Rotation positioning method for transmission roller of rolling machine

Abstract

The invention relates to the technical field of rolling machines, in particular to a rolling machine driving roller rotation positioning method which comprises the following steps: step 1, when the output frequency of a frequency converter of a driving roller motor reaches an output frequency set value, calculating the total actual rotation displacement of a driving roller in an acceleration time period and a deceleration time period; 2, according to the total displacement of actual rotation of the transmission roller, the length of the steel coil not wrapped with the antirust paper is calculated; 3, the total time T from starting of a transmission roller motor to completion of antirust paper positioning is calculated according to the length, not wrapped with the antirust paper, of the steel coil, the transmission roller motor automatically stops after T seconds after starting, and the antirust paper rotates along with the steel coil to complete positioning; according to the method, mounting and positioning of the antirust paper on the steel coil are achieved only through a mathematical method, the workload of repeated operation of an operator is reduced, meanwhile, positioning equipment such as an encoder is reduced, and the equipment cost is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of roll wrapping machines, and more specifically, to a method for rotating and positioning a driving roller of a roll wrapping machine. Background Art

[0002] The cold rolling packaging line is responsible for packaging finished steel coils. First, an anti-rust paper is wound around the outer circle of the steel coil by a roll wrapping machine, then a film bag is put on, and finally it is fixed with a galvanized retaining ring and strapped and shipped. The roll wrapping machine is a device in which a motor drives a driving roller to rotate through a speed reducer, and the steel coil rotates with the driving roller. The anti-rust paper is first adhered to the 10 o'clock direction of the steel coil, and then the motor of the driving roller is started. After the anti-rust paper rotates one circle with the steel coil, the motor of the driving roller stops. Currently, for the positioning of the wrapping paper of the roll wrapping machine, it is mainly measured manually, which causes great labor intensity for the staff and low work efficiency, or positioning equipment such as an encoder is used for measurement and positioning, resulting in high equipment costs.

[0003] The applicant found through retrieval that a Chinese patent document with the publication number of 206241003U disclosed a new type of roll wrapping machine on June 13, 2017, including a hydraulic station, a gasket and a spring. A hydraulic station and a driving motor are provided at the bottom of the base, and the driving motor is rotatably connected to the main roller. A slide rail is provided at the top of the base, and a slide plate is arranged on the slide rail. One end of the slide plate is equipped with an auxiliary roller, and a through hole is opened on the base. The hydraulic station is connected to the hydraulic cylinder through a oil pipe, and the oil pipe passes through the through hole. A gasket is arranged at the through hole of the oil pipe, and a spring is arranged between the gasket and the snap ring. This device also cannot solve the above technical problems.

[0004] Therefore, in order to improve or solve at least one of the above problems, a method for rotating and positioning a driving roller of a roll wrapping machine that can automatically position the installation position of the anti-rust paper on the steel coil is required. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for rotating and positioning a driving roller of a roll wrapping machine that can automatically position the installation position of the anti-rust paper on the steel coil.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is: a method for rotating and positioning a driving roller of a roll wrapping machine, including the following steps:

[0007] Step 1: When the output frequency of the frequency converter of the driving roller motor reaches the set output frequency value, calculate the total actual rotation displacement of the driving roller during the acceleration period and the deceleration period;

[0008] Step 2: Calculate the length of the steel coil without the anti-rust paper wrapped according to the total actual rotation displacement of the driving roller;

[0009] Step 3: Calculate the total time T from the start of the driving roller motor to the completion of the positioning of the rust-proof paper according to the length of the steel coil without the rust-proof paper wrapped. The driving roller motor automatically stops after T seconds of starting, and the rust-proof paper rotates with the steel coil to complete the positioning.

[0010] The said Step 1 includes:

[0011] Step 11: Calculate the rotational speed of the driving roller when the output frequency of the frequency converter of the driving roller motor reaches the frequency set value, that is:

[0012]

[0013] Wherein, n is the rated rotational speed of the driving roller motor; i is the reduction ratio of the speed reducer; f_set is the output frequency set value of the frequency converter of the driving roller motor; f_max is the maximum output frequency of the frequency converter of the driving roller motor; Nc is the rotational speed of the driving roller when the output frequency of the frequency converter of the driving roller motor reaches f_set.

[0014] In the said Step 1, in the time period of 0 - t1, the rotational speed of the driving roller gradually increases from 0 to Nc; in the time period of t1 - t2, the driving roller maintains a constant speed, and the rotational speed of the driving roller is Nc; in the time period of t2 - t3, the rotational speed of the driving roller gradually decreases from Nc to 0; wherein t1 is the time point when the output frequency of the frequency converter of the driving roller motor reaches f_set; t2 is the time point when the output frequency of the frequency converter of the driving roller motor starts to decrease from f_set; t3 is the time point when the output frequency of the frequency converter of the driving roller motor decreases to 0.

[0015] The said Step 1 further includes:

[0016] Step 12: Calculate the number of turns of the driving roller in the time period of 0 - t1, that is:

[0017]

[0018] Where S01 is the number of turns of the driving roller in the time period of 0 - t1;

[0019] Calculate the number of turns of the driving roller in the time period of t2 - t3, that is:

[0020]

[0021] Where S23 is the number of turns of the driving roller in the time period of t2 - t3; t23 = t3 - t2, and t23 is the falling duration of the output frequency of the frequency converter of the driving roller motor from f_set to 0;

[0022] Calculate the total number of turns S1 of the driving roller in the time periods of 0 - t1 and t2 - t3, that is:

[0023] S1 = S01 + S23.

[0024] Step 1 further includes:

[0025] Step 13: Measure the circumference of the drive roller, and calculate the total displacement of the drive roller rotating in the time periods of 0 - t1 and t2 - t3, that is:

[0026] S11 = C1 × S1;

[0027] where C1 is the circumference of the drive roller; S11 is the total displacement of the drive roller actually rotating in the time periods of 0 - t1 and t2 - t3.

[0028] Step 2 includes:

[0029] Step 21: Calculate the circumference of the steel coil, that is:

[0030] C = 2Π × R;

[0031] where C is the circumference of the steel coil; R is the radius of the steel coil.

[0032] Step 2 further includes:

[0033] Step 22: The total displacement of the drive roller actually rotating is equal to the rotational displacement of the steel coil; calculate the length of the steel coil without wrapping anti - rust paper, that is:

[0034] L = C - S11;

[0035] where L is the length of the steel coil without wrapping anti - rust paper.

[0036] Step 3 includes:

[0037] Step 31: Calculate the time taken for the drive roller to rotate the length L in the time period of t1 - t2, that is:

[0038]

[0039] where t12 is the time taken for the drive roller to rotate the length L.

[0040] Step 3 further includes:

[0041] Step 32: Calculate the total time from the start of the drive roller motor to the completion of the anti - rust paper positioning, that is:

[0042] T = (t1 + t12 + t23) × kt,

[0043] where T is the total time from the start of the drive roller motor to the completion of the anti - rust paper positioning; kt is the time compensation coefficient obtained from human experiments.

[0044] Step 3 further includes:

[0045] Step 33: Calculate kt, that is:

[0046]

[0047] Wherein, cum is the cumulative material consumption value of n coils calculated according to the radius of the steel coil after packaging n coils; L3_cum is the actual cumulative material consumption value.

[0048] The beneficial effects of the present invention are as follows:

[0049] Without using detection devices such as encoders, the present invention uses a mathematical method to inversely deduce the time T required for the drive roller motor to package one steel coil according to the radius of the steel coil. After the drive roller motor is started, it automatically stops after T seconds. At this time, the anti-rust paper is positioned as the steel coil rotates; the workload of repeated operations by the operator is reduced, and at the same time, positioning devices such as encoders are reduced, saving equipment costs; the present invention can be programmed into a PLC control module, making the use and promotion of the present invention simple and efficient. Description of the Drawings

[0050] The following further details the specific embodiments of the present invention in conjunction with the drawings, wherein:

[0051] Figure 1 is a schematic structural diagram of the rolling wrapper of the present invention.

[0052] Figure 2 is a diagram showing the relationship between the rotational speed and time of the drive roller of the present invention.

[0053] Figure 3 is the HMI control screen of the present invention.

[0054] The markings in the above figures are all:

[0055] The markings in the figure are:

[0056] 1. Drive roller motor,

[0057] 2. Drive roller, 201. Driven roller,

[0058] 3. Steel coil, 301. Anti-rust paper pasting line,

[0059] 4. Reducing box. Specific Embodiments

[0060] The following further details the specific embodiments of the present invention in conjunction with the drawings through the description of the embodiments, aiming to help those skilled in the art have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention, and contribute to its implementation.

[0061] A method for rotating and positioning a transmission roller of a wrapping machine, comprising the following steps:

[0062] Step 1: When the output frequency of the frequency converter of the transmission roller motor 1 reaches the set output frequency value, calculate the total displacement actually rotated by the transmission roller 2 during the acceleration period and the deceleration period;

[0063] Step 2: Calculate the length of the steel coil 3 without the anti-rust paper wrapped according to the total displacement actually rotated by the transmission roller 2;

[0064] Step 3: Calculate the total time T from the start of the transmission roller motor 1 to the completion of the positioning of the anti-rust paper according to the length of the steel coil 3 without the anti-rust paper wrapped. After the transmission roller motor 1 starts, it automatically stops after T seconds, and the anti-rust paper rotates with the steel coil 3 to complete the positioning.

[0065] In Step 1, calculate the displacement actually rotated by the transmission roller 2 during the acceleration time and the deceleration time. In Step 2, since the transmission roller 2 and the steel coil 3 are in tangential operation, the displacement rotated by the transmission roller 2 is equal to the displacement rotated by the steel coil 3. Subtract the displacement rotated by the steel coil 3 from the circumference of the steel coil 3 to obtain the length of the steel coil 3 without the anti-rust paper wrapped. In Step 3, calculate the time consumed for the transmission roller 2 to rotate the length of the steel coil 3 without the anti-rust paper wrapped at a constant speed, and add the acceleration time and the deceleration time of the transmission roller 2 to obtain the complete time required to wrap the anti-rust paper around the steel coil 3 once. After the transmission roller motor 1 starts, it automatically stops after T seconds, and at this time, the anti-rust paper rotates with the steel coil to complete the positioning.

[0066] Step 1 includes:

[0067] Step 11: Calculate the rotational speed of the transmission roller 2 when the output frequency of the frequency converter of the transmission roller motor 1 reaches the set frequency value, that is:

[0068]

[0069] Among them, n is the rated rotational speed of the transmission roller motor 1; i is the reduction ratio of the reduction gearbox 4; f_set is the set output frequency value of the frequency converter of the transmission roller motor 1; f_max is the maximum output frequency of the frequency converter of the transmission roller motor 1; Nc is the rotational speed of the transmission roller 2 when the output frequency of the frequency converter of the transmission roller motor 1 reaches f_set.

[0070] The rated rotational speed n of the transmission roller motor 1, the reduction ratio i of the reduction gearbox 4, the set output frequency value f_set of the frequency converter of the transmission roller motor 1, and the maximum output frequency f_max of the frequency converter of the transmission roller motor 1 are all fixed values; Nc can be calculated through the formula; the unit of n is r / min,

[0071] The unit of Nc is r / s.

[0072] In Step 1, in the time period from 0 to t1, the rotation speed of the driving roller 2 gradually increases from 0 to Nc; in the time period from t1 to t2, the driving roller 2 rotates at a constant speed, and the rotation speed of the driving roller 2 is Nc; in the time period from t2 to t3, the rotation speed of the driving roller 2 gradually decreases from Nc to 0; where t1 is the time point when the output frequency of the frequency converter of the driving roller motor 1 reaches f_set; t2 is the time point when the output frequency of the frequency converter of the driving roller motor 1 starts to decrease; t3 is the time point when the output frequency of the frequency converter of the driving roller motor 1 decreases to 0.

[0073] As Figure 2 shown, in the time period from 0 to t1, the rotation speed of the driving roller 2 continuously increases from 0, and when the time reaches the time point t1, the rotation speed of the driving roller 2 increases to Nc; t1 is the time point when the output frequency of the frequency converter of the driving roller motor 1 reaches f_set and is a fixed value; in the time period from t2 to t3, the rotation speed of the driving roller 2 continuously decreases, and when the time reaches the time point t3, the rotation speed of the driving roller 2 is 0; the time interval from t2 to t3 is a fixed value; in the time period from t1 to t2, the driving roller 2 rotates at a constant speed, and the rotation speed is Nc.

[0074] Step 1 further includes:

[0075] Step 12: Calculate the number of turns that the driving roller 2 rotates in the time period from 0 to t1, that is:

[0076]

[0077] where S01 is the number of turns that the driving roller 2 rotates in the time period from 0 to t1;

[0078] Calculate the number of turns that the driving roller 2 rotates in the time period from t2 to t3, that is:

[0079]

[0080] where S23 is the number of turns that the driving roller 2 rotates in the time period from t2 to t3; t23 = t3 - t2, and t23 is the duration of the decrease in the output frequency of the frequency converter of the driving roller motor 1 from f_set to 0;

[0081] Calculate the total number of turns S1 that the driving roller 2 rotates in the time periods from 0 to t1 and from t2 to t3, that is:

[0082] S1 = S01 + S23.

[0083] In the time period from 0 to t1, the drive roller 2 is in the acceleration process. By integrating the speed with respect to time, the number of revolutions S01 (unit: revolution) of the drive roller during this period can be calculated. In the time period from t2 to t3, the drive roller 2 is in the deceleration process. By integrating the speed with respect to time, the number of revolutions S23 (unit: revolution) of the drive roller 2 during this period can be calculated. t23 is the duration when the output frequency of the frequency converter of the drive roller motor 1 drops from f_set to 0, and t23 is a fixed value. The unit of t23 is s. By adding the number of revolutions of the drive roller 2 during the acceleration and deceleration times, S1 (unit: revolution) can be obtained.

[0084] Step 1 further includes:

[0085] Step 13: Measure the circumference of the drive roller 2 and calculate the total displacement of the drive roller 2 during the time period from 0 to t1 and from t2 to t3, that is:

[0086] S11 = C1 × S1;

[0087] Where C1 is the circumference of the drive roller 2; S11 is the total actual displacement of the drive roller 2 during the time period from 0 to t1 and from t2 to t3.

[0088] The staff manually measures the circumference C1 of the drive roller 2 with a tape measure; based on the circumference C1 of the drive roller 2, the displacement S11 (unit: mm) of the drive roller 2 during the acceleration and deceleration stages can be calculated.

[0089] Step 2 includes:

[0090] Step 21: Calculate the circumference of the steel coil 3, that is:

[0091] C = 2Π × R;

[0092] Where C is the circumference of the steel coil 3; R is the radius of the steel coil 3.

[0093] R is the radius of the steel coil 3 (unit: mm), C is the circumference of the steel coil (unit: mm); π is the pi, with a value of 3.141593.

[0094] Step 2 further includes:

[0095] Step 22: The total actual displacement of the drive roller 2 is equal to the rotational displacement of the steel coil 3; calculate the length of the steel coil 3 without wrapping anti-rust paper, that is:

[0096] L = C - S11;

[0097] Where L is the length of the steel coil 3 without wrapping anti-rust paper.

[0098] The drive roller 2 and the steel coil 3 run tangentially, so the displacement of the drive roller 2 during rotation is equal to that of the steel coil 3 during rotation. Subtracting the displacement of the steel coil 3 during rotation from the circumference of the steel coil 3 gives the length L of the steel coil 3 without the rust-proof paper wrapped around it; the unit of L is mm.

[0099] Step 3 includes:

[0100] Step 31: Calculate the time taken for the drive roller 2 to rotate a length of L during the time period t1 - t2, i.e.:

[0101]

[0102] where t12 is the time taken for the drive roller 2 to rotate a length of L.

[0103] As Figure 2 shown: During the time period t1 - t2, the drive roller 2 rotates at a constant speed, so the time taken for the drive roller 2 to complete the displacement of L is t12 (unit: s).

[0104] Step 3 also includes:

[0105] Step 32: Calculate the total time from when the drive roller motor 1 starts to when the rust-proof paper is positioned, i.e.:

[0106] T = (t1 + t12 + t23) × kt,

[0107] where T is the total time from when the drive roller motor 1 starts to when the rust-proof paper is positioned; kt is the time compensation coefficient obtained from human experiments.

[0108] The wear of the rubber roller will cause a decrease in the frictional force with the steel coil 3 and also a slight decrease in the diameter of the rubber roller, which will lead to calculation errors. Therefore, the compensation coefficient kt is set to correct the deviations caused by the on-site equipment environment and improve the accuracy of the formula calculation to achieve the purpose of accurate control.

[0109] Step 3 also includes:

[0110] Step 33: Calculate kt, i.e.:

[0111]

[0112] cum is the cumulative material consumption value of n coils calculated based on the radius of the steel coil 3 after packaging n coils; L3_cum is the actual cumulative material consumption value.

[0113] Due to the changes in on-site equipment under different environments, kt will not always remain constant. Therefore, an algorithm formula for automatically calibrating kt is designed. When it is first put into use, n can be set to 1, and the compensation coefficient will automatically become 1.0 (representing no compensation). Then, set the "number of rolls for automatic calibration" according to the actual situation to achieve the automatic calibration of the compensation coefficient kt and the automatic dynamic correction of the positioning control, ultimately achieving the purpose of precise positioning.

[0114] After the drive roller motor 1 starts, it automatically stops after T seconds, and the anti-rust paper is positioned as the steel coil 3 rotates.

[0115] The specific working process of the present invention is as follows:

[0116] Step 1: When the output frequency of the frequency converter of the drive roller motor 1 reaches the set output frequency value, calculate the total displacement actually rotated by the drive roller 2 during the acceleration period and the deceleration period.

[0117] Step 2: Calculate the length of the steel coil 3 without the anti-rust paper based on the total displacement actually rotated by the drive roller 2.

[0118] Step 3: Calculate the total time T from the start of the drive roller motor 1 to the completion of the anti-rust paper positioning based on the length of the steel coil 3 without the anti-rust paper. After the drive roller motor 1 starts, it automatically stops after T seconds, and the anti-rust paper rotates with the steel coil 3 to complete the positioning.

[0119] As an embodiment, as Figure 1 shown, a wrapping machine capable of applying the rotation positioning method of the drive roller of the wrapping machine includes a drive roller motor 1. The drive roller motor 1 is connected to a frequency converter and a speed reducer 4. The speed reducer 4 is connected to the drive roller 2. A driven roller 201 is provided on one side of the drive roller 2. The steel coil 3 is arranged on the drive roller 2 and the driven roller 201. An anti-rust paper pasting line 301 is provided on the steel coil 3, and the initial end of the anti-rust paper is pasted on the anti-rust paper pasting line 301. The frequency converter can adjust the rotation speed of the drive roller motor 1. The power generated by the operation of the drive roller motor 1 is transmitted to the speed reducer 4. The gear mechanism in the speed reducer 4 reduces the speed and increases the torque according to the transmission ratio, converting the high-speed low-torque output by the drive roller motor 1 into the low-speed high-torque suitable for the operation of the drive roller 2. The power output by the speed reducer 4 drives the drive roller 2 to rotate. The rotation of the drive roller 2 drives the steel coil 3 to rotate, thereby enabling the winding operation of the anti-rust paper on the steel coil 3.

[0120] According to the rotation positioning method of the drive roller of the wrapping machine of the present invention, a PLC program can be written to achieve the control of the wrapping machine; as Figure 3As shown, the HMI (Human-Machine Interface) screen can be compiled. Through the HMI screen, parameters can be manually input: the rated speed n of the drive roller motor 1, the reduction ratio i of the reduction gearbox 4, the set value f_set of the output frequency of the frequency converter of the drive roller motor 1, the duration t1 for the output frequency of the frequency converter of the drive roller motor 1 to reach f_set, the falling duration t23 for the output frequency of the frequency converter of the drive roller motor 1 to drop from f_set to 0, the circumference C1 of the drive roller 2, the time compensation coefficient kt obtained from manual experiments, and the number of rolls between automatic calibrations; when first put into use, the "number of rolls between automatic calibrations" on the HMI screen can be set to 1, and at this time the compensation coefficient will automatically become 1.0 (representing no compensation), and then the "number of rolls between automatic calibrations" can be set according to the actual situation to achieve the automatic calibration of the compensation coefficient kt, realize the automatic dynamic correction of the positioning control, and finally achieve the purpose of precise positioning.

[0121] The present invention has been described exemplarily in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above methods. As long as various non-substantive improvements are made by adopting the method concept and technical solution of the present invention; or without improvement, the above concept and technical solution of the present invention are directly applied to other occasions, they are all within the protection scope of the present invention.

Claims

1. A method for rotating and positioning a driving roller of a rolling and wrapping machine, characterized in that: It includes the following steps: Step 1: Calculate the total displacement actually rotated by the driving roller (2) during the acceleration period and the deceleration period; Step 2: Calculate the length of the steel coil (3) without anti-rust paper wrapped according to the total displacement actually rotated by the driving roller (2); Step 3: Calculate the total time T from the start of the driving roller motor (1) to the completion of the positioning of the anti-rust paper according to the length of the steel coil (3) without anti-rust paper wrapped. The driving roller motor (1) automatically stops after T seconds of starting, and the anti-rust paper rotates with the steel coil (3) to complete the positioning.

2. A method for rotating and positioning a driving roller of a rolling wrapper according to claim 1, characterized in that: The said Step 1 includes: Step 11: Calculate the rotational speed of the driving roller (2) when the output frequency of the frequency converter of the driving roller motor (1) reaches the frequency set value, that is: Wherein, n is the rated rotational speed of the driving roller motor (1); i is the reduction ratio of the reduction gearbox (4); f_set is the output frequency set value of the frequency converter of the driving roller motor (1); f_max is the maximum output frequency of the frequency converter of the driving roller motor (1); Nc is the rotational speed of the driving roller (2) when the output frequency of the frequency converter of the driving roller motor (1) reaches f_set.

3. A method for rotating and positioning a transmission roller of a rolling machine according to claim 2, characterized in that: In the said Step 1, in the time period of 0 - t1, the rotational speed of the driving roller (2) gradually increases from 0 to Nc; in the time period of t1 - t2, the driving roller (2) maintains a constant speed, and the rotational speed of the driving roller (2) is Nc; in the time period of t2 - t3, the rotational speed of the driving roller (2) gradually decreases from Nc to 0; where t1 is the time point when the output frequency of the frequency converter of the driving roller motor (1) reaches f_set; t2 is the time point when the output frequency of the frequency converter of the driving roller motor (1) starts to decrease from f_set; t3 is the time point when the output frequency of the frequency converter of the driving roller motor (1) decreases to 0.

4. A method for rotating and positioning a transmission roller of a rolling machine according to claim 3, characterized in that: The said Step 1 further includes: Step 12: Calculate the number of turns rotated by the driving roller (2) in the time period of 0 - t1, that is: Where S01 is the number of turns rotated by the driving roller (2) in the time period of 0 - t1; Calculate the number of turns rotated by the driving roller (2) in the time period of t2 - t3, that is: Where S23 is the number of turns rotated by the driving roller (2) in the time period of t2 - t3; t23 = t3 - t2, and t23 is the falling time when the output frequency of the frequency converter of the driving roller motor (1) drops from f_set to 0; Calculate the total number of turns S1 rotated by the driving roller (2) in the time periods of 0 - t1 and t2 - t3, that is: S1 = S01 + S23.

5. A method for rotating and positioning a driving roller of a rolling wrapper according to claim 4, characterized in that: The said Step 1 further includes: Step 13: Measure the circumference of the driving roller (2), and calculate the total displacement rotated by the driving roller (2) in the time periods of 0 - t1 and t2 - t3, that is: S11 = C1×S1; Where C1 is the circumference of the driving roller (2); S11 is the total displacement actually rotated by the driving roller (2) in the time periods of 0 - t1 and t2 - t3.

6. A method for rotating and positioning the drive roller of a rolling and wrapping machine according to claim 5, characterized in that: The said Step 2 includes: Step 21: Calculate the circumference of the steel coil (3), that is: C = 2Π×R; Where C is the circumference of the steel coil (3); R is the radius of the steel coil (3).

7. A method for rotating and positioning a transmission roller of a rolling wrapper according to claim 6, characterized in that: The said Step 2 further includes: Step 22: The total displacement of the actual rotation of the driving roller (2) is equal to the rotational displacement of the steel coil (3); calculate the length of the steel coil (3) without the anti-rust paper wrapped, that is: L = C - S11; where L is the length of the steel coil (3) without the anti-rust paper wrapped.

8. A method for rotating and positioning a transmission roller of a rolling wrapper according to claim 7, characterized in that: The said Step 3 includes: Step 31: Calculate the time taken for the driving roller (2) to rotate a length of L during the time period from t1 to t2, that is: where t12 is the time taken for the driving roller (2) to rotate a length of L.

9. A method for rotating and positioning a transmission roller of a rolling wrapper according to claim 8, characterized in that: The said Step 3 further includes: Step 32: Calculate the total time from the start of the driving roller motor (1) to the completion of the anti-rust paper positioning, that is: T = (t1 + t12 + t23) × kt, where T is the total time from the start of the driving roller motor (1) to the completion of the anti-rust paper positioning; kt is the time compensation coefficient obtained from human experiments.

10. A method for positioning the rotation of the driving roller of a rolling wrapper according to claim 9, characterized in that: The said Step 3 further includes: Step 33: Calculate kt, that is: The cum is the cumulative material consumption value of n rolls calculated according to the radius of the steel coil (3) after packaging n rolls; L3_cum is the actual cumulative material consumption value.

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