Tension control device of organic coating equipment

Abstract

The invention provides a tension control device of organic coating equipment, which can control small target tension and overcome unbalanced winding and unwinding rotation resistance moment, the control device comprises an unwinding shaft, a cold drum and a winding shaft which are used for sequentially winding a base film, and an unwinding tension detection roller is arranged between the unwinding shaft and the cold drum; a winding tension detection roller is arranged between the winding shaft and the cold drum, a first sensor and a second sensor are arranged on the unwinding tension detection roller and the winding tension detection roller respectively, and a first detector and a second detector are arranged on one side of the unwinding shaft and one side of the winding shaft respectively. The tension control device further comprises a speed detector used for detecting the rotating linear speed of the cold drum and a control module which is electrically connected with the speed detector, the first sensor, the second sensor, the first detector and the second detector and can control the rotating angular speed of the unwinding shaft and the rotating angular speed of the winding shaft.

Description

[0001] This application is a divisional application. The application number of the original application is 2021112033472, the application date is October 15, 2021, and the invention title is "Tension Control Device and Control Method for an Organic Coating Equipment". Technical Field

[0002] The present invention relates to the field of organic coating, in particular to a tension control device and control method for an organic coating equipment. Background Art

[0003] In the conventional coating tension control mode, the take-up and pay-off reels (take-up roller, pay-off roller) basically adopt a torque control mode. The tension controller compares the current tension with the set target tension, and then controls the reverse torque of the take-up and pay-off reels to achieve tension control. Due to the existence of mechanical manufacturing errors and installation measurement errors, the resistance at each angle of the take-up / reel-off is different, and there may be a sudden increase in the resistance at a certain point, resulting in tension fluctuations.

[0004] In this torque control mode, the film running mainly relies on the friction between the cold drum and the base film. When the cold drum rotates, it drives the base film to wind between the pay-off reel and the take-up reel. The problem is that the controlled target tension cannot be too small. If the target tension is too small, the base film will float on the surface of the cold drum and cannot drive the base film to transmit. Therefore, the friction between the cold drum and the base film is unstable, resulting in the inability to control the coating with a small tension. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a tension control device and control method for an organic coating equipment that can control a small target tension and overcome the imbalance of the rotational resistance torque of the take-up and pay-off.

[0006] The object of the present invention is achieved as follows: A tension control device for an organic coating equipment, including a pay-off reel, a cold drum, and a take-up reel for the base film to wind successively. A pay-off tension detection roller is provided between the pay-off reel and the cold drum, and a take-up tension detection roller is provided between the take-up reel and the cold drum. A first sensor for detecting the pay-off tension and a second sensor for detecting the take-up tension are respectively provided on the pay-off tension detection roller and the take-up tension detection roller. A first detector for detecting the diameter of the pay-off reel and a second detector for detecting the diameter of the take-up reel are respectively provided on one side of the pay-off reel and the take-up reel. The tension control device further includes a speed detector for detecting the rotational linear velocity of the cold drum and a control module that is electrically connected to the speed detector, the first sensor, the second sensor, the first detector, and the second detector and can control the rotational angular velocity of the pay-off reel and the take-up reel.

[0007] A tension control device for an organic coating equipment as described above, wherein a cold drum driving motor for driving the rotation of the cold drum and electrically connected to the control module is provided on the cold drum, a unwind driving motor for driving the rotation of the unwind reel and electrically connected to the control module is provided on the unwind reel, and a winding driving motor for driving the rotation of the winding reel and electrically connected to the control module is provided on the winding reel.

[0008] A tension control device for an organic coating equipment as described above, wherein a speed measuring roller is provided between the cold drum and the unwind reel, and the speed detector is a speed encoder and is provided at the end of the speed measuring roller.

[0009] A tension control device for an organic coating equipment as described above, wherein both the first detector and the second detector are laser rangefinders.

[0010] A tension control device for an organic coating equipment as described above, wherein guide rollers are provided between the unwind reel and the cold drum and between the winding reel and the cold drum.

[0011] A tension control device for an organic coating equipment as described above, wherein the control module is provided with a PID controller electrically connected to the unwind driving motor and the winding driving motor to control their acceleration or deceleration.

[0012] The control method of the tension control device of an organic coating equipment as described above includes the following steps: Film running: The unwinding drive motor drives the unwinding shaft to rotate, the cold drum drive motor drives the cold drum to rotate, and the winding drive motor drives the winding shaft to rotate, so as to drive the base film to move between the unwinding shaft, the cold drum and the winding shaft; Speed measurement: The speed detector detects the film running speed and transmits the speed information to the control module; Winding tension detection: The second sensor detects the winding tension and transmits the winding tension information to the control module; Unwinding tension detection: The first sensor detects the unwinding tension and transmits the unwinding tension information to the control module; Judging the tension magnitude: The control module judges whether the winding tension and the unwinding tension are equal to the target winding tension and the target unwinding tension. If the winding tension and the unwinding tension are equal to the target winding tension and the target unwinding tension, there is no need to adjust the speed of the winding shaft and the unwinding shaft; Winding speed adjustment: When the control module judges that the winding tension is greater than the target winding tension, the control module controls the winding drive motor to decelerate through the PID controller. When the control module judges that the winding tension is less than the target winding tension, the control module controls the winding drive motor to accelerate through the PID controller; Until the control module judges that the winding tension is equal to the target winding tension, the winding drive motor maintains the current speed and continues to run; Unwinding speed adjustment: When the control module judges that the unwinding tension is greater than the target unwinding tension, the control module controls the unwinding drive motor to accelerate through the PID controller. When the control module judges that the unwinding tension is less than the target unwinding tension, the control module controls the unwinding drive motor to decelerate through the PID controller; Until the control module judges that the unwinding tension is equal to the target unwinding tension, the unwinding drive motor maintains the current speed and continues to run.

[0013] The control method of the tension control device of an organic coating equipment as described above includes the following steps: Coil diameter detection: In the steps of winding speed adjustment and unwinding speed adjustment, the first detector and the second detector respectively detect the coil diameters of the unwinding shaft and the winding shaft, and transmit the corresponding coil diameter information to the control module. The control module calculates the circumferences of the current unwinding shaft and the winding shaft respectively, and calculates the current linear speeds of the unwinding shaft and the winding shaft.

[0014] The control method of the tension control device of an organic coating equipment as described above, in the step of coil diameter detection, adopts a two-second smoothing superposition filtering method to calculate the coil diameter values of the current unwinding shaft and the winding shaft, with a resolution of 100 ms and a superposition times of 20 times.

[0015] The control method of the tension control device of an organic coating equipment as described above, in the steps of unwinding speed adjustment and winding speed adjustment, the adjusted unwinding drive motor and winding drive motor respectively drive the unwinding shaft and the winding shaft to rotate between 0.9 times and 1.1 times of the current linear speed.

[0016] Compared with the prior art, the present invention can compare the actual winding tension and unwinding tension with the target tension, and adjust the winding tension and unwinding tension to the same tension value as the target tension in real time. Moreover, the unwinding shaft and the winding shaft are respectively driven by an unwinding drive motor and a winding drive motor. When the friction between the base film and the cold drum is unstable, the overall stability of the tension can be ensured under the drive of the unwinding drive motor and the winding drive motor. Therefore, the present invention can effectively solve the technical problem that the control target tension cannot be too small, and also overcome the technical problem of uneven resistance torque when the unwinding and winding shafts rotate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following further describes in detail the specific embodiments of the present invention with reference to the drawings, where: Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic electrical connection structure diagram of the control module of the present invention; Figure 3 is a schematic control flow diagram of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] A tension control device for an organic coating equipment includes an unwinding shaft 1 (unwinding roller), a cold drum 2, and a winding shaft 3 (winding roller) for sequentially winding a base film 10. An unwinding tension detection roller 4 is provided between the unwinding shaft 1 and the cold drum 2, and a winding tension detection roller 5 is provided between the winding shaft 3 and the cold drum 2. A first sensor 6 for detecting the unwinding tension and a second sensor 7 for detecting the winding tension are respectively provided on the unwinding tension detection roller 4 and the winding tension detection roller 5. A first detector 8 for detecting the diameter of the unwinding shaft 1 and a second detector 9 for detecting the diameter of the winding shaft 3 are respectively provided on one side of the unwinding shaft 1 and the winding shaft 3. The tension control device further includes a speed detector 20 for detecting the rotational linear speed of the cold drum 2 and a control module 100 that is electrically connected to the speed detector 20, the first sensor 6, the second sensor 7, the first detector 8, and the second detector 9 and can control the rotational angular velocity of the unwinding shaft 1 and the winding shaft 3.

[0019] To achieve respective drives, a cold drum drive motor 21 that drives the cold drum 2 to rotate and is electrically connected to the control module 100 is provided on the cold drum 2, an unwinding drive motor 11 that drives the unwinding shaft 1 to rotate and is electrically connected to the control module 100 is provided on the unwinding shaft 1, and a winding drive motor 31 that drives the winding shaft 3 to rotate and is electrically connected to the control module 100 is provided on the winding shaft 3.

[0020] A speed measuring roller 200 is provided between the cold drum 2 and the unwinding shaft 1, and the speed detector 20 is a speed encoder and is provided at the end of the speed measuring roller 200.

[0021] Preferably, both the first detector 8 and the second detector 9 are laser rangefinders.

[0022] To further ensure the flatness of the base film 10 and prevent it from wrinkling, guide rollers 300 are provided between the unwinding reel 1 and the cold drum 2, and between the winding reel 3 and the cold drum 2.

[0023] The control module 100 is provided with a PID controller electrically connected to the unwinding drive motor 11 and the winding drive motor 31 to control their acceleration or deceleration. The control module 100 can adopt a Beckhoff PLC controller. The first sensor 6 and the second sensor 7 are pressure sensors, which are respectively arranged at the ends of the unwinding reel 1 and the winding reel 3.

[0024] A control method for a tension control device of an organic coating equipment includes the following steps: film running, the unwinding drive motor 11 drives the unwinding reel 1 to rotate (clockwise), the cold drum drive motor 21 drives the cold drum to rotate (clockwise), and the unwinding drive motor 11 drives the winding reel 3 to rotate (counterclockwise), so as to drive the base film 10 to move between the unwinding reel 1, the cold drum 2 and the winding reel 3; speed measurement, the speed detector 20 detects the running speed of the film and transmits the speed information (i.e., the linear speed of the rotation of the cold drum 2) to the control module 100 (as the reference speed for film running); winding tension detection, the second sensor 7 detects the winding tension and transmits the winding tension information to the control module 100; unwinding tension detection, the first sensor 6 detects the unwinding tension and transmits the unwinding tension information to the control module 100; judging the tension magnitude, the control module 100 judges whether the winding tension and the unwinding tension are equal to the target winding tension and the target unwinding tension. If the winding tension and the unwinding tension are equal to the target winding tension and the target unwinding tension, there is no need to adjust the speeds of the winding reel 3 and the unwinding reel 1; winding speed adjustment, when the control module 100 judges that the winding tension is greater than the target winding tension, the control module 100 controls the winding drive motor 31 to decelerate through the PID controller. When the control module 100 judges that the winding tension is less than the target winding tension, the control module 100 controls the winding drive motor 31 to accelerate through the PID controller; until the control module 100 judges that the winding tension is equal to the target winding tension, the winding drive motor 31 maintains the current speed and continues to run; unwinding speed adjustment, when the control module 100 judges that the unwinding tension is greater than the target unwinding tension, the control module 100 controls the unwinding drive motor 11 to accelerate through the PID controller. When the control module 100 judges that the unwinding tension is less than the target unwinding tension, the control module 100 controls the unwinding drive motor 11 to decelerate through the PID controller; until the control module 100 judges that the unwinding tension is equal to the target unwinding tension, the unwinding drive motor 11 maintains the current speed and continues to run.

[0025] The control method of the tension control device of the above-mentioned organic coating equipment includes the following steps: coil diameter detection. In the steps of winding speed regulation and unwinding speed regulation, the first detector 8 and the second detector 9 respectively detect the coil diameters of the unwinding shaft 1 and the winding shaft 3, and transmit the corresponding coil diameter information to the control module 100. The control module 100 calculates the circumferences of the current unwinding shaft 1 and winding shaft 3 respectively, and calculates the current linear speeds of the unwinding shaft 1 and the winding shaft 3.

[0026] In the step of coil diameter detection, a two-second smoothing superimposed filtering method is used to calculate the coil diameter values of the current unwinding shaft 1 and winding shaft 3. Its resolution is 100 ms, and the number of superimpositions is 20 times, so as to calculate a stable coil diameter value (refresh speed 100 ms), and obtain the accurate circumferences and respective linear speeds of the current unwinding shaft 1 and winding shaft 3, so as to obtain more accurate unwinding speeds and winding speeds of the base film 10 on the unwinding shaft 1 and the winding shaft 3, and then control the unwinding drive motor 11 and the winding drive motor 31 to operate stably at the specified linear speed, and the stability control effect of the tension is better.

[0027] In the steps of unwinding speed regulation and winding speed regulation, the speed-regulated unwinding drive motor 11 and winding drive motor 31 respectively drive the unwinding shaft 1 and the winding shaft 3 to rotate between 0.9 times and 1.1 times of the current linear speed (the speed adjustment amount is maintained within a certain and controllable limit range).

Claims

1. A tension control device for an organic coating equipment, characterized in that: It includes an unwinding shaft (1), a cold drum (2), and a winding shaft (3) for sequentially winding the base film (10). A unwinding tension detection roller (4) is provided between the unwinding shaft (1) and the cold drum (2), and a winding tension detection roller (5) is provided between the winding shaft (3) and the cold drum (2). A first sensor (6) for detecting the unwinding tension and a second sensor (7) for detecting the winding tension are respectively provided on the unwinding tension detection roller (4) and the winding tension detection roller (5). A first detector (8) for detecting the diameter of the unwinding shaft (1) and a second detector (9) for detecting the diameter of the winding shaft (3) are respectively provided on one side of the unwinding shaft (1) and the winding shaft (3). The tension control device further includes a speed detector (20) for detecting the rotational linear speed of the cold drum (2) and a control module (100) electrically connected to the speed detector (20), the first sensor (6), the second sensor (7), the first detector (8), and the second detector (9) and capable of controlling the rotational angular velocity of the unwinding shaft (1) and the winding shaft (3); The control method of the tension control device of the organic coating equipment described above includes the following steps: A: Film running. The unwinding drive motor (11) drives the unwinding shaft (1) to rotate, the cold drum drive motor (21) drives the cold drum to rotate, and the unwinding drive motor (11) drives the winding shaft (3) to rotate, so as to drive the base film (10) to move between the unwinding shaft (1), the cold drum (2), and the winding shaft (3); B: Speed measurement. The speed detector (20) detects the film running speed and transmits the speed information to the control module (100); C: Winding tension detection. The second sensor (7) detects the winding tension and transmits the winding tension information to the control module (100); D: Unwinding tension detection. The first sensor (6) detects the unwinding tension and transmits the unwinding tension information to the control module (100); E: Judging the tension magnitude. The control module (100) judges whether the winding tension and the unwinding tension are equal to the target winding tension and the target unwinding tension. If the winding tension and the unwinding tension are equal to the target winding tension and the target unwinding tension, there is no need to adjust the speed of the winding shaft (3) and the unwinding shaft (1); F: Winding speed adjustment. When the control module (100) judges that the winding tension is greater than the target winding tension, the control module (100) controls the winding drive motor (31) to decelerate through the PID controller. When the control module (100) judges that the winding tension is less than the target winding tension, the control module (100) controls the winding drive motor (31) to accelerate through the PID controller; until the control module (100) judges that the winding tension is equal to the target winding tension, the winding drive motor (31) maintains the current speed and continues to run; G: Unwinding speed regulation. When the control module (100) determines that the unwinding tension is greater than the target unwinding tension, the control module (100) controls the unwinding drive motor (11) to accelerate through the PID controller. When the control module (100) determines that the unwinding tension is less than the target unwinding tension, the control module (100) controls the unwinding drive motor (11) to decelerate through the PID controller. Until the control module (100) determines that the unwinding tension is equal to the target unwinding tension, the unwinding drive motor (11) maintains the current speed and continues to operate.

2. The tension control device of an organic coating equipment according to claim 1, characterized in that A cold drum drive motor (21) for driving the rotation of the cold drum (2) and electrically connected to the control module (100) is provided on the cold drum (2). An unwinding drive motor (11) for driving the rotation of the unwinding shaft (1) and electrically connected to the control module (100) is provided on the unwinding shaft (1). A winding drive motor (31) for driving the rotation of the winding shaft (3) and electrically connected to the control module (100) is provided on the winding shaft (3).

3. The tension control device of an organic coating equipment according to claim 1 or 2, characterized in that A speed measuring roller (200) is provided between the cold drum (2) and the unwinding shaft (1). The speed detector (20) is a speed encoder and is provided at the end of the speed measuring roller (200).

4. The tension control device of an organic coating equipment according to claim 1, characterized in that Both the first detector (8) and the second detector (9) are laser rangefinders.

5. The tension control device of an organic coating equipment according to claim 1, characterized in that Guide rollers (300) are provided between the unwinding shaft (1) and the cold drum (2) and between the winding shaft (3) and the cold drum (2).

6. The tension control device of an organic coating equipment according to claim 2, wherein The control module (100) is provided with a PID controller electrically connected to the unwinding drive motor (11) and the winding drive motor (31) to control their acceleration or deceleration.

7. The tension control device of an organic coating equipment according to claim 1, wherein: The control method of the tension control device of the organic coating equipment further includes the following steps: H: Coil diameter detection. In the steps of winding speed regulation and unwinding speed regulation, the first detector (8) and the second detector (9) respectively detect the coil diameters of the unwinding shaft (1) and the winding shaft (3), and transmit the corresponding coil diameter information to the control module (100). The control module (100) calculates the circumferences of the current unwinding shaft (1) and winding shaft (3) respectively, and calculates the current linear speeds of the unwinding shaft (1) and the winding shaft (3).

8. The tension control device of an organic coating equipment according to claim 7, characterized in that In the step of coil diameter detection, a smoothing superposition filtering method of two seconds is used to calculate the coil diameter values of the current unwinding shaft (1) and winding shaft (3), with a resolution of 100 ms and a superposition times of 20 times.

9. The tension control device of an organic coating equipment according to claim 7 or 8, characterized in that In the steps of unwinding speed regulation and winding speed regulation, the unwinding drive motor (11) and the winding drive motor (31) after speed regulation respectively drive the unwinding shaft (1) and the winding shaft (3) to rotate between 0.9 times and 1.1 times of the current linear speed.

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