Feeding method for non-woven fabric hole cutting and feeding mechanism thereof

Abstract

The invention relates to the technical field of non-woven fabric feeding, in particular to a feeding method for non-woven fabric hole cutting and a feeding mechanism of the non-woven fabric hole cutting. The guide roller number, the guide roller wrap angle, the path length, the rolling diameter, the detection tension sequence, the preset tension, the detection linear speed and the preset traction speed corresponding to each unwinding mechanism included in the feeding mechanism are obtained; determining a linear speed deviation coefficient, a dynamic resistance interval and a torque adjusting range corresponding to each unwinding mechanism; determining a target torque combination based on the torque adjusting ranges corresponding to all the unwinding mechanisms included in the feeding mechanism; and according to the target torque combination, the torque of each unwinding mechanism in the current feeding period is adjusted. According to the invention, the torques of different unwinding mechanisms are adjusted in a self-adaptive manner, so that the cooperative operation of the multiple unwinding mechanisms is realized, and the reasonability of adjusting the torques of the unwinding mechanisms is improved.

Description

Technical Field

[0001] The invention relates to the technical field of non-woven fabric feeding, in particular to a feeding method and a feeding mechanism for cutting holes in non-woven fabric. Background Art

[0002] Non-woven fabrics are primarily used for the top layers of diapers and sanitary napkins. Non-woven fabrics with perforated structures are more fluffy and easier to keep dry during use. To improve production efficiency, multiple unwinding mechanisms often work together during the perforated non-woven fabric loading process. However, there is typically only one perforating device, so all unwinding mechanisms are often stacked on a single guide roller at the perforating device, where the perforations are then cut simultaneously.

[0003] Since the roll diameter of the unwinding mechanism often changes gradually during the non-woven fabric cutting process, which often causes changes in parameters such as the linear speed of the unwinding path, and thus affects the normal operation of the non-woven fabric cutting process, it is often possible to adjust the torque of the unwinding mechanism to ensure the normal operation of the non-woven fabric cutting process as much as possible. Currently, the method commonly used to adjust the torque of the equipment is to adjust the torque of the equipment based on manual experience.

[0004] However, when adjusting the torque of the unwinding mechanism through manual experience, the following technical problems often occur:

[0005] When adjusting the torque of the unwinding mechanism through manual experience, the torque of the unwinding mechanism is often adjusted based on the subjective experience of the implementer, resulting in the adjustment result being often affected by the implementer's subjective situation and state, so the adjustment result is often unreasonable, resulting in poor rationality in adjusting the torque of the unwinding mechanism. Summary of the Invention

[0006] In order to solve the technical problem of poor rationality in adjusting the torque of an unwinding mechanism, the present invention proposes a feeding method and a feeding mechanism for cutting holes in non-woven fabrics.

[0007] In a first aspect, the present invention provides a feeding method for cutting holes in a non-woven fabric, the method comprising:

[0008] At the end of the previous preset feeding cycle, the number of guide rollers, the guide roller wrap angle, the path length, the coil diameter, the detection tension sequence, the preset tension, the detection line speed, and the preset traction speed corresponding to each unwinding mechanism included in the feeding mechanism are obtained;

[0009] Determine the linear speed deviation coefficient corresponding to each unwinding mechanism according to the number of guide rollers, guide roller wrap angle, path length, detection tension sequence, preset tension, detection linear speed, and preset traction speed corresponding to each unwinding mechanism;

[0010] Determine the dynamic resistance range corresponding to each unwinding mechanism based on the linear speed deviation coefficient corresponding to each unwinding mechanism, the difference between the detected linear speeds of each unwinding mechanism and the detected linear speeds of other unwinding mechanisms, and the difference between the detected tension and the preset tension in the tension detection sequence;

[0011] Determine the torque adjustment range of each unwinding mechanism based on the dynamic resistance range, detection tension and roll diameter corresponding to each unwinding mechanism;

[0012] Determine the target torque combination based on the torque adjustment ranges corresponding to all unwinding mechanisms included in the feeding mechanism;

[0013] According to the target torque combination, the torque of each unwinding mechanism in the current loading cycle is adjusted.

[0014] In combination with the first aspect above, in one possible implementation, determining the linear speed deviation coefficient corresponding to each unwinding mechanism according to the number of guide rollers, the guide roller wrap angle, the path length, the detection tension sequence, the preset tension, the detection linear speed, and the preset traction speed corresponding to each unwinding mechanism includes:

[0015] The absolute value of the difference between each detected tension and the preset tension in the detected tension sequence corresponding to each unwinding mechanism is determined as a tension oscillation, thereby obtaining a tension oscillation sequence corresponding to each unwinding mechanism;

[0016] The maximum value in the tension oscillation sequence corresponding to each unwinding mechanism is determined as the target tension oscillation corresponding to each unwinding mechanism;

[0017] The absolute value of the difference between the detected linear speed corresponding to each unwinding mechanism and the preset traction speed is determined as a representative deviation of the linear speed corresponding to each unwinding mechanism;

[0018] According to the number of guide rollers, guide roller wrap angle, path length, target tension oscillation and linear speed representative deviation corresponding to each unwinding mechanism, the linear speed deviation coefficient corresponding to each unwinding mechanism is determined.

[0019] In combination with the first aspect above, in one possible implementation, determining the dynamic resistance range corresponding to each unwinding mechanism based on the linear speed deviation coefficient corresponding to each unwinding mechanism, the difference between the detected linear speeds of each unwinding mechanism and the other unwinding mechanisms, and the difference between the detected tension and the preset tension in the tension detection sequence includes:

[0020] Determine any one of the unwinding mechanisms included in the feeding mechanism as a marking unwinding mechanism, and determine each of the unwinding mechanisms included in the feeding mechanism except the marking unwinding mechanism as a reference unwinding mechanism;

[0021] determining a relative speed deviation corresponding to the mark unwinding mechanism according to a difference between a detection linear speed corresponding to the mark unwinding mechanism and detection linear speeds corresponding to all reference unwinding mechanisms;

[0022] determining the absolute value of the difference between the last detected tension in the tension detection sequence corresponding to the mark unwinding mechanism and the preset tension as the reference tension oscillation corresponding to the mark unwinding mechanism;

[0023] determining the asynchronous resistance corresponding to the mark unwinding mechanism according to the relative speed deviation and the linear speed deviation coefficient corresponding to the mark unwinding mechanism;

[0024] determining a non-friction resistance corresponding to the mark unwinding mechanism based on an asynchronous resistance corresponding to the mark unwinding mechanism and a reference tension oscillation;

[0025] Obtaining the overall guide roller friction force corresponding to the marking unwinding mechanism;

[0026] Determine the Euclidean norm between the non-friction resistance corresponding to the mark unwinding mechanism and the friction force of the entire guide roller as the dynamic adjustment tolerance corresponding to the mark unwinding mechanism;

[0027] According to the dynamic adjustment tolerance corresponding to the mark unwinding mechanism and the last detection tension in the detection tension sequence, the dynamic resistance interval corresponding to the mark unwinding mechanism is determined, wherein the center of the dynamic resistance interval is the last detection tension in the detection tension sequence, and the length of the dynamic resistance interval is equal to twice the dynamic adjustment tolerance.

[0028] In combination with the first aspect above, in one possible implementation, determining the relative speed deviation corresponding to the mark unwinding mechanism based on the difference between the detected linear speed corresponding to the mark unwinding mechanism and the detected linear speeds corresponding to all reference unwinding mechanisms includes:

[0029] Determine the average of the detection linear speeds corresponding to all reference unwinding mechanisms as the reference speed representative value corresponding to the marked unwinding mechanism;

[0030] The absolute value of the difference between the detection linear speed corresponding to the mark unwinding mechanism and the reference speed representative value is determined as the relative speed deviation corresponding to the mark unwinding mechanism.

[0031] In combination with the first aspect above, in a possible implementation, determining the asynchronous resistance corresponding to the mark unwinding mechanism according to the relative speed deviation and the linear speed deviation coefficient corresponding to the mark unwinding mechanism includes:

[0032] The product of the relative speed deviation corresponding to the mark unwinding mechanism and the linear speed deviation coefficient is determined as the asynchronous resistance corresponding to the mark unwinding mechanism.

[0033] In combination with the first aspect above, in a possible implementation, determining the non-friction resistance corresponding to the mark unwinding mechanism based on the asynchronous resistance corresponding to the mark unwinding mechanism and the reference tension oscillation includes:

[0034] The sum of the numerical value corresponding to the asynchronous resistance corresponding to the mark unwinding mechanism and the numerical value corresponding to the reference tension oscillation is determined as the non-friction resistance corresponding to the mark unwinding mechanism.

[0035] In combination with the first aspect above, in one possible implementation, determining the torque adjustment range corresponding to each unwinding mechanism according to the dynamic resistance range, detected tension, and reel diameter corresponding to each unwinding mechanism includes:

[0036] The product of the last detected tension in the detection tension sequence corresponding to each unwinding mechanism and the coil diameter is determined as the basic output torque corresponding to each unwinding mechanism;

[0037] According to the basic output torque and dynamic resistance range corresponding to each unwinding mechanism, the torque adjustment range corresponding to each unwinding mechanism is determined, wherein the minimum value in the torque adjustment range is equal to the product of the basic output torque and the minimum value in the dynamic resistance range, and the maximum value in the torque adjustment range is equal to the product of the basic output torque and the maximum value in the dynamic resistance range.

[0038] In combination with the first aspect above, in one possible implementation, determining the target torque combination based on the torque adjustment ranges corresponding to all unwinding mechanisms included in the feeding mechanism includes:

[0039] A preset number of different random numbers are selected from the torque adjustment range corresponding to each unwinding mechanism as reference torques, thereby obtaining a preset number of reference torques corresponding to each unwinding mechanism;

[0040] Any reference torque corresponding to all unwinding mechanisms is used to form a reference torque sequence, thereby obtaining multiple reference torque sequences, wherein different reference torques in the reference torque sequence correspond to different unwinding mechanisms, and the number of reference torques in the reference torque sequence is equal to the number of unwinding mechanisms;

[0041] Acquire the simulated angular velocity and simulated tension corresponding to each reference torque in each reference torque sequence, and obtain the simulated angular velocity sequence and simulated tension sequence corresponding to each reference torque sequence;

[0042] Determine a target value corresponding to each reference torque sequence according to a simulated angular velocity sequence and a simulated tension sequence corresponding to each reference torque sequence;

[0043] The reference torque sequence with the smallest corresponding target value is selected from all reference torque sequences as the target torque combination.

[0044] In combination with the first aspect above, in one possible implementation, determining the target value corresponding to each reference torque sequence according to the simulated angular velocity sequence and the simulated tension sequence corresponding to each reference torque sequence includes:

[0045] Determine any reference torque sequence as a marked torque sequence, and determine the absolute value of the difference between each simulated angular velocity in the simulated angular velocity sequence corresponding to the marked torque sequence and its preset angular velocity as a speed synchronization term, to obtain a speed synchronization term sequence corresponding to the marked torque sequence;

[0046] Determining the absolute value of the difference between each simulated tension and the preset tension in the simulated tension sequence corresponding to the marked torque sequence as a tension balancing term, thereby obtaining a tension balancing term sequence corresponding to the marked torque sequence;

[0047] The target value corresponding to the marked torque sequence is determined according to the speed synchronization item sequence and the tension balance item sequence corresponding to the marked torque sequence, wherein the elements of the speed synchronization item sequence and the tension balance item sequence are both positively correlated with the target value.

[0048] In a second aspect, the present invention provides a feeding mechanism for cutting holes in non-woven fabrics, comprising a rewinding mechanism, a processor and a memory, wherein the processor is used to process instructions stored in the memory to implement the feeding method for cutting holes in non-woven fabrics.

[0049] In a third aspect, a server is provided, comprising a memory and a processor. The memory is configured to store executable program code, and the processor is configured to call and execute the executable program code from the memory, so that the device executes the method of the first aspect or any possible implementation of the first aspect.

[0050] In a fourth aspect, a computer program product is provided, comprising: a computer program code, which, when executed on a computer, enables the computer to execute the method in the first aspect or any possible implementation of the first aspect.

[0051] In a fifth aspect, a computer-readable storage medium is provided, which stores a computer program code. When the computer program code runs on a computer, the computer executes the method in the above-mentioned first aspect or any possible implementation of the first aspect.

[0052] The present invention has the following beneficial effects:

[0053] The present invention provides a feeding method for cutting holes in non-woven fabrics, which adaptively adjusts the torque of different unwinding mechanisms, thereby realizing the coordinated operation of multiple unwinding mechanisms, solving the technical problem of poor rationality in adjusting the torque of the unwinding mechanism, and improving the rationality of adjusting the torque of the unwinding mechanism. Specifically, in the process of adjusting the torque of the unwinding mechanism, the present invention comprehensively considers multiple characteristic factors related to the normal coordinated operation of the unwinding mechanism, such as the number of guide rollers, the guide roller wrap angle, the path length, the roll diameter, the detection tension sequence, the preset tension, the detection line speed and the preset traction speed, and quantifies the line speed deviation coefficient and the dynamic resistance range corresponding to each unwinding mechanism, thereby adaptively quantifying the torque adjustment range corresponding to each unwinding mechanism, and based on the torque adjustment range corresponding to all the unwinding mechanisms included in the feeding mechanism, an optimized target torque combination is obtained, thereby realizing the adjustment of the torque of each unwinding mechanism, and to a certain extent reducing the influence of human subjective factors, thereby improving the rationality of adjusting the torque of the unwinding mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions and advantages of the embodiments of the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0055] Figure 1 This is a flow chart of a feeding method for cutting holes in non-woven fabrics according to the present invention;

[0056] Figure 2 This is a schematic diagram of the overall structure of a feeding mechanism for cutting holes in non-woven fabrics according to the present invention;

[0057] Figure 3 The present invention is a schematic structural diagram of an unwinding roller included in a feeding mechanism for cutting holes in non-woven fabrics.

[0058] Among them, the figure marks include: 1, punching device; 2, unwinding roller; 3, winding roller; 4, deviation corrector; 5, guide roller; 6, waste collection roller. DETAILED DESCRIPTION

[0059] To further illustrate the technical means and effects employed by the present invention to achieve its intended objectives, the following, in conjunction with the accompanying drawings and preferred embodiments, describes in detail the specific implementations, structures, features, and effects of the technical solutions proposed by the present invention. In the following description, references to "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.

[0060] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0061] Nonwoven fabric is typically wound around a cylinder. During hole cutting, the material is first unwound by an unwinding mechanism, then pulled at a constant speed into the hole-cutting device. The hole-cutting device, also known as the punching device, employs an adjustable take-up roller driven by a variable frequency motor. A tension sensor monitors the material tension in real time to prevent loosening or over-tightening. The unwinding mechanism, also known as the unwinding mechanism, can be an adjustable take-up roller with a gear mechanism.

[0062] However, to improve production efficiency, multiple unwinding mechanisms often work together in practice. This can be achieved by using a synchronous belt with internal and external teeth meshing with the reel gears, with springs adjusting the tension. A variable frequency motor actively controls the belt speed, ensuring consistent linear speeds across the multiple unwinding shafts and preventing tooth skipping or slippage.

[0063] Furthermore, when multiple unwinding mechanisms operate in coordination, there is often only one hole cutting device, so all unwinding mechanisms will be superimposed on the same guide roller at the hole cutting device, and then the hole cutting device will cut holes together; and as the unwinding proceeds, the outer diameter of the roll gradually decreases. If the roll diameter parameters are not updated in real time, the correspondence between the inverter output frequency and the line speed will often fail, which will eventually lead to uneven hole gaps when cutting holes in multi-layer non-woven fabrics.

[0064] As the number of multiple unwinding mechanisms increases, the difference in the initial roll diameter and the material consumption rate of each unwinding shaft may lead to significant differences in the roll diameter change rate. If we only rely on the linear speed adjustment of the variable frequency motor based on the fixed roll diameter model, it is often impossible to compensate for the dynamic friction loss of different paths in real time. Even when more than three unwinding mechanisms work together, the control response bandwidth of the inverter often faces extreme challenges. Secondly, the transmission path length of the material from each unwinding mechanism to the hole cutting guide roller is different, and the superimposed roll diameter changes in real time. For example, the reduction in outer diameter causes the angular acceleration to be continuously adjusted, resulting in a cumulative deviation between the actual linear speed of each unwinding shaft and the theoretical calculated value, which in turn causes the tension of the laminated material at the cutting point to fluctuate. Therefore, the present invention dynamically regulates the collaborative unwinding process of the multiple unwinding mechanisms to ensure that in the actual production process, the multiple unwinding mechanisms can complete the feeding process of the non-woven fabric with higher synergy.

[0065] refer to Figure 1 , shows the process of some embodiments of the feeding method for cutting holes in non-woven fabrics of the present invention. The feeding method for cutting holes in non-woven fabrics includes the following steps:

[0066] Step S1, at the end of the previous preset feeding cycle, obtain the number of guide rollers, guide roller wrap angle, path length, roll diameter, detection tension sequence, preset tension, detection line speed and preset traction speed corresponding to each unwinding mechanism included in the feeding mechanism.

[0067] Among them, the previous preset feeding cycle can be a pre-set time period that characterizes the previous torque adjustment cycle. The torque adjustment cycle can be a pre-set cycle. The torque of the feeding mechanism can be adjusted at the beginning of the torque adjustment cycle, and the adjusted torque is maintained until the beginning of the next torque adjustment cycle. For example, the duration corresponding to the preset feeding cycle can be 10 seconds. The next moment of the previous torque adjustment cycle can be the current moment, that is, the previous torque adjustment cycle can be the historical torque adjustment cycle closest to the current moment. The unwinding mechanism is a key equipment for continuous material processing, which realizes stable transportation and winding of materials through tension control, deviation correction and automation components.

[0068] The number of guide rollers corresponding to the unwinding mechanism can be the number of guide rollers on the unwinding path of the unwinding mechanism. The guide roller wrap angle corresponding to the unwinding mechanism can be the average of the contact angles between all guide rollers on the unwinding path of the unwinding mechanism and the coil at the end of the previous preset loading cycle. The path length corresponding to the unwinding mechanism can be the length of the unwinding path of the unwinding mechanism at the end of the previous preset loading cycle. The coil diameter corresponding to the unwinding mechanism can be the diameter of the coil on the unwinding mechanism at the end of the previous preset loading cycle, which can be equal to twice the product of the number of coil turns and the coil thickness. The tension detection sequence corresponding to the unwinding mechanism can be a time series, and the tension detection sequence can be the tension at the end of the unwinding path of the unwinding mechanism measured during the previous preset loading cycle, which can be measured by a tension sensor. The preset tension can be a preset desired tension at the end of the unwinding path during the operation of the unwinding mechanism. The desired tension can be a tension set by the manufacturer that is assumed to be the normal operation of the unwinding mechanism. The detection linear velocity corresponding to the unwinding mechanism may be equal to the product of the angular velocity of the unwinding mechanism and the target radius. The target radius may be equal to half the roll diameter. The preset pulling speed may be a pulling speed of the unwinding mechanism pre-set during operation.

[0069] It should be noted that the number of guide rollers, guide roller wrap angle, path length, reel diameter, and detection line speed corresponding to the unwinding mechanism are often the parameter values of the unwinding mechanism at the end of the previous preset loading cycle. The detection tension sequence corresponding to the unwinding mechanism often represents the tension of the unwinding mechanism during the previous preset loading cycle. In addition, the last detection tension in the detection tension sequence corresponding to the unwinding mechanism often represents the tension of the unwinding mechanism at the end of the previous preset loading cycle.

[0070] Step S2, determining the linear speed deviation coefficient corresponding to each unwinding mechanism according to the number of guide rollers, guide roller wrap angle, path length, detection tension sequence, preset tension, detection linear speed and preset traction speed corresponding to each unwinding mechanism.

[0071] As an example, this step may include the following steps:

[0072] In the first step, the absolute value of the difference between each detected tension and the preset tension in the detected tension sequence corresponding to each unwinding mechanism is determined as tension oscillation, thereby obtaining a tension oscillation sequence corresponding to each unwinding mechanism.

[0073] The number of tension oscillations in the tension oscillation sequence may be equal to the number of tension detections in the tension detection sequence.

[0074] It should be noted that, in addition to the influencing factors of friction and resistance caused by transmission jams, unwinding speed is often also affected by changes in roll diameter, and the asynchronous changes in roll diameter when multiple unwinding mechanisms work together are key factors affecting the coordinated operation of multiple unwinding mechanisms. When the roll diameters of multiple unwinding mechanisms change asynchronously, the linear speeds of each path often need to be dynamically adjusted to match the pulling speed. If the roll diameter of a particular path lags due to material consumption or mechanical errors, the tension of that path will often deviate from the set value, causing periodic tension oscillations.

[0075] In the second step, the maximum value in the tension oscillation sequence corresponding to each unwinding mechanism is determined as the target tension oscillation corresponding to each unwinding mechanism.

[0076] In the third step, the absolute value of the difference between the detected linear speed corresponding to each unwinding mechanism and the preset traction speed is determined as the linear speed representative deviation corresponding to each unwinding mechanism.

[0077] The fourth step is to determine the linear speed deviation coefficient corresponding to each unwinding mechanism based on the number of guide rollers, guide roller wrap angle, path length, target tension oscillation and linear speed representative deviation corresponding to each unwinding mechanism.

[0078] For example, the formula for determining the linear speed deviation coefficient corresponding to the unwinding mechanism can be:

[0079]

[0080] Among them, k i is the linear speed deviation coefficient corresponding to the i-th unwinding mechanism. i is the serial number of the unwinding mechanism included in the feeding mechanism. A i is the target tension oscillation corresponding to the i-th unwinding mechanism. i G is the linear speed deviation corresponding to the i-th unwinding mechanism. i is the number of guide rollers corresponding to the i-th unwinding mechanism. iis the value corresponding to the guide roller wrap angle of the i-th unwinding mechanism. The 180 in the formula corresponding to the linear speed deviation coefficient is the value corresponding to 180°. i is the path length corresponding to the i-th unwinding mechanism.

[0081] It should be noted that Represents the number of guide rollers G i Angle θ with guide roller i The comprehensive influencing factors are: the more complex the path, the more guide rollers there are, the larger the guide roller wrap angle is, the greater the speed deviation is, the greater the impact of the tension is, and the greater the weight of the speed deviation is, because frequent switching from one guide roller to another may aggravate this error. It can be used as a compensation item for the path length. The longer the path, the more significant the delay effect of speed fluctuation transmission. The adjustment sensitivity needs to be reduced to suppress oscillation. When the coil diameter decreases, the path length changes and the compensation item needs to be recalculated. That is, the longer the path, the weaker the effect of speed deviation on tension because there is enough length to share the tension fluctuation caused by speed deviation. i It can represent the real-time linear speed deviation of the i-th unwinding mechanism at the end of the previous preset loading cycle. It can characterize the influence of line speed deviation. i It can characterize the tension oscillation of the i-th unwinding mechanism. The linear speed deviation coefficient can characterize the dynamic influence of the linear speed deviation of the unwinding path on the tension tolerance. Therefore, when The smaller and A i The larger the value, the greater the tension oscillation will be caused even with a small deviation in line speed.

[0082] Step S3, determining the dynamic resistance range corresponding to each unwinding mechanism based on the linear speed deviation coefficient corresponding to each unwinding mechanism, the difference between the detected linear speeds corresponding to each unwinding mechanism and other unwinding mechanisms, and the difference between the detected tension and the preset tension in the detection tension sequence.

[0083] As an example, this step may include the following steps:

[0084] In the first step, any unwinding mechanism included in the feeding mechanism is determined as a marking unwinding mechanism, and each unwinding mechanism included in the feeding mechanism except the marking unwinding mechanism is determined as a reference unwinding mechanism.

[0085] The second step is to determine the relative speed deviation corresponding to the mark unwinding mechanism based on the difference between the detection linear speed corresponding to the mark unwinding mechanism and the detection linear speeds corresponding to all reference unwinding mechanisms, which may include the following sub-steps:

[0086] In the first sub-step, the average value of the detection linear speeds corresponding to all reference unwinding mechanisms is determined as the reference speed representative value corresponding to the above-mentioned marked unwinding mechanism.

[0087] In the second sub-step, the absolute value of the difference between the detection linear speed corresponding to the mark unwinding mechanism and the reference speed representative value is determined as the relative speed deviation corresponding to the mark unwinding mechanism.

[0088] In the third step, the absolute value of the difference between the last detected tension in the tension detection sequence corresponding to the mark unwinding mechanism and the preset tension is determined as the reference tension oscillation corresponding to the mark unwinding mechanism.

[0089] The fourth step is to determine the asynchronous resistance corresponding to the mark unwinding mechanism according to the relative speed deviation and the linear speed deviation coefficient corresponding to the mark unwinding mechanism.

[0090] For example, the product of the relative speed deviation corresponding to the mark unwinding mechanism and the linear speed deviation coefficient can be determined as the asynchronous resistance corresponding to the mark unwinding mechanism.

[0091] The fifth step is to determine the non-friction resistance corresponding to the mark unwinding mechanism according to the asynchronous resistance corresponding to the mark unwinding mechanism and the reference tension oscillation.

[0092] For example, the sum of the numerical value corresponding to the asynchronous resistance corresponding to the mark unwinding mechanism and the numerical value corresponding to the reference tension oscillation can be determined as the non-friction resistance corresponding to the mark unwinding mechanism.

[0093] Step 6: Obtain the overall guide roller friction force corresponding to the above-mentioned marking unwinding mechanism.

[0094] For example, the friction force calculation formula can be used to obtain the friction force of each guide roller on the unwinding path of the marking unwinding mechanism at the end of the previous preset loading cycle, and the sum of the friction forces of all guide rollers on the unwinding path of the marking unwinding mechanism can be determined as the overall guide roller friction force corresponding to the marking unwinding mechanism.

[0095] Optionally, the method for obtaining the friction force of the guide roller can also be: through experiments, obtain the friction force of the guide roller as the temperature of the guide roller increases, and obtain the friction force-temperature curve through least squares fitting, and then obtain the friction force of the guide roller based on the friction force-temperature curve and monitoring the temperature of the guide roller through a temperature sensor.

[0096] In the seventh step, the Euclidean norm between the non-friction resistance corresponding to the above-mentioned mark unwinding mechanism and the friction force of the overall guide roller is determined as the dynamic adjustment tolerance corresponding to the above-mentioned mark unwinding mechanism.

[0097] In the eighth step, the dynamic resistance range corresponding to the mark unwinding mechanism is determined according to the dynamic adjustment tolerance corresponding to the mark unwinding mechanism and the last detection tension in the detection tension sequence.

[0098] The center of the dynamic resistance interval may be the last tension detected in the tension detection sequence, and the length of the dynamic resistance interval may be equal to twice the dynamic adjustment tolerance.

[0099] For example, the dynamic resistance interval corresponding to the unwinding mechanism can be: [F-δ, F+δ], where F is the last detection tension in the detection tension sequence corresponding to the unwinding mechanism, and δ is the dynamic adjustment tolerance corresponding to the unwinding mechanism.

[0100] It should be noted that the linear speed deviation coefficient is calculated to describe the dynamic influence of linear speed deviation of different unwinding paths on tension tolerance. Then, according to the relative linear speed deviation of each non-woven fabric unwinding mechanism in coordination with other unwinding mechanisms, the real-time asynchronous resistance of each unwinding path is obtained. The sum of the real-time asynchronous resistance and the real-time tension oscillation is the real-time non-friction resistance. The real-time non-friction resistance and the real-time friction force are dynamically adjusted to obtain the tolerance. Finally, the dynamic resistance range of each independent non-woven fabric unwinding mechanism is obtained. That is, when multiple unwinding mechanisms are coordinated, the dynamic resistance range of each unwinding mechanism, including mechanical loss and asynchronous resistance, is determined due to different changes in paths and roll diameters. The dynamic resistance of each unwinding mechanism directly affects the torque adjustment range of the unwinding mechanism. Among them, mechanical loss can be friction.

[0101] Secondly, the line speed deviation coefficient can represent the dynamic impact of the unwinding path's line speed deviation on the tension tolerance. The target tension tolerance can be equal to the product of the compensated real-time line speed deviation and the line speed deviation coefficient. Since the resistance fluctuation range needs to be calculated, the maximum target tension tolerance can be taken. The resistance fluctuation range can be the dynamic resistance range, and the maximum target tension tolerance can be the dynamic adjustment tolerance. Therefore, the ratio of the maximum target tension tolerance to the compensated real-time line speed deviation represents the line speed deviation coefficient.

[0102] Step S4: determining the torque adjustment range corresponding to each unwinding mechanism according to the dynamic resistance range, detection tension and winding diameter corresponding to each unwinding mechanism.

[0103] As an example, this step may include the following steps:

[0104] In the first step, the product of the last detected tension in the detection tension sequence corresponding to each unwinding mechanism and the coil diameter is determined as the basic output torque corresponding to each unwinding mechanism.

[0105] It should be noted that according to the principle of torque balance, the basic output torque of the unwinding mechanism can be equal to the product of tension and the real-time coil diameter. The torque generated by the tension on the coil is the main torque required to maintain the material tension.

[0106] The second step is to determine the torque adjustment range corresponding to each unwinding mechanism based on the basic output torque and dynamic resistance range corresponding to each unwinding mechanism.

[0107] The minimum value in the torque adjustment range may be equal to the product of the basic output torque and the minimum value in the dynamic resistance interval, and the maximum value in the torque adjustment range may be equal to the product of the basic output torque and the maximum value in the dynamic resistance interval.

[0108] Step S5: determining a target torque combination based on the torque adjustment ranges corresponding to all the unwinding mechanisms included in the feeding mechanism.

[0109] As an example, this step may include the following steps:

[0110] In the first step, a preset number of different random numbers are selected from the torque adjustment range corresponding to each unwinding mechanism as reference torques, thereby obtaining a preset number of reference torques corresponding to each unwinding mechanism.

[0111] The preset number may be a pre-set number, which may be 20.

[0112] It should be noted that, when the preset number is set larger, more reference torque sequences are subsequently constructed. Since the reference torque sequence represents the available torque combinations, the larger the preset number is set, the closer the target torque combination subsequently screened out is to the optimal torque combination.

[0113] In the second step, any reference torque corresponding to all unwinding mechanisms is used to form a reference torque sequence to obtain multiple reference torque sequences.

[0114] The unwinding mechanisms corresponding to different reference torques in the reference torque sequence may be different, and the number of reference torques in the reference torque sequence may be equal to the number of unwinding mechanisms.

[0115] For example, if there are three unwinding mechanisms, namely the first unwinding mechanism, the second unwinding mechanism, and the third unwinding mechanism, a reference torque corresponding to the first unwinding mechanism, a reference torque corresponding to the second unwinding mechanism, and a reference torque corresponding to the third unwinding mechanism can be used to form a reference torque sequence. The reference torques in the reference torque sequence can be randomly arranged.

[0116] The third step is to obtain the simulated angular velocity and simulated tension corresponding to each reference torque in each reference torque sequence, and obtain the simulated angular velocity sequence and simulated tension sequence corresponding to each reference torque sequence.

[0117] The simulated angular velocity sequence corresponding to the reference torque sequence may be composed of the simulated angular velocities corresponding to all reference torques in the reference torque sequence. The simulated tension sequence corresponding to the reference torque sequence may be composed of the simulated tensions corresponding to all reference torques in the reference torque sequence.

[0118] It should be noted that in the unwinding mechanism, torque, angular velocity, and tension are interrelated. Therefore, given the torque, the angular velocity and tension can be calculated. The simulated angular velocity can be the angular velocity calculated using the reference torque. The simulated tension can be the tension calculated using the reference torque. Torque can be equal to the product of tension and the radius of the unwinding shaft. Torque can also be equal to the ratio of power to angular velocity.

[0119] The fourth step, based on the simulated angular velocity sequence and the simulated tension sequence corresponding to each reference torque sequence, determines the target value corresponding to each reference torque sequence, which may include the following sub-steps:

[0120] In the first sub-step, any reference torque sequence is determined as a marked torque sequence, and the absolute value of the difference between each simulated angular velocity in the simulated angular velocity sequence corresponding to the above marked torque sequence and its preset angular velocity is determined as a speed synchronization item, thereby obtaining a speed synchronization item sequence corresponding to the above marked torque sequence.

[0121] The preset angular velocity can be equal to the ratio of the preset linear velocity to the target radius, where the target radius can be equal to half the corresponding coil diameter. The preset linear velocity can be a preset desired linear velocity along the unwinding path during operation of the unwinding mechanism. The desired linear velocity can be a linear velocity set by the manufacturer that is assumed to be operating normally.

[0122] In the second sub-step, the absolute value of the difference between each simulated tension and the preset tension in the simulated tension sequence corresponding to the marked torque sequence is determined as a tension balance item, thereby obtaining a tension balance item sequence corresponding to the marked torque sequence.

[0123] The third sub-step is to determine the target value corresponding to the marked torque sequence according to the speed synchronization item sequence and the tension balance item sequence corresponding to the marked torque sequence.

[0124] Among them, the elements of the speed synchronization item sequence and the tension balance item sequence can both be positively correlated with the target value.

[0125] For example, the formula for determining the target value corresponding to the marked torque sequence can be:

[0126]

[0127] Where E is the target value corresponding to the marked torque sequence. n is the number of unwinding mechanisms included in the feeding mechanism. i is the sequence number of the unwinding mechanism included in the feeding mechanism. γ is a pre-set weight, and its value range can be (0, 1). For example, γ can be 0.5. H i Q is the value corresponding to the speed synchronization item corresponding to the i-th unwinding mechanism in the speed synchronization item sequence corresponding to the marked torque sequence. i It is the value corresponding to the tension balance item corresponding to the i-th unwinding mechanism in the tension balance item sequence corresponding to the marked torque sequence.

[0128] In the fifth step, the reference torque sequence with the smallest corresponding target value is selected from all reference torque sequences as the target torque combination.

[0129] It should be noted that the tension balance item requires that the actual tension at the end of each unwinding path is as close as possible to the preset tension set by the process; the speed synchronization item requires that the angular velocity of each unwinding mechanism matches the current roll diameter to maintain the line speed; at the same time, the weighted square sum of the tension deviation and the speed deviation is minimized, and the priority of the two is balanced by the weight coefficient; at this time, the set of reference torque sequences corresponding to the minimum target value is often the real-time optimal torque.

[0130] Step S6: adjusting the torque of each unwinding mechanism in the current feeding cycle according to the target torque combination.

[0131] The current loading cycle may represent the ongoing torque adjustment cycle.

[0132] As an example, the torque of each unwinding mechanism may be adjusted to a corresponding torque in the target torque combination during the current loading cycle.

[0133] It should be noted that the embodiment of the present invention can ensure that within each torque adjustment cycle, by analyzing the real-time tension, real-time linear speed, unwinding path, and real-time roll diameter changes of all unwinding mechanisms, the most synergistic optimal torque can be obtained within its torque adjustment range; ensuring the stable coordinated operation of multiple unwinding mechanisms and improving the stability of non-woven fabric feeding.

[0134] The present invention provides a feeding mechanism for cutting holes in non-woven fabrics. The feeding mechanism includes: an unwinding mechanism, a processor and a memory. The processor is used to process instructions stored in the memory to implement the above-mentioned feeding method for cutting holes in non-woven fabrics.

[0135] The overall structure of a feeding mechanism for cutting holes in nonwoven fabrics according to the present invention can be as follows: Figure 2As shown, the feeding mechanism may include: a punching device 1, an unwinding roller 2, a winding roller 3, a deviation corrector 4, a guide roller 5 and a waste collection roller 6. Among them, an unwinding mechanism is composed of an unwinding roller and a plurality of guide rollers on the corresponding unwinding path. The structure of the unwinding roller can be as follows Figure 3 shown.

[0136] The basic operation of the feeding mechanism is typically as follows: the nonwoven fabric roll is placed on a support roller, and multiple unwinding mechanisms unwind synchronously. A variable frequency motor adjusts the unwinding speed based on tension sensor feedback, and a synchronous belt drive ensures matching of the pulling speed. After the material is secured by a clamping device, a screw mechanism straightens the fabric. A photoelectric sensor detects the position in real time, and a servo motor dynamically adjusts the guide roller to correct deviation. The pulling roller is driven by a variable frequency motor and, in conjunction with a limit plate, prevents material slippage and ensures a uniform speed of delivery to the hole-cutting station. A programmable logic controller (PLC) synchronizes the pulling speed with the hole-cutting rhythm. The guide roller assembly eliminates wrinkles with a multi-stage pressure roller, and an adjusting roller dynamically adjusts pressure based on material thickness to ensure a smooth entry into the cutting area. The guide roller assembly, or multi-stage guide roller, comprises a pressure roller, a receiving roller, and an adjusting roller. The combination of the pressure roller and the receiving roller maintains material flatness, and the adjusting roller can be manually or automatically adjusted in height to accommodate varying thicknesses.

[0137] Based on the same inventive concept as the above-described method embodiments, the present invention provides a server comprising a memory and a processor. The memory is configured to store executable program code, and the processor is configured to retrieve and execute the executable program code from the memory, thereby causing the device to execute any of the above-described methods for cutting holes in nonwoven fabrics.

[0138] Based on the same inventive concept as the above-mentioned method embodiment, the present invention provides a computer program product, which includes: computer program code, which, when running on a computer, enables the computer to execute any one of the above-mentioned loading methods for cutting holes in non-woven fabrics.

[0139] Based on the same inventive concept as the above-mentioned method embodiment, the present invention provides a computer-readable storage medium, which stores a computer program code. When the computer program code runs on a computer, the computer executes any one of the above-mentioned loading methods for cutting holes in non-woven fabrics.

[0140] In summary, in the process of adjusting the torque of the unwinding mechanism, the present invention comprehensively considers multiple characteristic factors related to the normal coordinated operation of the unwinding mechanism, such as the number of guide rollers, the guide roller wrap angle, the path length, the roll diameter, the detection tension sequence, the preset tension, the detection line speed and the preset traction speed, etc., and quantifies the line speed deviation coefficient and the dynamic resistance range corresponding to each unwinding mechanism, thereby adaptively quantifying the torque adjustment range corresponding to each unwinding mechanism, and based on the torque adjustment range corresponding to all unwinding mechanisms included in the feeding mechanism, obtains the optimized target torque combination, thereby realizing the adjustment of the torque of each unwinding mechanism, and reducing the influence of human subjective factors to a certain extent, thereby improving the rationality of adjusting the torque of the unwinding mechanism.

[0141] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. A feeding method for cutting holes in non-woven fabrics, characterized in that: The following steps are involved: At the end of the previous preset feeding cycle, the number of guide rollers, the guide roller wrap angle, the path length, the coil diameter, the detection tension sequence, the preset tension, the detection line speed, and the preset traction speed corresponding to each unwinding mechanism included in the feeding mechanism are obtained; Determine the linear speed deviation coefficient corresponding to each unwinding mechanism according to the number of guide rollers, guide roller wrap angle, path length, detection tension sequence, preset tension, detection linear speed, and preset traction speed corresponding to each unwinding mechanism; Determine the dynamic resistance range corresponding to each unwinding mechanism based on the linear speed deviation coefficient corresponding to each unwinding mechanism, the difference between the detected linear speeds of each unwinding mechanism and the detected linear speeds of other unwinding mechanisms, and the difference between the detected tension and the preset tension in the tension detection sequence; Determine the torque adjustment range of each unwinding mechanism based on the dynamic resistance range, detection tension and roll diameter corresponding to each unwinding mechanism; Determine the target torque combination based on the torque adjustment ranges corresponding to all unwinding mechanisms included in the feeding mechanism; According to the target torque combination, the torque of each unwinding mechanism in the current loading cycle is adjusted.

2. A feeding method for cutting holes in non-woven fabrics according to claim 1, characterized in that: The method of determining the linear speed deviation coefficient corresponding to each unwinding mechanism according to the number of guide rollers, the guide roller wrap angle, the path length, the detection tension sequence, the preset tension, the detection linear speed, and the preset traction speed corresponding to each unwinding mechanism includes: The absolute value of the difference between each detected tension and the preset tension in the detected tension sequence corresponding to each unwinding mechanism is determined as a tension oscillation, thereby obtaining a tension oscillation sequence corresponding to each unwinding mechanism; The maximum value in the tension oscillation sequence corresponding to each unwinding mechanism is determined as the target tension oscillation corresponding to each unwinding mechanism; The absolute value of the difference between the detected linear speed corresponding to each unwinding mechanism and the preset traction speed is determined as a representative deviation of the linear speed corresponding to each unwinding mechanism; According to the number of guide rollers, guide roller wrap angle, path length, target tension oscillation and linear speed representative deviation corresponding to each unwinding mechanism, the linear speed deviation coefficient corresponding to each unwinding mechanism is determined.

3. A feeding method for cutting holes in non-woven fabrics according to claim 1, characterized in that: The method of determining the dynamic resistance range corresponding to each unwinding mechanism based on the linear speed deviation coefficient corresponding to each unwinding mechanism, the difference between the detected linear speeds of each unwinding mechanism and the detected linear speeds of other unwinding mechanisms, and the difference between the detected tension and the preset tension in the tension detection sequence comprises: Determine any one of the unwinding mechanisms included in the feeding mechanism as a marking unwinding mechanism, and determine each of the unwinding mechanisms included in the feeding mechanism except the marking unwinding mechanism as a reference unwinding mechanism; determining a relative speed deviation corresponding to the mark unwinding mechanism according to a difference between a detection linear speed corresponding to the mark unwinding mechanism and detection linear speeds corresponding to all reference unwinding mechanisms; determining the absolute value of the difference between the last detected tension in the tension detection sequence corresponding to the mark unwinding mechanism and the preset tension as the reference tension oscillation corresponding to the mark unwinding mechanism; determining the asynchronous resistance corresponding to the mark unwinding mechanism according to the relative speed deviation and the linear speed deviation coefficient corresponding to the mark unwinding mechanism; determining a non-friction resistance corresponding to the mark unwinding mechanism based on an asynchronous resistance corresponding to the mark unwinding mechanism and a reference tension oscillation; Obtaining the overall guide roller friction force corresponding to the marking unwinding mechanism; Determine the Euclidean norm between the non-friction resistance corresponding to the mark unwinding mechanism and the friction force of the entire guide roller as the dynamic adjustment tolerance corresponding to the mark unwinding mechanism; According to the dynamic adjustment tolerance corresponding to the mark unwinding mechanism and the last detection tension in the detection tension sequence, the dynamic resistance interval corresponding to the mark unwinding mechanism is determined, wherein the center of the dynamic resistance interval is the last detection tension in the detection tension sequence, and the length of the dynamic resistance interval is equal to twice the dynamic adjustment tolerance.

4. A feeding method for cutting holes in non-woven fabrics according to claim 3, characterized in that: The determining of the relative speed deviation corresponding to the mark unwinding mechanism according to the difference between the detection linear speed corresponding to the mark unwinding mechanism and the detection linear speeds corresponding to all reference unwinding mechanisms includes: Determine the average of the detection linear speeds corresponding to all reference unwinding mechanisms as the reference speed representative value corresponding to the marked unwinding mechanism; The absolute value of the difference between the detection linear speed corresponding to the mark unwinding mechanism and the reference speed representative value is determined as the relative speed deviation corresponding to the mark unwinding mechanism.

5. A feeding method for cutting holes in non-woven fabrics according to claim 3, characterized in that: The step of determining the asynchronous resistance corresponding to the mark unwinding mechanism according to the relative speed deviation and the linear speed deviation coefficient corresponding to the mark unwinding mechanism includes: The product of the relative speed deviation corresponding to the mark unwinding mechanism and the linear speed deviation coefficient is determined as the asynchronous resistance corresponding to the mark unwinding mechanism.

6. A feeding method for cutting holes in non-woven fabrics according to claim 3, characterized in that: The determining of the non-friction resistance corresponding to the mark unwinding mechanism according to the asynchronous resistance corresponding to the mark unwinding mechanism and the reference tension oscillation includes: The sum of the numerical value corresponding to the asynchronous resistance corresponding to the mark unwinding mechanism and the numerical value corresponding to the reference tension oscillation is determined as the non-friction resistance corresponding to the mark unwinding mechanism.

7. A feeding method for cutting holes in non-woven fabrics according to claim 1, characterized in that: The method of determining the torque adjustment range corresponding to each unwinding mechanism according to the dynamic resistance range, detection tension, and coil diameter corresponding to each unwinding mechanism includes: The product of the last detected tension in the detection tension sequence corresponding to each unwinding mechanism and the coil diameter is determined as the basic output torque corresponding to each unwinding mechanism; According to the basic output torque and dynamic resistance range corresponding to each unwinding mechanism, the torque adjustment range corresponding to each unwinding mechanism is determined, wherein the minimum value in the torque adjustment range is equal to the product of the basic output torque and the minimum value in the dynamic resistance range, and the maximum value in the torque adjustment range is equal to the product of the basic output torque and the maximum value in the dynamic resistance range.

8. The feeding method for cutting holes in non-woven fabrics according to claim 1, characterized in that: The target torque combination is determined based on the torque adjustment ranges corresponding to all unwinding mechanisms included in the feeding mechanism, including: A preset number of different random numbers are selected from the torque adjustment range corresponding to each unwinding mechanism as reference torques, thereby obtaining a preset number of reference torques corresponding to each unwinding mechanism; Any reference torque corresponding to all unwinding mechanisms is used to form a reference torque sequence, thereby obtaining multiple reference torque sequences, wherein different reference torques in the reference torque sequence correspond to different unwinding mechanisms, and the number of reference torques in the reference torque sequence is equal to the number of unwinding mechanisms; Acquire the simulated angular velocity and simulated tension corresponding to each reference torque in each reference torque sequence, and obtain the simulated angular velocity sequence and simulated tension sequence corresponding to each reference torque sequence; Determine a target value corresponding to each reference torque sequence according to a simulated angular velocity sequence and a simulated tension sequence corresponding to each reference torque sequence; The reference torque sequence with the smallest corresponding target value is selected from all reference torque sequences as the target torque combination.

9. A feeding method for cutting holes in non-woven fabrics according to claim 8, characterized in that: Determining the target value corresponding to each reference torque sequence according to the simulated angular velocity sequence and the simulated tension sequence corresponding to each reference torque sequence includes: Determine any reference torque sequence as a marked torque sequence, and determine the absolute value of the difference between each simulated angular velocity in the simulated angular velocity sequence corresponding to the marked torque sequence and its preset angular velocity as a speed synchronization term, to obtain a speed synchronization term sequence corresponding to the marked torque sequence; Determining the absolute value of the difference between each simulated tension and the preset tension in the simulated tension sequence corresponding to the marked torque sequence as a tension balancing term, thereby obtaining a tension balancing term sequence corresponding to the marked torque sequence; The target value corresponding to the marked torque sequence is determined according to the speed synchronization item sequence and the tension balance item sequence corresponding to the marked torque sequence, wherein the elements of the speed synchronization item sequence and the tension balance item sequence are both positively correlated with the target value.

10. A feeding mechanism for cutting holes in non-woven fabrics, characterized in that: The invention comprises an unwinding mechanism, a processor and a memory, wherein the processor is used to process instructions stored in the memory to implement a feeding method for cutting holes in non-woven fabrics according to any one of claims 1 to 9.

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