. The application can automatically lift and lower the squeeze rollers to avoid the strip seam, and avoid the possible scratches when the squeeze rollers contact the strip seam.

Description

Technical Field

[0001] This invention relates to the field of automatic machinery technology, and in particular to a method for protecting the surface quality of squeeze rollers in the cleaning section of a continuous production line. Background Technology

[0002] In continuous aluminum processing production lines, the squeezing roller assembly in the cleaning section is designed with one roller at the top and one at the bottom, made of soft rubber, primarily used to remove moisture and residue from the strip surface. Normal cleaning processes require pretreatment (such as acid or alkaline washing) followed by a rinsing section (water washing). During normal operation, to ensure continuous production, a sewing machine is used to sew the front roll tail and the rear roll head together. These seams, passing over the squeezing rollers in the cleaning section, easily scratch the surface of the rollers, causing damage and affecting product quality. The strip surface is also prone to scratches due to these roller surface issues.

[0003] The original solution to this problem was to manually lift the upper roller of the squeeze roller when the suture site passed the inlet of the cleaning section, and then press the upper roller down again after the suture site exited the cleaning section. This method has many drawbacks: first, it is easy for the operator to forget to operate manually and the position is difficult to control precisely, which can easily lead to misoperation or omission; second, the process tank in the rear tank is very easy to be contaminated, resulting in mixed liquids and wasted chemicals.

[0004] This method is not only inefficient but also prone to misoperation. To solve the above problems, a method for protecting the surface quality of the squeeze rollers in the cleaning section of a continuous production line is proposed. Summary of the Invention

[0005] This invention proposes a method for protecting the surface quality of the squeeze rollers in the cleaning section of a continuous production line. It enables the automatic lifting and lowering of the squeeze rollers to avoid the seam opening and prevents possible abrasions when the rubber roller comes into contact with the seam opening.

[0006] The present invention adopts the following technical solution.

[0007] A method for protecting the surface quality of squeeze rollers in the cleaning section of a continuous production line, the protection method comprising the following steps;

[0008] Step S1: Use the strip seam detection device at the deflector roller of the cleaning section to detect whether the strip seam is passing and the length of the seam, and use the encoder to collect the diameter of the squeeze roller;

[0009] Step S2: When the strip seam is detected to pass through, calculate the time it takes for the strip seam to reach each set of squeeze rollers based on the distance from the squeeze rollers at different positions to the strip seam and the strip conveying speed of the production line.

[0010] Step S3: Based on the time calculation result of step S1, the squeeze roller automatically lifts up when the seam opening reaches the front of the squeeze roller to avoid the seam opening; to prevent the squeeze roller rubber roller from being scratched by the seam opening of the strip passing through.

[0011] Step S4: Calculate the time required for the seam to pass through the area below the squeeze roller based on the seam length and the squeeze roller diameter, so that the squeeze roller automatically descends after passing through the seam.

[0012] The squeeze rollers are grouped in the cleaning section of the continuous production line, with one squeeze roller at the top and one at the bottom forming a squeeze roller group.

[0013] The equipment used in the protection method includes a front turning roller of the cleaning section, a seam detection device, a squeezing roller group, a PLC control device, and a transmission device.

[0014] The front turning roller of the cleaning section is used to turn the strip. The front turning roller of the cleaning section is equipped with a detection point for the seam detection device and an encoder for calculating the travel length of the strip.

[0015] The seam detection device is used to detect whether there is a seam at the strip and to calculate the length of the seam passing through the seam detection device. The detection information and calculation results of the seam detection device are transmitted to the PLC control equipment.

[0016] The squeezing roller assembly in the cleaning section is used to remove impurities and liquids from the surface of the strip. The upper roller of the squeezing roller assembly is driven by a cylinder to lift and lower, while the lower roller is a fixed roller. The rotation of the squeezing rollers is driven by an external power source.

[0017] The thickness of the strip seam is greater than that of other parts of the strip; the seam detection device uses its laser rangefinder to measure the distance between the instrument and the strip surface to determine whether there is a strip seam at the point where the seam detection device passes;

[0018] When the front end of the strip seam enters the detection area of ​​the seam detection device, the distance measured by the laser rangefinder will change abruptly. When the rear end of the strip seam passes through the detection area of ​​the seam detection device, the distance measured by the laser rangefinder will also change abruptly. The time between the two abrupt changes is the time it takes for the strip seam to pass through the seam detection device.

[0019] The protection method includes the following calculation and derivation process;

[0020] Step 1: ① When the strip seam (front end) runs to the 3 o'clock position of the turning roller in the cleaning section, the seam detection device detects the strip seam and sends a rising edge signal to the PLC control device, and records the current time point T1.

[0021] ② When the suture opening (rear end) leaves the detection position of the suture opening detection device, a falling edge signal is sent to the PLC, and the current time point T2 is recorded;

[0022] ③ The length of the seam (X0) of the strip is calculated by the product of the time difference (T2-T1) between the two signals and the strip speed (v0), and the formula is X0 = (T2-T1)*v0;

[0023] The meanings of the relevant parameters in the above formula are as follows:

[0024] X0: The length of the strip seam calculated by the seam detection device, in meters;

[0025] T2: The time when the rear end of the suture leaves the detection position of the suture detection device, in seconds;

[0026] T1: The moment when the suture detection device detects the front end of the suture in the strip, in seconds;

[0027] v0: The running speed of the strip in the cleaning section, m / s;

[0028] ④ Record the moment when the suture (rear end) leaves the suture detection device as time t0.

[0029] Step 2: ① A seam detection device is installed at the 3 o'clock position of the front guide roller of the cleaning section with radius R. Use the following formula to calculate the distance l from the 12 o'clock position of the front guide roller of the cleaning section to the midpoint of the Nth squeeze roller of the cleaning section. N (N = 1, 2, 3...), then calculate the total length L from the seam detection device to the midpoint of the Nth squeezing roller in the cleaning section. N (N = 1, 2, 3...);

[0030] ② Let t be the time it takes for the Nth squeezing roller group to continuously complete the lifting and lowering action. NRD ; Calculate the distance x from the front end of the seam to the front of the Nth squeeze roller based on the strip speed v0. N The automatic lifting and lowering motion begins; the moment t at which the tip of the suture reaches this point... NA The result is calculated based on the detection location and time point T2 of the suture detection device and the strip speed v0.

[0031] Formula 1;

[0032] Formula 2;

[0033] Formula 3;

[0034] Note: N represents the number of squeezing rollers in the washing section;

[0035] The meanings of the relevant parameters in Formula 1, Formula 2, and Formula 3 are as follows:

[0036] L N : The total length from the seam detection device installed at the 3 o'clock position of the front guide roller of the cleaning section to the midpoint of the N squeeze roller of the cleaning section (N=1,2,3...), in meters;

[0037] R: The radius of the guide roller before the cleaning section, in meters;

[0038] l N : This is the distance from the 12 o'clock position of the front guide roller of the cleaning section to the midpoint of the Nth squeezing roller of the cleaning section, where N = 1, 2, 3..., and the unit is m;

[0039] X N : This is the distance from the front end of the seam to the front of the Nth squeeze roller, in meters;

[0040] t NRD : The time it takes for the Nth squeezing roller group to continuously complete the lifting and lowering action, in seconds;

[0041] t NA : The moment when the front end of the seam reaches the point where the N-number squeezing roller begins to lift, in seconds.

[0042] In step S4, the squeeze roller automatically descends after passing through the seam opening to squeeze out the liquid on the surface of the strip to prevent cross-contamination of the cleaning solution at different locations in the cleaning section.

[0043] The squeeze roller is a soft rubber roller.

[0044] This invention can be used to control the movement of the squeezing roller assembly in the cleaning section. It can automatically control the lifting and lowering of the squeezing rollers and make intelligent adjustments according to the changes in the position of the seam on the strip. Through the implementation of timing control, it can effectively protect the squeezing roller rubber roller from being scratched. Attached Figure Description

[0045] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0046] Appendix Figure 1 This is a schematic diagram of step one of the calculation and derivation process of the protection method (with the center point of the right roller as point O, and the coordinate axis set).

[0047] Appendix Figure 2 This is a schematic diagram of step two in the calculation and derivation process of the protection method (with the center point of the right roller as point O, and the coordinate axis set).

[0048] Appendix Figure 3 This is a schematic diagram of the equipment setup in the cleaning section of the production line according to the present invention. Detailed Implementation

[0049] As shown in the figure, a method for protecting the surface quality of squeeze rollers in the cleaning section of a continuous production line includes the following steps;

[0050] Step S1: Use the strip seam detection device at the deflector roller of the cleaning section to detect whether the strip seam is passing and the length of the seam, and use the encoder to collect the diameter of the squeeze roller;

[0051] Step S2: When the strip seam is detected to pass through, calculate the time it takes for the strip seam to reach each set of squeeze rollers based on the distance from the squeeze rollers at different positions to the strip seam and the strip conveying speed of the production line.

[0052] Step S3: Based on the time calculation result of step S1, the squeeze roller automatically lifts up when the seam opening reaches the front of the squeeze roller to avoid the seam opening; to prevent the squeeze roller rubber roller from being scratched by the seam opening of the strip passing through.

[0053] Step S4: Calculate the time required for the seam to pass through the area below the squeeze roller based on the seam length and the squeeze roller diameter, so that the squeeze roller automatically descends after passing through the seam.

[0054] The squeeze rollers are grouped in the cleaning section of the continuous production line, with one squeeze roller at the top and one at the bottom forming a squeeze roller group.

[0055] The equipment used in the protection method includes a front turning roller of the cleaning section, a seam detection device, a squeezing roller group, a PLC control device, and a transmission device.

[0056] The front turning roller of the cleaning section is used to turn the strip. The front turning roller of the cleaning section is equipped with a detection point for the seam detection device and an encoder for calculating the travel length of the strip.

[0057] The seam detection device is used to detect whether there is a seam at the strip and to calculate the length of the seam passing through the seam detection device. The detection information and calculation results of the seam detection device are transmitted to the PLC control equipment.

[0058] The squeezing roller assembly in the cleaning section is used to remove impurities and liquids from the surface of the strip. The upper roller of the squeezing roller assembly is driven by a cylinder to lift and lower, while the lower roller is a fixed roller. The rotation of the squeezing rollers is driven by an external power source.

[0059] The thickness of the strip seam is greater than that of other parts of the strip; the seam detection device uses its laser rangefinder to measure the distance between the instrument and the strip surface to determine whether there is a strip seam at the point where the seam detection device passes;

[0060] When the front end of the strip seam enters the detection area of ​​the seam detection device, the distance measured by the laser rangefinder will change abruptly. When the rear end of the strip seam passes through the detection area of ​​the seam detection device, the distance measured by the laser rangefinder will also change abruptly. The time between the two abrupt changes is the time it takes for the strip seam to pass through the seam detection device.

[0061] The protection method includes the following calculation and derivation process;

[0062] Step 1: ① When the strip seam (front end) runs to the 3 o'clock position of the turning roller in the cleaning section, the seam detection device detects the strip seam and sends a rising edge signal to the PLC control device, and records the current time point T1.

[0063] ② When the suture opening (rear end) leaves the detection position of the suture opening detection device, a falling edge signal is sent to the PLC, and the current time point T2 is recorded;

[0064] ③ The length of the seam (X0) of the strip is calculated by the product of the time difference (T2-T1) between the two signals and the strip speed (v0), and the formula is X0 = (T2-T1)*v0;

[0065] The meanings of the relevant parameters in the above formula are as follows:

[0066] X0: The length of the strip seam calculated by the seam detection device, in meters;

[0067] T2: The time when the rear end of the suture leaves the detection position of the suture detection device, in seconds;

[0068] T1: The moment when the suture detection device detects the front end of the suture in the strip, in seconds;

[0069] v0: The running speed of the strip in the cleaning section, m / s;

[0070] ④ Record the moment when the suture (rear end) leaves the suture detection device as time t0.

[0071] Step 2: ① A seam detection device is installed at the 3 o'clock position of the front guide roller of the cleaning section with radius R. Use the following formula to calculate the distance l from the 12 o'clock position of the front guide roller of the cleaning section to the midpoint of the Nth squeeze roller of the cleaning section. N (N = 1, 2, 3...), then calculate the total length L from the seam detection device to the midpoint of the Nth squeezing roller in the cleaning section. N (N = 1, 2, 3...);

[0072] ② Let t be the time it takes for the Nth squeezing roller group to continuously complete the lifting and lowering action. NRD ; Calculate the distance x from the front end of the seam to the front of the Nth squeeze roller based on the strip speed v0.N The automatic lifting and lowering motion begins; the moment t at which the tip of the suture reaches this point... NA The result is calculated based on the detection location and time point T2 of the suture detection device and the strip speed v0.

[0073] Formula 1;

[0074] Formula 2;

[0075] Formula 3;

[0076] Note: N represents the number of squeezing rollers in the washing section;

[0077] The meanings of the relevant parameters in Formula 1, Formula 2, and Formula 3 are as follows:

[0078] L N : The total length from the seam detection device installed at the 3 o'clock position of the front guide roller of the cleaning section to the midpoint of the N squeeze roller of the cleaning section (N=1,2,3...), in meters;

[0079] R: The radius of the guide roller before the cleaning section, in meters;

[0080] l N : This is the distance from the 12 o'clock position of the front guide roller of the cleaning section to the midpoint of the Nth squeezing roller of the cleaning section, where N = 1, 2, 3..., and the unit is m;

[0081] X N : This is the distance from the front end of the seam to the front of the Nth squeeze roller, in meters;

[0082] t NRD : The time it takes for the Nth squeezing roller group to continuously complete the lifting and lowering action, in seconds;

[0083] t NA : The moment when the front end of the seam reaches the point where the N-number squeezing roller begins to lift, in seconds.

[0084] In step S4, the squeeze roller automatically descends after passing through the seam opening to squeeze out the liquid on the surface of the strip to prevent cross-contamination of the cleaning solution at different locations in the cleaning section.

[0085] The squeeze roller is a soft rubber roller.

[0086] In this example, the drive unit for driving the squeeze rollers uses a Siemens S120 or G120 series to control the rotation of the motor.

Claims

1. A method for protecting the surface quality of squeeze rollers in the cleaning section of a continuous production line, characterized in that: The protection method Includes the following steps; Step S1: Use the strip seam detection device at the front guide roller of the cleaning section to detect whether the strip seam is passing and the length of the seam, and use the encoder to collect the diameter of the front guide roller of the cleaning section. Step S2: When the strip seam is detected to pass through, calculate the time it takes for the strip seam to reach each set of squeeze rollers based on the distance from the squeeze rollers at different positions to the strip seam and the strip conveying speed of the production line. Step S3: Based on the time calculation result of step S2, the squeeze roller automatically rises to avoid the seam opening when it reaches the front of the squeeze roller. To prevent the squeeze rollers from being scratched by the strip seam; Step S4: Calculate the time required for the suture to pass through the area below the squeeze roller based on the suture length and the diameter of the guide roller before the cleaning section, so that the squeeze roller automatically descends after passing through the suture. The thickness of the strip seam is greater than that of other parts of the strip; the seam detection device uses its laser rangefinder to measure the distance between the instrument and the strip surface to determine whether there is a strip seam at the point where the seam detection device passes; When the front end of the strip seam enters the detection area of ​​the seam detection device, the distance measured by the laser rangefinder will change abruptly. When the rear end of the strip seam passes through the detection area of ​​the seam detection device, the distance measured by the laser rangefinder will also change abruptly. The time between the two abrupt changes is the time it takes for the strip seam to pass through the seam detection device. The protection method includes the following calculation and derivation process; Step 1: ① When the front end of the strip seam reaches the 3 o'clock position of the front turning roller in the cleaning section, the seam detection device detects the strip seam and sends a rising edge signal to the PLC control device, and records the current time point T1. ② When the rear end of the suture joint leaves the detection position of the suture joint detection device, a falling edge signal is sent to the PLC, and the current time point T2 is recorded; ③ The strip seam length X0 is calculated by the product of the time difference T2-T1 between the two signals and the strip speed v0, with the formula X0 = (T2-T1)*v0; The meanings of the relevant parameters in the above formula are as follows: X0: The length of the strip seam calculated by the seam detection device, in meters; T2: The time when the rear end of the suture leaves the detection position of the suture detection device, in seconds; T1: The moment when the suture detection device detects the front end of the suture in the strip, in seconds; v0: The running speed of the strip in the cleaning section, m / s; Step 2: ① Install a seam detection device at the 3 o'clock position of the front guide roller of the cleaning section with radius R. The distance l from the 12 o'clock position of the front guide roller of the cleaning section to the midpoint of the Nth squeeze roller of the cleaning section. N N = 1, 2, 3..., then use the following formula to calculate the total length L from the seam detection device to the midpoint of the Nth squeezing roller in the cleaning section. N ; ② Let t be the time it takes for the Nth squeezing roller group to continuously complete the lifting and lowering action. NRD ; Calculate the distance x from the front end of the seam to the front of the Nth squeeze roller based on the strip speed v0. N The automatic lifting and lowering motion begins; the moment t at which the tip of the suture reaches this point... NA Calculated according to Formula 3; Formula 1; Formula 2; Formula 3; The meanings of the relevant parameters in Formula 1, Formula 2, and Formula 3 are as follows: L N : The total length from the seam detection device installed at the 3 o'clock position of the front guide roller of the cleaning section to the midpoint of the N squeeze roller of the cleaning section (N=1,2,3...), in meters; R: The radius of the guide roller before the cleaning section, in meters; l N : This is the distance from the 12 o'clock position of the front guide roller of the cleaning section to the midpoint of the Nth squeezing roller of the cleaning section, where N = 1, 2, 3..., and the unit is m; X N : This is the distance from the front end of the seam to the front of the Nth squeeze roller, in meters; t NRD : The time it takes for the Nth squeezing roller group to continuously complete the lifting and lowering action, in seconds; t NA : The moment when the front end of the seam reaches the point where the N-number squeezing roller begins to lift, in seconds.

2. The method for protecting the surface quality of squeeze rollers in the cleaning section of a continuous production line according to claim 1, characterized in that: The squeeze rollers are grouped in the cleaning section of the continuous production line, with one squeeze roller at the top and one at the bottom forming a squeeze roller group.

3. A method for protecting the surface quality of squeeze rollers in the cleaning section of a continuous production line according to claim 2, characterized in that: The equipment used in the protection method includes a front turning roller of the cleaning section, a seam detection device, a squeezing roller group, a PLC control device, and a transmission device. The front turning roller of the cleaning section is used to turn the strip. The front turning roller of the cleaning section is equipped with a detection point for the seam detection device and an encoder for calculating the travel length of the strip. The seam detection device is used to detect whether there is a seam at the strip and to calculate the length of the seam passing through the seam detection device. The detection information and calculation results of the seam detection device are transmitted to the PLC control equipment. The squeezing roller assembly in the cleaning section is used to remove impurities and liquids from the surface of the strip. The upper roller of the squeezing roller assembly is driven by a cylinder to lift and lower, while the lower roller is a fixed roller. The rotation of the squeezing rollers is driven by an external power source.

4. A method for protecting the surface quality of squeeze rollers in the cleaning section of a continuous production line according to claim 1, characterized in that: In step S4, the squeeze roller automatically descends after passing through the seam opening to squeeze out the liquid on the surface of the strip to prevent cross-contamination of the cleaning solution at different locations in the cleaning section.

5. A method for protecting the surface quality of squeeze rollers in the cleaning section of a continuous production line according to claim 1, characterized in that: The squeeze roller is a soft rubber roller.

Images