Method of mechanically compensating for the size of a glass fiber yarn after fly spinning

Abstract

This invention discloses a method for mechanically compensating for the fiberglass yarn count after fiber fly, belonging to the field of fiberglass technology. It solves the defect in existing technologies where, due to the low temperature of the spinneret after fiber fly, the first yarn cake after reloading results in a low inner layer count, leading to product defects. The method includes the following steps: 1. Investigating the impact of the stopping time of the drawing equipment on the change in fiber tex after fiber fly, determining the stopping time and the stopping compensation curvature a1 for the inner layer count of the yarn cake; 2. Calculating the average stopping time T1 for on-site workers, and determining the change in the first yarn cake count after the stopping time T1, determining the curve number compensation curvature a2; 3. Deriving the formula for compensating the yarn count change based on the curve change parameters obtained in steps 1 and 2; 4. Verifying whether the formula for compensating the yarn count change based on the drawing machine speed is applicable to the actual product yarn count compensation after fiber fly. This invention is mainly used in the fiberglass industry.

Description

Technical Field

[0001] This invention belongs to the field of glass fiber technology, and more specifically, it relates to a method for mechanically compensating for the number of glass fiber yarns after shavings have been removed. Background Technology

[0002] When parameters such as flow rate and product tex are input, the normal operation of a wire drawing machine maintains a consistent head speed according to the set flow rate. That is, the head speed gradually decreases from a high speed to a constant speed. After the stencil loses wire, the temperature of the stencil drops, resulting in a low inner layer number of the first wire cake after reloading. This leads to a defective product, which is usually downgraded and sold at a reduced price, resulting in a low product yield and greatly reducing the company's production efficiency.

[0003] For example, Chinese invention patent application number 202310254374.5 discloses an automatic detection and correction device for fiberglass yarn count and its usage method. The disadvantage of its automatic control of the spinneret temperature and drawing machine speed is that, due to the high degree of automation, each piece of equipment needs to be added, resulting in high investment costs and complicated installation. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and to provide a method for mechanically compensating for the number of glass fiber yarns after fly filaments.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] A method for mechanically compensating for fiberglass yarn count after fly shavings includes the following steps:

[0007] S1: Investigate the effect of the duration of the glass fiber drawing equipment shutdown on the change of glass fiber tex after glass fiber fly, and determine whether the change of product number caused by the change of spinneret temperature after shutdown varies with the duration of time. If it varies with the duration of time, determine the relationship between the duration of shutdown and the shutdown compensation curvature a1 of the inner layer number of the fiber cake.

[0008] S2: Calculate the average stopping time T1 for on-site employees, and determine the change in the number of the first yarn package after the yarn flyaway caused by the stopping time T1. Obtain the number change curve by shaving the yarn, and obtain the time of number change of the first full inner layer of the yarn flyaway from the curve. Determine the curvature a2 of the curve number change compensation on the machine.

[0009] S3: Based on the curve change parameters obtained in steps S1 and S2, derive the formula for the change of the wire drawing machine speed compensation number;

[0010] S4: Verify whether the formula for the change of the wire drawing machine speed compensation number is applicable to the actual product's wire number compensation after the wire is thrown.

[0011] Preferably, the method for determining the parking time duration and the parking compensation curvature a1 of the inner layer number of the silk cake in step S1 is as follows:

[0012] An on-site investigation was conducted, and the downtime of employees operating the wire drawing equipment was selected. Samples were taken from the first wire cake that was reloaded after multiple downtimes. The inner layer number of the wire cake was detected, and a curve showing the change in the length of downtime and the inner layer number of the wire cake was obtained. The downtime compensation curvature a1 was determined based on the direction of the curve change. Here, a1 is the change index, which can be set. The set curve is fitted to the actual change curve, so that the speed after compensation fits the number curve.

[0013] Preferably, the method for determining the curve number and the vehicle compensation curvature a2 in step S2 is as follows:

[0014] Based on the average on-site parking time of 3 minutes as T1, a curve of the change in yarn number after loading the yarn package during the parking period is obtained. Based on the direction of the curve change, the curvature a2 of the yarn number loading compensation is calculated, and the initial inner layer number tex1, the time T2 from tex1 to the normal number Tex, and the number change ratio are obtained.

[0015] Preferably, in step S3, the normal drawing machine speed is to maintain a stable yarn count (i.e., a constant linear speed), which decreases from the inside out. Therefore, to maintain a stable yarn count in the inner layer of the direct yarn after flyback, it is assumed that the initial drawing machine speed after reloading is reduced relative to the normal drawing speed based on the change in the yarn count of the first full-boil direct yarn after flyback, until the yarn count meets the standard and is consistent with the normal drawing speed. This improves the ability to keep the yarn count in the inner layer of the reloaded yarn within the acceptable range. The formula for compensating for the change in yarn count by the drawing machine speed is as follows:

[0016] b = 1 - tex1 / Tex (1)

[0017] Where b is the compensation ratio (%), tex1 is the initial number of the inner layer, and Tex is the normal number.

[0018] Preferably, in step S3, the speed compensation number of the wire drawing machine includes speed compensation during the stopping process and speed compensation during the loading process.

[0019] Preferably, the method for speed compensation during the parking process is as follows:

[0020] When stopping, the initial speed ω0 is compensated based on the actual stopping time t1. The compensated initial speed is ω′0, and the compensation function is as follows:

[0021]

[0022] S31: When t1≤T1, a1 can be set to take values ​​in the range (0, +∞) so that ω′0 matches the actual trend of the number change.

[0023] S32: When t1 > T1

[0024] ω′0=ω0·(1-b); (3)

[0025] Where T1 is the parking compensation time (s), a1 is the parking compensation curvature, t1 is the actual parking time, ω0 is the initial speed, and ω′0 is the initial speed after compensation.

[0026] Preferably, the method for speed compensation during the loading process is as follows:

[0027] When getting back into the vehicle for the first time after parking, the current engine speed ω is compensated based on the ω′0 value after the shutdown compensation and the actual time t2 before getting back in the vehicle. The compensated engine speed is ω′, and the compensation function is as follows:

[0028]

[0029] S33: When t2≤T2, a2 ​​can be set to take values ​​in the range of (0,+∞) so that ω′0 matches the actual number change trend;

[0030] S34: When t2 > T2

[0031] ω′=ω (5)

[0032] Where ω′ is the compensated rotational speed, ω is the current rotational speed, T2 is the onboard compensation time (s), t2 is the actual onboard time, and a2 is the onboard compensation curvature.

[0033] Preferably, the wire drawing machine program is modified, and the parameter program is set according to formula (1)-formula (5). The input parameters a1, T1, a2, T2, and b are set according to the actual wire drawing and wire flying stop time and the machine loading time to realize mechanical compensation after the wire drawing machine flies.

[0034] Preferably, the verification method for whether the formula for the change of the wire drawing machine speed compensation number in step S4 is applicable to the compensation of the number after the actual product is as follows:

[0035] S41: After setting the operating parameters of the drawing machine, load the first full bobbin of yarn again, perform tex yarn shaving test, and obtain the change curve;

[0036] S42: Check the inner layer of the curve and determine whether the set parameters are valid based on the fluctuation of the inner layer number of the silk cake (normal number Tex fluctuation is within 100).

[0037] Compared with the prior art, the beneficial effects of the present invention are:

[0038] 1. By exploring the effect curve and curvature a1 of the length of parking time on the change of tex of the inner layer of glass fiber in the silk cake through step S1, the compensation error can be eliminated in detail and comprehensively.

[0039] 2. Through step S2, we explored the curve of the change between the average parking time of employees and the number of the inner layer of the silk cake;

[0040] 3. By compensating for the low inner layer number of the wire cake after the wire drawing fly filaments are loaded onto the machine by adjusting the speed of the wire drawing machine in step S3, the temperature change of the spindle plate is not affected, thus protecting the stability of the wire drawing operation.

[0041] 4. By comparing and verifying the change in the yarn drawing and shaving detection number after inputting the parameters in step S4, the effectiveness of the compensation is verified.

[0042] 5. Compared with the existing spindle temperature compensation technology, the present invention is simple to operate, can be modified and controlled from the wire drawing machine system, and is relatively easy to install and debug on a single machine without affecting the operation of other machines.

[0043] In summary, this invention can control the number of inner layers of glass fiber yarn rolls, ensure the consistency of the number of inner and outer layers of the yarn rolls, improve the number of inner layers of the yarn rolls, significantly reduce the number of products with unqualified numbers, improve the production yield, and improve the production efficiency of enterprises. Attached Figure Description

[0044] Figure 1 This is a graph showing the trend of parking time and the number of inner layers of the silk cake according to the present invention;

[0045] Figure 2 This refers to the yarn number of the first yarn cake to be shaving during the 3-minute stop in this invention;

[0046] Figure 3 This is a schematic diagram of the parking compensation for the present invention;

[0047] Figure 4 This is a schematic diagram of the vehicle compensation method of the present invention;

[0048] Figure 5 This is a graph showing the changes in the operating parameters of the drawing machine in this invention when the first full bobbin of yarn is reloaded for tex yarn shaving detection. Detailed Implementation

[0049] The present invention will be further described below through specific embodiments and in conjunction with the accompanying drawings.

[0050] Example 1:

[0051] A method for mechanically compensating for fiberglass yarn count after fly shavings includes the following steps:

[0052] S1: Investigate the effect of the length of time the drawing equipment stops after glass fiber shavings fly on the change of glass fiber tex, and determine whether the change of product number caused by the change of spinneret temperature after stopping changes with the length of time. If it changes with the length of time, determine the stopping time and the stopping compensation curvature a1 of the inner layer number of the fiber cake, where tex generally refers to the number of the fiber cake.

[0053] S2: Calculate the average stopping time T1 for on-site employees, and determine the change in the number of the first yarn package after the yarn flyaway caused by the stopping time T1. Obtain the number change curve by shaving the yarn, and obtain the time of number change of the first full inner layer of the yarn flyaway from the curve. Determine the curvature a2 of the curve number change compensation on the machine.

[0054] S3: Based on the curve change parameters obtained in steps S1 and S2, derive the formula for the change of the wire drawing machine speed compensation number;

[0055] S4: Verify whether the formula for the change of the wire drawing machine speed compensation number is applicable to the actual product's wire number compensation after the wire is thrown.

[0056] Furthermore, the method for determining the parking time duration and the parking compensation curvature a1 of the inner layer number of the silk cake in step S1 is as follows:

[0057] An on-site investigation was conducted, and the downtime of employees operating the wire drawing equipment was selected. Samples were taken from the first wire cake loaded onto the machine after multiple downtimes, and the inner layer number of the wire cake was measured. A curve showing the change in the inner layer number of the wire cake based on the downtime was generated. Figure 1 As shown, the parking compensation curvature a1 is determined according to the direction of curve change, where a1 is the change index, which can be set. The set curve is fitted to the actual change curve, so that the compensated speed fits the number curve.

[0058] Furthermore, the method for determining the curve number and the vehicle compensation curvature a2 in step S2 is as follows:

[0059] Based on the average on-site parking time of 3 minutes as T1, a curve showing the change in yarn count after loading onto the machine during the parking period was obtained. The curve's curvature compensation a2 was calculated based on the direction of change. The initial inner layer yarn count tex1, the time T2 from tex1 to the normal yarn count tex1, and the percentage change in yarn count were also obtained. Figure 2 As shown.

[0060] Furthermore, in step S3, the normal drawing machine speed is to maintain a stable yarn count (i.e., a constant linear speed), which decreases from the inside out. Therefore, to maintain a stable yarn count in the inner layer of the direct yarn after the flyback, it is assumed that the initial drawing machine speed after reloading is reduced relative to the normal drawing speed based on the change in the yarn count of the first full-boil direct yarn after the flyback, until the yarn count meets the standard and is consistent with the normal drawing speed. This improves the ability to keep the yarn count in the inner layer of the reloaded yarn within the acceptable range. The formula for compensating for the change in yarn count with the drawing machine speed is as follows:

[0061] b = 1 - tex1 / Tex (1)

[0062] Where b is the compensation ratio (%), tex1 is the initial number of the inner layer, and Tex is the normal number.

[0063] Furthermore, in step S3, the speed compensation number of the wire drawing machine includes speed compensation during the stopping process and speed compensation during the loading process.

[0064] The method for speed compensation during the parking process is as follows:

[0065] When stopping, the initial speed ω0 is compensated based on the actual stopping time t1. The compensated initial speed is ω′0, and the compensation function is as follows:

[0066]

[0067] S31: When t1≤T1, a1 can be set to take values ​​within the range (0, +∞) to make ω′0 match the actual trend of the number change, such as... Figure 3 As shown,

[0068] S32: When t1 > T1

[0069] ω′0=ω0·(1-b); (3)

[0070] Where T1 is the parking compensation time (s), a1 is the parking compensation curvature, t1 is the actual parking time, ω0 is the initial speed, and ω′0 is the initial speed after compensation.

[0071] Furthermore, the method for speed compensation during the loading process is as follows:

[0072] When getting back into the vehicle for the first time after parking, the current engine speed ω is compensated based on the ω′0 value after the shutdown compensation and the actual time t2 before getting back in the vehicle. The compensated engine speed is ω′, and the compensation function is as follows:

[0073]

[0074] S33: When t2≤T2, a2 ​​can be set to take values ​​within the range of (0, +∞) to make ω′0 match the actual trend of the number change, such as... Figure 4 As shown;

[0075] S34: When t2 > T2

[0076] ω′=ω (5)

[0077] Where ω′ is the compensated rotational speed, ω is the current rotational speed, T2 is the onboard compensation time (s), t2 is the actual onboard time, and a2 is the onboard compensation curvature.

[0078] Furthermore, the wire drawing machine program was modified, and the parameter program was set according to formulas (1)-(5). The input parameters a1, T1, a2, T2, and b were set according to the actual wire drawing and wire flying stop time and the machine loading time to realize the mechanical compensation after the wire drawing machine flies.

[0079] Furthermore, the verification method for whether the formula for the change of the wire drawing machine speed compensation number in step S4 is applicable to the actual product's wire number compensation after wire flying is as follows:

[0080] S41: After setting the operating parameters of the drawing machine, load the first full bobbin of yarn again, perform tex yarn shaving detection, and obtain the change curve, such as... Figure 5 As shown;

[0081] S42: Check the inner layer of the curve and determine whether the set parameters are valid based on the fluctuation of the inner layer number of the silk cake (normal number Tex fluctuation is within 100).

Claims

1. A method for mechanically compensating for the number of glass fiber yarns after fly shavings, characterized in that: Includes the following steps: S1: Investigate the effect of the duration of the glass fiber drawing equipment shutdown on the change of glass fiber tex after glass fiber fly, and determine whether the change in product number caused by the change in spinneret temperature after shutdown varies with the duration of time. If it varies with the duration of time, determine the shutdown compensation curvature a1 of the duration of shutdown and the number of inner layer of the fiber cake, where tex refers to the number of the fiber cake. S2: Calculate the average stopping time T1 for on-site employees, and determine the change in the number of the first yarn package after the yarn flyaway caused by the stopping time T1. Obtain the number change curve by shaving the yarn, and obtain the time of number change of the first full inner layer of the yarn flyaway from the curve. Determine the curvature a2 of the curve number change compensation on the machine. S3: Based on the curve change parameters obtained in steps S1 and S2, derive the formula for the change of the wire drawing machine speed compensation number; S4: Verify whether the formula for the change of the wire drawing machine speed compensation number is applicable to the actual product's wire number compensation after the wire fly-off; The method for determining the parking time duration and the parking compensation curvature a1 of the inner layer number of the silk cake in step S1 is as follows: An on-site investigation was conducted, and the downtime of employees operating the wire drawing equipment was selected. The first wire cake after the wire was reloaded after multiple downtimes was sampled, and the inner layer number of the wire cake was detected. A curve of the change in the length of downtime and the inner layer number of the wire cake was obtained. The downtime compensation curvature a1 was determined based on the direction of the curve. The method for determining the curve number and the on-vehicle compensation curvature a2 in step S2 is as follows: Based on the average on-site parking time of 3 minutes as T1, the curve of the yarn number change after the yarn is loaded onto the machine during the parking period is obtained. The curvature a2 of the yarn number loading compensation is calculated based on the direction of the curve change. The initial number tex1 of the inner layer and the time T2 from tex1 to the normal number Tex and the number change ratio are obtained. In step S3, the normal drawing machine speed is designed to maintain a stable yarn count (i.e., a constant linear speed), which decreases gradually from the inside out. Therefore, to maintain a stable yarn count in the inner layer of the direct yarn after the flyback, it is assumed that the initial drawing machine speed after reloading is reduced relative to the normal drawing speed based on the change in the yarn count of the first full-boiler direct yarn after the flyback, until the yarn count meets the standard and is consistent with the normal drawing speed. The formula for compensating for the change in yarn count using the drawing machine speed is as follows: b = 1 - tex1 / Tex (1) in, b The compensation ratio is %, tex1 is the initial inner number, and Tex is the normal number; In step S3, the speed compensation number of the wire drawing machine includes speed compensation during the stopping process and speed compensation during the loading process; The method for speed compensation during the parking process is as follows: When stopping, the initial speed ω0 is compensated based on the actual stopping time t1. The compensated initial speed is ω′0, and the compensation function is as follows: （2） S31: When t1≤T1, a1 can be set in... The values ​​are selected within a range to ensure that ω′0 matches the actual trend of the number change. S32: When t1 > T1 ；（3） in, T 1 represents the parking compensation time in seconds, a1 represents the parking compensation curvature, t1 represents the actual parking time, ω0 represents the initial speed, and ω′0 represents the initial speed after compensation. The method for speed compensation during the loading process is as follows: When getting back into the vehicle for the first time after parking, the current engine speed ω is compensated based on the ω′0 value after the shutdown compensation and the actual time t2 before getting back in the vehicle. The compensated engine speed is ω′, and the compensation function is as follows: （4） S33: When t2≤T2, a2 ​​can be set in... The values ​​are selected within a range to ensure that ω′0 matches the actual trend of the number change; S34: When t2 > T2 ω′=ω(5) Where ω′ is the compensated rotational speed, and ω is the current rotational speed. T 2 represents the onboard compensation time in seconds, t2 represents the actual onboard time, and a2 represents the onboard compensation curvature.

2. The method for mechanically compensating for the number of glass fiber yarns after fly filament removal according to claim 1, characterized in that: Modify the wire drawing machine program and set the parameters according to formulas (1)-(5). Also, based on the actual wire drawing and wire dropping stop time and the machine start time, set the input parameters: a1, T 1, a2, T 2.b is used to achieve mechanical compensation after the wire drawing machine loses wire.

3. The method for mechanically compensating for the number of glass fiber yarns after fly shavings, as described in claim 2, is characterized in that: The method for verifying whether the formula for the change of the wire drawing machine speed compensation number in step S4 is applicable to the actual product's wire number compensation after wire fly is as follows: S41: After setting the operating parameters of the drawing machine, load the first full bobbin of yarn again, perform tex yarn shaving test, and obtain the change curve; S42: Check the inner layer of the curve and determine whether the set parameters are effective based on the fluctuation of the inner layer number of the silk cake.

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