A method and system for electrostatic elimination of a precursor wire

Abstract

The present application relates to the technical field of static electricity elimination, and particularly relates to a kind of original wire static electricity elimination method and system, comprising: S10: installation elimination system, calibrates the reference voltage Vb of elimination system;Set target static electricity value Sv, set static electricity parameter;S20: obtain the real-time static electricity value Pv of original wire surface;Collect ion concentration around original wire, generate ion concentration feedback signal Vi;S30: calculate static electricity value deviation Ev=Sv-Pv;According to feedback signal Vi and reference voltage Vb, calculate current static electricity elimination capacity Ef;S40: according to static electricity value deviation Ev and elimination capacity Ef, dynamically adjust the static electricity parameter of elimination system;Repeat the execution step S20 to step S40, until Ev≤Eb;Wherein, Eb is the deviation threshold value set artificially, is constant.The present application effectively improves the effect of removing original wire static electricity.

Description

Technical Field

[0001] This invention relates to the field of static electricity elimination technology, and in particular to a method and system for eliminating static electricity in raw silk. Background Technology

[0002] In the production of polymer materials such as carbon fiber and synthetic fibers, a large amount of static electricity is generated during the high-speed unwinding, traction, and winding of the precursor fibers due to friction with metal components such as rollers and guide wheels. The accumulation of static electricity causes dust and fuzz to adhere to the surface of the precursor fibers, resulting in fiber surface defects (such as fuzz and broken ends), seriously affecting product quality. Furthermore, electrostatic discharge may cause fires or explosions, threatening production safety. Therefore, how to efficiently and accurately eliminate static electricity in the precursor fibers has become a key technical challenge for improving production efficiency and ensuring safety.

[0003] Currently, mainstream electrostatic elimination technologies typically rely solely on feedback from a single electrostatic value to adjust high-voltage parameters. This approach cannot detect ion concentration signals in real time or quantify the actual elimination capability of the electrostatic bar. Under this feedback from a single electrostatic value signal, the adjustment of high-voltage parameters is based solely on static deviations, making it impossible to predict whether the elimination capability is attenuating or has a tendency to attenuate, resulting in adjustment lag. Furthermore, frequent and significant adjustments to the high-voltage value can cause oscillations in the elimination system.

[0004] Therefore, there is an urgent need for a method and system for static elimination of raw silk by dynamically adjusting the system parameters through multi-signal collaborative feedback, in order to improve the effect of static elimination of raw silk. Summary of the Invention

[0005] In view of at least one of the above technical problems, the present invention provides a method and system for eliminating static electricity in raw silk, which uses dual-signal collaborative feedback to dynamically adjust the elimination system parameters to achieve a better effect in eliminating static electricity in raw silk.

[0006] This invention provides a method for eliminating static electricity in raw silk, comprising the following steps: S10: Install the elimination system, calibrate the reference voltage Vb of the elimination system; set the target static value Sv, and set the static parameters; S20: Obtain the real-time electrostatic value Pv on the surface of the precursor fiber; collect the ion concentration around the precursor fiber and generate an ion concentration feedback signal Vi; S30: Calculate the electrostatic discharge deviation Ev = Sv - Pv; Calculate the current electrostatic discharge capability Ef based on the feedback signal Vi and the reference voltage Vb. S40: Dynamically adjust the electrostatic parameters of the elimination system based on the electrostatic value deviation Ev and the elimination capacity Ef; Repeat steps S20 to S40 until Ev ≤ Eb; Where Eb is a manually set deviation threshold, which is a constant.

[0007] In some embodiments of the present invention, the preferred process for calibrating the reference voltage Vb of the elimination system in step S10 is as follows: Construct Vb = (V1 + V2 + ... + Vn) / n; Where n is the number of times the voltage value is measured under electrostatic-free conditions during calibration; V1 is the voltage reading under the first measurement without static electricity, V2 is the voltage reading under the second measurement without static electricity, ..., Vn is the voltage reading under the nth measurement without static electricity.

[0008] In some embodiments of the present invention, the calculation of the current electrostatic elimination capability Ef in step S30 is specifically as follows: Calculate Ef = (Vi - Vb) / (k·Vh); Where k is the environmental coefficient, a constant set by humans; Vh is the instantaneous high voltage value in the real-time operation of the elimination system.

[0009] In some embodiments of the present invention, the dynamic adjustment of the electrostatic parameters of the elimination system in step S40 specifically involves: Eliminate the default PID control mode after system startup; When Ef < E, high-voltage compensation mode is adopted to increase the Vh value; When Ef≥E, the PID control mode is adopted to calculate the high voltage frequency adjustment amount ΔF to adjust the electrostatic parameters. Where E is a manually set elimination threshold, which is a constant.

[0010] In some embodiments of the present invention, increasing the Vh value in step S40 includes: Calculate Vhn = Vh · {1 + min[(E - Ef) · 2, 0.5]}; Let Vh = Vhn and run it in the elimination system.

[0011] In some embodiments of the present invention, the following steps are also included: S50: In high-voltage compensation mode, after Ef < E for a predetermined time, a maintenance warning is triggered; In PID control mode, when |Ev| > Eb and the high-voltage frequency adjustment ΔF reaches the preset limit value, an emergency shutdown warning is triggered.

[0012] The present invention also provides a raw silk static electricity elimination system, comprising: Framework structure; The unwinding roller is installed on one side of the frame structure; The idler roller is installed on the other side of the frame structure along the path of the raw yarn, opposite to the unwinding roller; The static elimination module is installed on the frame structure, on the side of the raw yarn travel path, away from the unwinding roller; The control module is installed on the side of the frame structure near the static elimination module; The wire winding machine is set up opposite the frame structure; The raw yarn is released by the unwinding roller, guided by the idler roller, and then its static electricity is eliminated by the static elimination module before being wound up by the winding machine.

[0013] In some embodiments of the present invention, the static electricity elimination module includes: An electrostatic bar is set perpendicular to the length direction of the original wire; several evenly distributed needle tips are opened on the surface of the electrostatic bar along the length direction of the electrostatic bar. An electrostatic detector connected to an electrostatic bar.

[0014] In some embodiments of the present invention, the electrostatic detector includes: An electrostatic sensor is used to detect the electrostatic value Pv on the surface of the raw silk. The electrode plate, located on the side of the electrostatic bar near the needle tip, is used to collect the ion concentration around the protofilament and generate a feedback signal Vi.

[0015] In some embodiments of the present invention, the control module includes: a calibration unit for calibrating the reference voltage Vb; and a dynamic adjustment unit for switching the elimination system to PID adjustment mode or high voltage compensation mode.

[0016] The beneficial effects of this invention are as follows: By dynamically calibrating the reference voltage, this invention improves the accuracy of ion concentration detection and effectively reduces the impact of environmental interference; by collecting the electrostatic value and ion concentration feedback signal of the raw fiber surface, the two inventions work together to improve the accuracy of judging the elimination ability of the elimination system, thereby switching between the two modes of the elimination system and effectively improving the effect of eliminating static electricity from the raw fiber; by limiting the voltage increase, the safety of the elimination system is improved, effectively preventing damage to the elimination system caused by voltage overload. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the steps of the original fiber static elimination method in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a production line equipped with a raw silk static elimination system in an embodiment of the present invention; Figure 3This is a schematic diagram of the electrostatic elimination module in the original silk electrostatic elimination system of this invention.

[0019] Reference numerals in the attached diagram: 1. Frame structure; 2. Unwinding roller; 3. Support roller; 4. Static elimination module; 41. Static bar; 411. Needle tip; 42. Static detector; 5. Take-up machine. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0022] Unless otherwise defined, 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 pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] This invention provides a method such as Figure 1 The method for eliminating static electricity in the raw silk shown includes the following steps: S10: Install the electrostatic elimination system and calibrate its reference voltage Vb; set the target electrostatic value Sv and set the electrostatic parameters; these parameters include the target electrostatic value Sv, the initial high voltage value Vh output by the elimination system, and the high voltage frequency (adjusted by the high voltage frequency adjustment amount ΔF in subsequent PID control mode), etc., which are related to the electrostatic elimination system.

[0024] S20: Obtain the real-time electrostatic value Pv on the surface of the precursor fiber; collect the ion concentration around the precursor fiber and generate an ion concentration feedback signal Vi; S30: Calculate the electrostatic discharge deviation Ev = Sv - Pv; Calculate the current electrostatic discharge capability Ef based on the feedback signal Vi and the reference voltage Vb. S40: Dynamically adjust the electrostatic parameters of the elimination system based on the electrostatic value deviation Ev and the elimination capacity Ef; Repeat steps S20 to S40 until Ev ≤ Eb; Where Eb is a manually set deviation threshold, which is a constant.

[0025] The specific working principle of this invention is as follows: After the system installation is completed, an initial system initialization is performed. The naturally induced voltage in the system is measured multiple times without the precursor fiber in motion. After eliminating accidental interference data, the reference voltage Vb is calculated. This reference value represents the initial state without electrostatic interference and is used for dynamic correction of the subsequent ion concentration feedback signal Vi. Simultaneously, a target electrostatic value Sv and a safe deviation threshold Eb are set based on the precursor fiber material characteristics, serving as control targets and risk boundaries.

[0026] After the precursor fiber begins its journey, the elimination system operates, simultaneously collecting two key data points: The real-time electrostatic intensity (Pv) on the precursor fiber surface is detected using a non-contact acquisition method, directly reflecting the system's effectiveness in neutralizing static electricity; The ion concentration around the precursor fiber is collected to generate an ion concentration feedback signal (Vi). Combining these two data points avoids misjudgments by the elimination system due to distortion caused by a single data point.

[0027] Based on the real-time static electricity value Pv on the raw silk surface, the static electricity value deviation Ev = Sv - Pv is used to calculate the static electricity value deviation to quantify the difference between the current static electricity and the target. If |EV| is too large, it indicates that the neutralization capability of the elimination system needs to be enhanced. Then, the current static electricity elimination capability Ef is calculated based on the feedback signal Vi and the reference voltage Vb. If the static electricity elimination capability Ef is too low, it indicates that the efficiency of the elimination system in eliminating static electricity is seriously insufficient and needs to be improved. By combining the calculation results of the static electricity value deviation Ev and the static electricity elimination capability Ef, the static electricity parameters of the elimination system are dynamically adjusted. This process can be repeated multiple times until the effect of neutralizing static electricity reaches the target range.

[0028] In some embodiments of the present invention, the preferred process for calibrating the reference voltage Vb of the elimination system in step S10 is as follows: Construct Vb = (V1 + V2 + ... + Vn) / n; Where n is the number of times the voltage value is measured under electrostatic-free conditions during calibration; V1 is the voltage reading under the first measurement without static electricity, V2 is the voltage reading under the second measurement without static electricity, ..., Vn is the voltage reading under the nth measurement without static electricity.

[0029] By repeatedly measuring the voltage values ​​of the electrode plates in the electrostatic-free state to eliminate the static electricity, the average value Vb is calculated as the reference voltage. This can effectively offset the accidental interference in a single measurement, establish the initial voltage under this working environment, and lay the foundation for the subsequent calibration of the generated ion concentration feedback signal Vi, thus avoiding the elimination of misjudgments caused by the lack of calibration. In addition, the dynamic calibration mechanism significantly enhances the environmental adaptability and long-term stability of the system.

[0030] In some embodiments of the present invention, the calculation of the current electrostatic elimination capability Ef in step S30 is specifically as follows: Calculate Ef = (Vi - Vb) / (k·Vh); Wherein, k is the environmental coefficient, a constant set by the user; it can be calculated from a production line operating stably for a long time using experimental calibration methods; it can also be established by creating a table showing the correspondence between environmental parameters and k based on historical data or industry experience; or it can be set using various methods such as model building. Vh is the instantaneous high pressure value during the real-time operation of the elimination system; the higher the instantaneous high pressure value Vh, the stronger the theoretical ion generation capacity of the elimination system.

[0031] The Vi-Vb value reflects the actual effective ion concentration, and combined with the instantaneous high voltage value Vh and the environmental coefficient k, the neutralization ability of the elimination system to neutralize the static electricity of the original fiber is dynamically evaluated. The static elimination ability Ef represents the ratio of the actual ion generation efficiency to the theoretical maximum ability, which measures the static elimination ability of the elimination system.

[0032] In some embodiments of the present invention, the dynamic adjustment of the electrostatic parameters of the elimination system in step S40 specifically involves: Eliminate the default PID control mode after system startup; When Ef < E, high-voltage compensation mode is adopted to increase the Vh value; When Ef≥E, the PID control mode is adopted to calculate the high voltage frequency adjustment amount ΔF to adjust the electrostatic parameters. Where E is a manually set elimination threshold, which is a constant.

[0033] This design step dynamically selects the optimal control strategy based on the electrostatic elimination capability Ef, balancing efficiency and energy consumption. When the elimination capability Ef < E, it indicates insufficient efficiency of the elimination system, requiring enhanced ion generation capability. The system is then adjusted to high-voltage compensation mode to increase the instantaneous high-voltage value Vh and increase ion density, thus quickly restoring ion generation capability and rapidly neutralizing static electricity on the fiber surface, preventing electrostatic runaway. The PID control mode maintains steady state through frequency (the pulse output frequency of the high-voltage power supply in the elimination system) fine-tuning and error prediction, precisely adjusting the frequency to maintain a stable electrostatic neutralization effect with low energy consumption. The higher the high-voltage frequency adjustment ΔF, the more ions are released per unit time, and the faster the static electricity on the fiber surface is neutralized. The calculation of the high-voltage frequency adjustment ΔF using the PID algorithm formula is existing technology and will not be elaborated further. The synergistic cooperation of the two modes overcomes the limitations of traditional single control modes, avoiding the losses caused by continuous high-voltage overload in high-voltage compensation mode and solving the response lag defect of PID control mode. Ultimately, it achieves a fast, accurate, and low-energy electrostatic elimination effect, providing a reliable guarantee for high-performance fiber production.

[0034] In some embodiments of the present invention, increasing the Vh value in step S40 includes: Calculate Vhn = Vh · {1 + min[(E - Ef) · 2, 0.5]}; Let Vh = Vhn and run it in the elimination system.

[0035] In the formula, (E-Ef)·2 indicates that the greater the difference between the elimination capacity Ef and the threshold E, the higher the compensation range, ensuring that the high voltage increase is proportional to the degree of equipment efficiency degradation. The voltage can be increased as needed, avoiding the redundant energy consumption of continuous high voltage operation in traditional schemes. Furthermore, by limiting the voltage prompt to not exceed 50% through min[(E-Ef)·2, 0.5], damage to the elimination system caused by overload is prevented.

[0036] Preferably, it also includes the following steps: S50: In high-voltage compensation mode, after Ef < E for a predetermined time, a maintenance warning is triggered; the predetermined time can be set with reference to historical data and expert experience, so that the entire elimination system is within a safe range.

[0037] In PID control mode, when |Ev| > Eb and the high-voltage frequency adjustment ΔF reaches the preset limit value, an emergency shutdown warning is triggered.

[0038] Step S50 provides a multi-level safety protection and intelligent maintenance mechanism for the raw yarn electrostatic elimination system. When the high-voltage compensation mode is triggered for a certain period, if the elimination capacity Ef does not improve significantly, it indicates a continuous decline in the system's efficiency, potentially suggesting system aging or mitigation anomalies. A maintenance warning is issued to prompt planned maintenance of the elimination system, preventing sudden failures that could have a greater impact on the production line. Furthermore, when the high-voltage frequency adjustment ΔF in PID control mode reaches the preset limit, and the electrostatic deviation remains large, it indicates that the elimination system has adjusted its electrostatic parameters as much as possible to improve the elimination effect, but still cannot neutralize the electrostatic charge on the raw yarn surface. In this case, immediate shutdown is necessary to prevent continuous overload of the elimination system or other safety accidents.

[0039] This invention also provides a raw silk static elimination system, such as Figure 2 and Figure 3 As shown, it includes: Frame structure 1 is used to support the entire elimination system; The unwinding roller 2 is installed on one side of the frame structure 1; The idler roller 3 is installed on the other side of the frame structure 1 along the original yarn travel path, opposite to the unwinding roller 2; The static electricity elimination module 4 is installed on the frame structure 1, on the raw yarn travel path, on the side of the idler roller 3 away from the unwinding roller 2, that is, downstream of the idler roller 3, close to the raw yarn surface, and can directly neutralize the static electricity generated by the raw yarn due to various reasons. The control module is installed on the side of the frame structure 1 near the static elimination module 4; The take-up machine 5 is set opposite to the frame structure 1 and takes up the original yarn that has been neutralized by static electricity; The raw yarn is released by the unwinding roller 2, guided by the idler roller 3, and after the static electricity is eliminated by the static elimination module 4, it is wound up by the winding machine 5.

[0040] like Figure 3 As shown, in some embodiments of the present invention, the static electricity elimination module 4 includes: An electrostatic bar 41 is set perpendicular to the length direction of the precursor fiber; several evenly distributed needle tips 411 are opened on the surface of the electrostatic bar 41 along the length direction of the electrostatic bar 41 to ensure that ion release covers all precursor fibers and avoid static electricity residue at the edge of the precursor fibers caused by single-point ion release. The principle of the electrostatic bar 41 in eliminating static electricity on the surface of the original wire is as follows: high voltage is applied to the needle tip 411, and the needle tip 411 acts as a discharge source to generate ions. Positive high voltage will generate positive ions, and negative high voltage will generate negative ions. The high voltage uses a sinusoidal signal, which will generate positive and negative ions in the air. When positive and negative ions act on a charged object, the static electricity will be eliminated.

[0041] The electrostatic detector 42 is connected to the electrostatic bar 41.

[0042] In some embodiments of the present invention, the electrostatic detector 42 includes: An electrostatic sensor is used to detect the electrostatic value Pv on the surface of the raw silk. The electrode plate is set on the side of the electrostatic bar 41 near the needle tip 411. When there are a large number of ions in the air, the electrode plate will sense a certain amount of charge and generate a small voltage. After detection by the circuit, the signal is amplified to obtain a stable signal, which can be used to collect the ion concentration around the protofilament and used as feedback for the current electrostatic elimination intensity to generate a feedback signal Vi.

[0043] In some embodiments of the present invention, the control module includes: a calibration unit for calibrating the reference voltage Vb; and a dynamic adjustment unit for switching the elimination system to PID adjustment mode or high voltage compensation mode.

[0044] Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A method for eliminating static electricity in raw silk, characterized in that, Includes the following steps: S10: Install the elimination system, calibrate the reference voltage Vb of the elimination system; set the target static value Sv, and set the static parameters; S20: Obtain the real-time electrostatic value Pv on the surface of the precursor fiber; collect the ion concentration around the precursor fiber and generate an ion concentration feedback signal Vi; S30: Calculate the electrostatic deviation Ev = Sv - Pv; The current electrostatic discharge capability Ef is calculated based on the feedback signal Vi and the reference voltage Vb. The electrostatic discharge capability Ef = (Vi - Vb) / (k·Vh). Where k is the environmental coefficient, a constant set by humans; Vh is the instantaneous high voltage value to be eliminated during real-time operation of the system; S40: Dynamically adjust the static electricity parameters of the elimination system based on the static electricity value deviation Ev and the elimination capacity Ef, including: Eliminate the default PID control mode after system startup; When Ef < E, high-voltage compensation mode is adopted to increase the Vh value; When Ef≥E, the PID control mode is adopted to calculate the high voltage frequency adjustment amount ΔF to adjust the electrostatic parameters. Where E is a manually set elimination threshold, which is a constant; Repeat steps S20 to S40 until Ev ≤ Eb; Where Eb is a manually set deviation threshold, which is a constant.

2. The method for eliminating static electricity in raw silk according to claim 1, characterized in that, The preferred procedure for calibrating the reference voltage Vb of the elimination system in step S10 is as follows: Construct Vb = (V1 + V2 + ... + Vn) / n; Where n is the number of times the voltage value is measured under electrostatic-free conditions during calibration; V1 is the voltage reading under the first measurement without static electricity, V2 is the voltage reading under the second measurement without static electricity, ..., Vn is the voltage reading under the nth measurement without static electricity.

3. The method for eliminating static electricity in raw silk according to claim 2, characterized in that, Step S40, which involves increasing the Vh value, includes: Calculate Vhn = Vh · {1 + min[(E - Ef) · 2, 0.5]}; Let Vh = Vhn and run it in the elimination system.

4. The method for eliminating electrical discharge in the raw silk according to claim 2, characterized in that, It also includes the following steps: S50: After Ef < E for a certain period of time in high-voltage compensation mode, a maintenance warning is triggered; In PID control mode, when |Ev| > Eb and the high-voltage frequency adjustment ΔF reaches the preset limit value, an emergency shutdown warning is triggered.

5. A raw silk static electricity elimination system, used in the raw silk static electricity elimination method as described in any one of claims 1 to 4, characterized in that, include: Frame structure (1); An unwinding roller (2) is installed on one side of the frame structure (1); The idler roller (3) is installed on the other side of the frame structure (1) along the original yarn travel path, opposite to the unwinding roller (2); The static elimination module (4) is disposed on the frame structure (1) on the raw yarn travel path, on the side of the idler roller (3) away from the unwinding roller (2); The control module is installed on the side of the frame structure (1) near the static elimination module (4); A take-up machine (5) is set up opposite to the frame structure (1); The raw yarn is released by the unwinding roller (2), guided by the idler roller (3) in sequence, and after the static electricity is eliminated by the static elimination module (4), it is wound up by the winding machine (5).

6. The static electricity elimination system for raw silk according to claim 5, characterized in that, The static electricity elimination module (4) includes: An electrostatic bar (41) is set perpendicular to the length direction of the original wire; a plurality of uniformly distributed needle tips (411) are opened on the surface of the electrostatic bar (41) along the length direction of the electrostatic bar (41); An electrostatic detector (42) is connected to the electrostatic bar (41).

7. The static electricity elimination system for raw silk according to claim 6, characterized in that, The electrostatic detector (42) includes: an electrostatic sensor for detecting the electrostatic value Pv on the surface of the raw silk; An electrode plate is disposed on the side of the electrostatic bar (41) near the needle tip (411) to collect the ion concentration around the profilosome and generate a feedback signal Vi.

8. The static electricity elimination system for raw silk according to claim 5, characterized in that, The control module includes: a calibration unit for calibrating the reference voltage Vb; and a dynamic adjustment unit for switching the elimination system to PID adjustment mode or high voltage compensation mode.

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