Method and system for calculating real-time rolling diameter and residual length of coiled material

Abstract

The embodiment of the invention discloses a real-time coil diameter and coil remaining length calculation method and system. The embodiment of the invention is suitable for the control field of winding and unwinding equipment such as a winding machine and a splitting machine. The method comprises the following steps of: acquiring a coiled material thickness parameter and an initial coiling diameter, acquiring the uncoiling length in real time after coiling is started, and dynamically calculating the real-time coiling diameter based on a volume conservation principle, and is characterized in that a real-time coiling diameter value which is strictly and monotonically decreased is iteratively output by utilizing a geometrical relationship among the initial coiling diameter, the thickness and the uncoiling length, and the residual length is calculated according to the real-time coiling diameter value. When the real-time rolling diameter is smaller than or equal to the diameter of the charging barrel, the remaining length is judged to be zero, meanwhile, non-material pre-judgment shutdown is achieved through a preset threshold value, and the risk of pressing piece belt breakage caused by traditional tension sudden change detection is avoided. A dynamic calibration mechanism is additionally arranged for the coiled material with the uneven thickness, and the average thickness updating parameter is reversely deduced by periodically measuring the actual coiling diameter.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of winding machines, in particular to a method and system for calculating real-time winding diameter and remaining length of winding material. BACKGROUND

[0002] In the process of running the equipment in the field of winding machines, unwinding and winding, it is very important to obtain the winding diameter of the material on the unwinding shaft and the remaining length of the winding material in real time and accurately, so as to ensure the stable operation of the equipment, improve the production efficiency and product quality.

[0003] At present, the commonly used winding diameter calculation in the industry is to obtain the winding diameter through a laser range finder. This scheme needs to additionally equip with a sensor, which not only increases the procurement cost of the equipment, but also has certain complexity in installation and maintenance. In some harsh production environments, the sensor may also be disturbed.

[0004] Another method is to record a length and the corresponding angle of rotation of the unwinding shaft, and obtain the winding diameter by calculating the difference between the length and the corresponding angle. This method not only has a certain hysteresis in the calculation result, but also the calculated winding diameter is a static average value, which cannot meet the real-time requirement. In addition, this method may also have calculation errors, resulting in a winding diameter larger than that of the previous battery cell, which is contrary to the physical law that the winding diameter gradually decreases during unwinding. If the winding diameter abnormally increases, the angular velocity will decrease, resulting in speed mismatch and further exacerbating tension fluctuation. SUMMARY

[0005] Therefore, embodiments of the present application provide a method and system for calculating real-time winding diameter and remaining length of winding material to solve the technical problem of direction error and hysteresis in the winding diameter calculation without using a sensor for measurement in the prior art.

[0006] To achieve the above object, embodiments of the present application provide the following technical solutions:

[0007] According to a first aspect of embodiments of the present application, a method for calculating real-time winding diameter and remaining length of winding material is provided, the method comprising:

[0008] obtaining a thickness parameter of the winding material and an initial diameter of the material on the unwinding shaft;

[0009] starting the winding process, clearing the encoder, and recording the unwinding length of the winding material in real time;

[0010] dynamically calculating the real-time winding diameter at the current time according to the initial diameter, the thickness parameter and the real-time unwinding length, wherein the real-time winding diameter monotonically decreases with the increase of the unwinding length;

[0011] updating the calculated real-time roll diameter as an initial diameter for a subsequent calculation period;

[0012] calculating a remaining length of the roll material according to the real-time roll diameter and the barrel diameter, wherein the remaining length is zero when the real-time roll diameter is less than or equal to the barrel diameter.

[0013] Further, dynamically calculating a real-time roll diameter at a current time according to the initial diameter, the thickness parameter and the real-time unwinding length, comprising:

[0014] The calculation method of the real-time roll diameter is:

[0015]

[0016] wherein D0 is the initial diameter, D1 is the real-time diameter, t is the roll material thickness, and L is the unwinding length, all in mm.

[0017] Further, calculating a remaining length of the roll material according to the real-time roll diameter and the barrel diameter, comprising:

[0018] The calculation expression of the remaining length is:

[0019]

[0020] wherein L1 is the remaining length, D1 is the real-time diameter, D 筒 is the barrel diameter, and t is the roll material thickness, wherein L1 = 0 when the real-time roll diameter is less than the barrel diameter, all in mm.

[0021] Further, the method further comprises:

[0022] When the unwinding material thickness is uneven, sampling the thickness of the roll material:

[0023] After continuous winding to a predetermined length, recording the distance accumulated by the encoder at this time, and measuring the actual diameter of the roll at this time;

[0024] According to the initial diameter, the actual diameter and the accumulated running distance, inversely calculating the average thickness of the roll material;

[0025] Using the calculated average thickness to update the thickness parameter, and using the updated thickness parameter for subsequent roll diameter calculation.

[0026] Further, according to the initial diameter, the actual diameter and the accumulated running distance, inversely calculating the average thickness of the roll material, comprising:

[0027] The calculation expression of the average thickness is:

[0028]

[0029] Wherein, L is actual running distance, D0 is initial diameter, D1 is actual diameter, units are mm.

[0030] Further, the method further comprises:

[0031] When the calculated remaining length is lower than a preset threshold, triggering a device shutdown instruction.

[0032] According to a second aspect of the embodiments of the present application, a real-time roll diameter and roll material remaining length calculation system is provided, the system comprising:

[0033] A parameter input module is configured to obtain a thickness parameter of the roll material and an initial diameter of the material roll on the unwinding shaft;

[0034] An encoder processing module is configured to start the winding process, perform a zero operation on the encoder, and record the unwinding length of the roll material in real time;

[0035] A roll diameter calculation module is configured to dynamically calculate a real-time roll diameter at the current time according to the initial diameter, the thickness parameter, and the real-time unwinding length, wherein the real-time roll diameter monotonically decreases with the increase of the unwinding length;

[0036] A parameter updating module is configured to update the calculated real-time roll diameter as the initial diameter of the subsequent calculation period;

[0037] A remaining length calculation module is configured to calculate the remaining length of the roll material according to the real-time roll diameter and the barrel diameter, wherein when the real-time roll diameter is less than or equal to the barrel diameter, the remaining length at this time is zero.

[0038] Further, a thickness self-adapting module is further included, configured to perform the following steps:

[0039] When the unwinding material thickness is uneven, sampling the thickness of the roll material:

[0040] After continuous winding reaches a predetermined length, recording the distance accumulated by the encoder at this time, and measuring the actual diameter of the roll at this time;

[0041] According to the initial diameter, the actual diameter, and the accumulated running distance, the average thickness of the roll material is calculated by back calculation;

[0042] The calculated average thickness is used to update the thickness parameter, and the updated thickness parameter is used for subsequent roll diameter calculation.

[0043] The embodiments of the present application have the following advantages:

[0044] The embodiment of the present application is suitable for the control field of winding and unwinding equipment such as winding machines, slitting machines and the like. The method acquires the thickness parameter and the initial roll diameter of the roll material, collects the unwinding length in real time after the winding starts, and dynamically calculates the real-time roll diameter based on the volume conservation principle. The core is to use the geometric relationship of the initial roll diameter, thickness and unwinding length to iteratively output the strictly monotonically decreasing real-time roll diameter value, and calculate the remaining length accordingly. When the real-time roll diameter is less than or equal to the diameter of the material cylinder, the remaining length is determined to be zero, and the preset threshold is used to realize the no-material pre-judgment stop, thereby avoiding the risk of sheet pressing and belt breaking caused by the traditional sudden tension change detection. A dynamic calibration mechanism is added for the uneven thickness roll material, and the average thickness is updated by periodically measuring the actual roll diameter. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other drawings can be obtained from the provided drawings without creative labor.

[0046] The structures, proportions, sizes and the like shown in the specification are only used to cooperate with the content disclosed in the specification, to be understood and read by those skilled in the art, and are not used to limit the limiting conditions of the embodiments of the present application, so they do not have technical significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effect and purpose that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application.

[0047] Figure 1 A logical structure schematic diagram of a real-time roll diameter and roll material remaining length calculation system provided by the embodiment of the present application;

[0048] Figure 2 A flowchart schematic diagram of a real-time roll diameter and roll material remaining length calculation method provided by the embodiment of the present application;

[0049] Figure 3 A thickness self-adaptive flowchart schematic diagram in a real-time roll diameter and roll material remaining length calculation method provided by the embodiment of the present application;

[0050] Figure 4 A monitoring schematic diagram of unwinding length and unwinding real-time roll diameter in a real-time roll diameter and roll material remaining length calculation method provided by the embodiment of the present application;

[0051] Figure 5 A diameter and L relationship curve schematic diagram in a real-time roll diameter and roll material remaining length calculation method provided by the embodiment of the present application;

[0052] Figure 6 A schematic diagram of the relationship between the real-time roll diameter D1 and the used length L in the real-time roll diameter and the calculation method of the remaining length of the roll material provided for an embodiment of the present application;

[0053] Figure 7 A schematic diagram of the relationship between the real-time roll diameter D1 and the used length, the real-time roll diameter D1 and the remaining length in the real-time roll diameter and the calculation method of the remaining length of the roll material provided for another embodiment of the present application. DETAILED DESCRIPTION

[0054] The embodiments of the present application are described below by specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification. Obviously, the described embodiments are part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0055] The speed synchronous control mode is adopted for the unwinding shaft of the current winding machine and other winding and unwinding equipment, and the speed unit is angular velocity, while the encoder feedback is linear velocity, so the conversion from linear velocity to angular velocity needs to be completed in the speed following process. The accuracy of the speed unit conversion depends on the roll diameter, especially when the equipment runs at high speed. If there is a large error between the calculated value and the actual value of the real-time roll diameter, the unwinding shaft speed and the actual running speed of the roll material will not match, which will cause the material to shake when unwinding at high speed, and also cause the tension to fluctuate.

[0056] The current roll diameter calculation method in the industry is:

[0057] 1. Through the laser range finder, this scheme needs additional hardware support, and the cost is high;

[0058] 2. Record a length and the angle of the unwinding shaft rotation, calculate the length difference and the angle difference corresponding to the data obtained during winding. When the corresponding length is small, the calculation result error is large, and when the corresponding length is large, the calculated result also has a certain hysteresis (is the average value of the piece). The calculation result of the present application is dynamic, and the real-time dynamic roll diameter is calculated according to the real-time unwinding length.

[0059] The most commonly used no-material detection method in the industry still uses a no-material sensor to detect the roll material. In order to reduce the cost, small factories use tension changes to stop the equipment when the tension disappears (no material), and at the same time, the material is pressed into a piece. Although it can effectively and timely stop, pressing the piece will inevitably cause the piece to break, which is not conducive to roll replacement and tape connection. The remaining roll length calculated by the calculation method of the present application can be used to predict the roll in advance to stop in advance.

[0060] At this time, a method for calculating the winding diameter and the remaining length of the winding material in real time, accurately and stably without an additional sensor is needed to solve the problems of error, hysteresis and inconvenience of material detection in the prior art.

[0061] In order to solve the technical problems of direction error and hysteresis in the winding diameter calculation without using a sensor for measurement.

[0062] Reference Figure 1 The embodiment of the present application discloses a system for calculating the winding diameter and the remaining length of the winding material in real time, which comprises: a parameter input module 1; an encoder processing module 2; a winding diameter calculation module 3; a parameter updating module 4; a remaining length calculation module 5; and a thickness adaptive module 6.

[0063] Corresponding to the above-mentioned system for calculating the winding diameter and the remaining length of the winding material in real time, the embodiment of the present application further discloses a method for calculating the winding diameter and the remaining length of the winding material in real time. The method for calculating the winding diameter and the remaining length of the winding material in real time disclosed in the embodiment of the present application is described in detail below in combination with the above-mentioned system for calculating the winding diameter and the remaining length of the winding material in real time.

[0064] According to the initial diameter of the unwinding material and the thickness of the unwinding material, and the real-time length of the encoder during the unwinding process, the material winding diameter value of the winding machine is determined

[0065] Step 1: obtaining the thickness parameter t of the winding material and the initial diameter D0 of the winding material of the unwinding shaft to the PLC controller;

[0066] Step 2: encoder zero, winding start;

[0067] Step 3: according to the recorded distance L of the encoder movement and the initial diameter D0 of the winding material at the winding start, the real-time winding diameter D1 is calculated in real time by the controller, and the calculation method is Wherein D0 is the initial diameter, D1 is the real-time diameter, t is the thickness of the winding material, and L is the unwinding length, all in mm;

[0068] Step 4: after the calculation is completed, the real-time diameter D1 after winding is output and written to the initial winding diameter D0 as the initial diameter for the next winding;

[0069] Step 5: further, according to the calculated real-time winding diameter D1, the remaining length L1 of the winding material is calculated, and the calculation formula is (When the real-time winding diameter is less than the barrel diameter, L1=0), all in mm.

[0070] Reference Figure 2The present invention discloses a method for calculating the real-time coil diameter and the remaining length of a coil, the method comprising: obtaining the thickness parameter of the coil and the initial diameter of the coil on the unwinding shaft; starting the winding process, clearing the encoder, and recording the unwinding length of the coil in real time; dynamically calculating the real-time coil diameter at the current moment according to the initial diameter, the thickness parameter, and the real-time unwinding length, wherein the real-time coil diameter decreases monotonically with the increase of the unwinding length; updating the calculated real-time coil diameter to the initial diameter of the subsequent calculation cycle; calculating the remaining length of the coil according to the real-time coil diameter and the barrel diameter, wherein when the real-time coil diameter is less than or equal to the barrel diameter, the remaining length at this time is zero.

[0071] Furthermore, dynamically calculating the real-time coil diameter at the current moment according to the initial diameter, the thickness parameter and the real-time unwinding length includes:

[0072] The calculation method of real-time coil diameter is:

[0073]

[0074] Where D0 is the initial diameter, D1 is the real-time diameter, t is the coil thickness, and L is the unwinding length, all in mm.

[0075] Furthermore, the remaining length of the coil is calculated based on the real-time coil diameter and the barrel diameter, including:

[0076] The calculation expression of the remaining length is:

[0077]

[0078] Among them, L1 is the remaining length, D1 is the actual diameter, and D 筒 is the barrel diameter, t is the coil thickness, when the real coil diameter is smaller than the barrel diameter, L1=0, both in mm.

[0079] The derivation of the real-time coil diameter is based on the following principle: during the winding process, the volume of the unwinding material is equal to the volume of the wound material (volume conservation principle). Assuming the initial coil diameter is D0, the unwinding length is L, and the material thickness is t, the real-time coil diameter after unwinding is D1;

[0080] Cross-sectional area of ​​the initial wound material (circular area): (The initial diameter D0 includes the barrel diameter);

[0081] Cross-sectional area of ​​remaining material after unwinding:

[0082] The volume of the unwound material = the cross-sectional area difference × the material width (assuming the width is w), that is: (S0-S1)*w;

[0083] The volume of the wound material = unwinding length x width x thickness, i.e. L x w x t;

[0084] According to the volume conservation Approximately w can be obtained

[0085] Further, with reference to Figure 3 , the method further comprises: when the unwinding material thickness is uneven, sampling the thickness of the winding material; after continuous winding reaches a predetermined length, recording the distance accumulated by the encoder at this time, measuring the actual diameter of the roll at this time; according to the initial diameter, the actual diameter and the accumulated running distance, the average thickness of the winding material is calculated by back calculation; the average thickness calculated is used to update the thickness parameter, and the updated thickness parameter is used for subsequent roll diameter calculation.

[0086] For the case where the unwinding material thickness is uneven, the thickness of the winding material can be sampled, and the specific steps are:

[0087] Step a: pre-measurement, manually input the thickness parameter t of the diaphragm or winding material and the roll diameter D0 to the PLC controller;

[0088] Step b: encoder zero, winding start;

[0089] Step c: after winding a certain number of batteries, record the distance L1 accumulated by the encoder and manually measure the actual roll diameter D1 after winding is completed;

[0090] Step d: calculate the thickness t of the material, the calculation formula is The units are all mm;

[0091] Step e: update the parameter as a new thickness parameter for subsequent roll diameter calculation.

[0092] Further, according to the initial diameter, the actual diameter and the accumulated running distance, the average thickness of the winding material is calculated by back calculation, which comprises:

[0093] The calculation expression of the average thickness is:

[0094]

[0095] Wherein, L is the actual running distance, D0 is the initial diameter, D1 is the actual diameter, and the units are all mm.

[0096] Further, the method further comprises:

[0097] When the calculated remaining length is lower than a preset threshold, a device shutdown instruction is triggered.

[0098] Taking the winding machine as an example, the length L of each electrode unwound by a battery cell is 800mm, the thickness is 0.145mm, and the initial coil diameter is 200mm. Then, after winding a electrode, the real-time coil diameter of the coil is

[0099] The calculated winding diameter is used as the initial diameter of the next sheet. After winding another battery cell, the diameter D1 = 199.26 mm, and ΔD is 0.38 mm.

[0100] When the winding diameter is reduced to 100 mm, the diameter of one battery cell is D1 = 99.25 mm, and the diameter after winding two battery cells is 98.515 mm, and ΔD is 0.75 mm.

[0101] Figure 4 This is a monitoring diagram of the initial roll diameter of 200mm, the unwinding length and the real-time roll diameter. The real-time roll diameter decreases as the unwinding length increases.

[0102] The calculated roll diameter is used as the initial diameter of the next sheet. After winding one more cell, the diameter D1 = 199.26mm, and the ΔD is 0.38mm. When the roll diameter is reduced to 100mm, the diameter D1 of the wound cell is 99.25mm, and after winding two cells, the diameter is 98.515mm, and the ΔD is 0.75mm.

[0103] Attachment Figure 5 The curve of the relationship between diameter and L (D0 = 200.0 mm, t = 0.145 mm) shows the nonlinear characteristics of a power function, such as a monotonically decreasing parabola. The slope is small when the diameter is large, and the slope is large when the diameter is small.

[0104] Attachment Figure 6 is the relationship between the real-time coil diameter D1 and the used length L (D0 = 200.0 mm, Dmin = 85.0 mm, t = 0.145 mm). As the used length L increases, the real-time coil diameter D1 gradually decreases.

[0105] As well as the relationship between the remaining length L1 and the real-time coil diameter D1, the remaining length L1 decreases linearly with the decrease of the real-time coil diameter D1, and the real-time coil diameter coordinate axis is 200mm to 85mm from left to right;

[0106] Curve change trend analysis:

[0107] When D0 is larger, D0 2 It's also relatively large. The remaining value is also larger, and the value of D1 is also larger. When D0 is smaller, D0 2 It's also relatively small. The remaining value is also relatively small, and the value of D1 is also small.

[0108] Analysis of decreasing amount D1-D0:

[0109] When D0 is large, although D1 is also large, because the base of D0 2 is large, after subtracting the same , the proportion of the reduction of D1 to D0 is small;

[0110] When D0 is small, the proportion of the reduction of D1 to D0 is large, because the base of D0 2 is small, after subtracting the same , the proportion of the reduction of D1 to D0 is large.

[0111] The embodiment of the present application has the following beneficial effects:

[0112] 1) The method for calculating the diameter of the roll does not have calculation errors, and the diameter of the roll is larger than the previous cell (if the diameter of the roll increases, the converted angular velocity will decrease, thereby causing speed mismatching and affecting tension fluctuation), while the calculated diameter of the roll is unidirectionally decreasing, which conforms to the physical process law of unwinding and avoids unreasonable situations of abnormal increase of the diameter of the roll;

[0113] 2) The traditional calculation of the length and the rotation angle needs to obtain the corresponding length difference and the corresponding angle difference during the winding process, and when the obtained corresponding length is small, the error range will be increased, and when the obtained length is large, there is a certain lag in calculation, and the calculated diameter of the roll is a static value, while the present application calculates the real-time dynamic diameter of the roll according to the real-time unwinding length;

[0114] 3) The method for calculating the diameter of the roll is essentially a geometric relationship derived from the volume parameter of the cylinder, which does not require additional sensors, reduces the cost of equipment procurement and installation, and only relies on the encoder of the standard roll equipment to achieve the calculation. The advantage is low cost and strong anti-interference, and the precision can meet the industrial demand in the scene of uniform material thickness and stable winding (such as cylindrical winding machine, film winding, paper cutting, etc.).

[0115] Although the present application has been described in detail above with general description and specific embodiments, some modifications or improvements can be made on the basis of the present application, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the present application are within the scope of the present application.

Claims

1. A method for calculating the real-time coil diameter and the remaining length of the coil, characterized in that: The method comprises: Obtain the thickness parameters of the coil and the initial diameter of the coil on the unwinding shaft; Starting the winding process, performing a zeroing operation on the encoder, and recording the unwinding length of the coil in real time; Dynamically calculating the real-time coil diameter at the current moment according to the initial diameter, the thickness parameter, and the real-time unwinding length, wherein the real-time coil diameter decreases monotonically with the increase of the unwinding length; Updating the calculated real-time coil diameter as the initial diameter of a subsequent calculation cycle; The remaining length of the coil is calculated based on the real-time coil diameter and the barrel diameter, wherein when the real-time coil diameter is less than or equal to the barrel diameter, the remaining length is zero.

2. A method for calculating the real-time coil diameter and the remaining length of the coil according to claim 1, characterized in that: Dynamically calculating the real-time coil diameter at the current moment according to the initial diameter, the thickness parameter, and the real-time unwinding length includes: The calculation method of real-time coil diameter is: Where D0 is the initial diameter, D1 is the real-time diameter, t is the coil thickness, and L is the unwinding length, all in mm.

3. A method for calculating the real-time coil diameter and the remaining length of the coil according to claim 2, characterized in that: Calculating the remaining length of the coil according to the real-time coil diameter and the barrel diameter, including: The calculation expression of the remaining length is: Among them, L1 is the remaining length, D1 is the actual diameter, and D 筒 is the barrel diameter, t is the coil thickness, when the real coil diameter is smaller than the barrel diameter, L1=0, both in mm.

4. The method for calculating the real-time coil diameter and the remaining length of the coil according to claim 1, wherein: The method further comprises: When the thickness of the unwinding material is uneven, sample the thickness of the coil: After the continuous winding reaches the predetermined length, the encoder records the cumulative running distance at this time and measures the actual diameter of the roll at this time; Reversely calculating the average thickness of the coil according to the initial diameter, the actual diameter, and the accumulated running distance; The calculated average thickness is used to update the thickness parameter, and the updated thickness parameter is used for subsequent coil diameter calculation.

5. The method for calculating the real-time coil diameter and the remaining length of the coil according to claim 4, characterized in that: The average thickness of the coil is calculated based on the initial diameter, the actual diameter, and the accumulated running distance, including: The calculation expression of the average thickness is: Wherein, L is the actual running distance, D0 is the initial diameter, and D1 is the actual diameter, all in mm.

6. A method for calculating the real-time coil diameter and the remaining length of the coil according to claim 5, characterized in that: The method further comprises: When the calculated remaining length is lower than a preset threshold, a device shutdown instruction is triggered.

7. A system for calculating the real-time coil diameter and the remaining length of the coil, characterized in that: The system comprises: Parameter input module, used to obtain the thickness parameters of the coil and the initial diameter of the coil on the unwinding shaft; An encoder processing module is used to start the winding process, perform a zeroing operation on the encoder, and record the unwinding length of the coil in real time; a coil diameter calculation module, configured to dynamically calculate the current real-time coil diameter based on the initial diameter, the thickness parameter, and the real-time unwinding length, wherein the real-time coil diameter decreases monotonically with increasing unwinding length; A parameter updating module, configured to update the calculated real-time coil diameter to an initial diameter for a subsequent calculation cycle; The remaining length calculation module is used to calculate the remaining length of the coil according to the real-time coil diameter and the barrel diameter, wherein when the real-time coil diameter is less than or equal to the barrel diameter, the remaining length at this time is zero.

8. The system for calculating the real-time coil diameter and the remaining length of the coil according to claim 7, characterized in that: A thickness adaptation module is also included to perform the following steps: When the thickness of the unwinding material is uneven, sample the thickness of the coil: After the continuous winding reaches the predetermined length, the encoder records the cumulative running distance at this time and measures the actual diameter of the roll at this time; Reversely calculating the average thickness of the coil according to the initial diameter, the actual diameter, and the accumulated running distance; The calculated average thickness is used to update the thickness parameter, and the updated thickness parameter is used for subsequent coil diameter calculation.

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