CN109142080B - Silk thread on-line detection device and on-line detection method - Google Patents
Silk thread on-line detection device and on-line detection method Download PDFInfo
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/16—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces applied through gearing
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Abstract
The invention provides a silk thread online detection device and an online detection method, wherein the silk thread online detection device comprises: the tension increasing and decreasing unit comprises at least one power wheel capable of providing stable driving moment or damping moment, a driving system or a damping system is arranged on each power wheel, and the two sides of the tension increasing and decreasing unit are respectively provided with an input end and an output end of a silk thread; the speed measuring device is respectively arranged at the input end and the output end and is used for directly or indirectly measuring the wire feeding speed of the wire. The on-line detection device for the silk thread provided by the invention has a simple structure, can be arranged in the silk thread processing process, realizes on-line nondestructive detection of all silk thread segments, and avoids discarding the silk thread due to detection damage.
Description
Technical Field
The invention belongs to the field of silk threads, and particularly relates to a silk thread online detection device and an online detection method.
Background
In the processing process of the silk thread, the mechanical properties of the processed silk thread are greatly fluctuated due to continuous changes of factors such as the quality, temperature, tension, stretching rate, wire feeding speed, material properties and the like of the silk thread, so that the mechanical properties of the silk thread before or after processing are required to be detected, and processing technological parameters are corrected or unqualified silk threads are removed.
At present, the mechanical property of the silk thread is detected, which is generally monitored off-line in a laboratory, one or a plurality of segments of silk thread are cut off through destructive sampling, the mechanical property of the silk thread is detected on a pulling machine and other equipment, and the quality level of the silk thread is judged through a statistical method.
The method has less sampling, is a destructive sampling, belongs to product quality post-evaluation and can not timely control the processing technological parameters of the silk thread, the detection data can only reflect the material characteristics of the sample, can not reflect the real quality of the whole silk thread product in detail, and can not be used for timely adjusting the processing parameters so that the silk thread characteristics tend to design values, and a large amount of waste products are often caused.
Disclosure of Invention
The invention provides a silk thread online detection device and an online detection method aiming at the technical problems.
In order to achieve the above purpose, the invention adopts the following technical scheme:
an on-line detection device for detecting the elastic constant of a silk thread, which is characterized by comprising:
the tension increasing and decreasing unit comprises at least one power wheel capable of providing stable driving moment or damping moment, a driving system or a damping system is arranged on each power wheel, and the two sides of the tension increasing and decreasing unit are respectively provided with an input end and an output end of a silk thread;
the speed measuring device is respectively arranged at the input end and the output end and is used for directly or indirectly measuring the wire feeding speed of the wire.
Preferably, a plurality of power wheels are provided, each provided with a separate drive system or damping system.
Preferably, the input end and the output end are respectively provided with a first guide wheel and a second guide wheel which are used for assisting in speed measurement, and the first guide wheel and the second guide wheel are driven wheels which do not provide power and can rotate under the drive of the silk thread; the speed measuring device is respectively arranged on the first guide wheel and the second guide wheel and used for measuring the wire running speed of the wire.
Preferably, the speed measuring device is a linear speed sensor or a rotation speed sensor.
A method for on-line detection of a wire, using the wire on-line detection device according to any one of the above, comprising the steps of:
the wire to be detected is input from the input end, bypasses n power wheels and is output from the output end according to the set wire running speed, wherein n is more than or equal to 1;
the tension value of the silk thread at the input end and the output end is F respectively a And F b Wherein F is a ≠F b Tension difference Δf=f between the output and input b -F a Controlling the delta F to be a constant value;
each power wheel obtains corresponding driving moment or damping moment through the driving system or the damping system arranged on the power wheel, and further provides the corresponding driving moment or damping moment for the silk thread tension decrement or tension increment, wherein the tension decrement or tension increment is collectively called as tension variable;
the tension variable of the yarn supplied by each of said power wheels numerically ensures that the yarn does not slip on said power wheels, by adjusting said driving system or said damping system so that the sum of the values of said tension variable of the yarn supplied by all power wheels is equal to the value of Δf, so as to balance the system, i.e. F 1 +f 2 +…f n =Δf, where F i A tension variable value provided to the yarn for the ith power wheel;
the speed measuring device is used for respectively and directly or indirectly measuring the wire feeding speed v of the wire at the input end a And the wire feeding speed v of the output end b Obtaining v b /v a Is a value of (2);
calculating the elastic constant k=Δf/(v) b /v a -1)。
Preferably, when the guide wheels are arranged, the wire is input by the first guide wheel arranged at the input end, bypasses one or more power wheels, and is output by the second guide wheel arranged at the output end.
Preferably, definition f i ＝Q i ×F i-1 Wherein F is i-1 For the tension value of the silk thread after passing through the ith-1 th power wheel, Q i As the correlation coefficient, when i=1, F 0 ＝F a ；
Tension variable that the ith said power wheel can provide to the filamentValue f i Has a maximum value of f imax When f i ＞f imax When the silk thread slides on the power wheel, the maximum value Q of the correlation coefficient imax ＝f imax /F i-1 The method comprises the steps of carrying out a first treatment on the surface of the To ensure that the silk thread does not slip on the power wheel, Q is taken i ＜Q imax 。
Preferably, the value of Δf is provided by a tension increasing and decreasing unit and is kept constant.
Preferably, the F a And said F b The maximum value of (2) is not greater than the designed tensile resistance of the wire, and the minimum value ensures that the static friction force between the wire and the first guide wheel or the second guide wheel is enough to drive the first guide wheel or the second guide wheel, and the wire cannot slide on the first guide wheel or the second guide wheel.
Compared with the prior art, the invention has the advantages and positive effects that:
1. the on-line detection device for the silk thread provided by the invention has a simple structure, can be arranged in the silk thread processing process, realizes on-line nondestructive detection of all silk thread segments, and avoids discarding the silk thread due to detection damage.
2. The online detection method of the silk thread provided by the invention can realize nondestructive detection of the elastic constant of the whole silk thread section of the silk thread, and basic technological parameters are determined by evaluating and screening the mechanical properties of the silk thread to obtain the silk thread product.
3. According to the on-line yarn detection device and the on-line yarn detection method, the data of the finished yarn obtained by the on-line yarn detection device and the on-line yarn detection method can correct all parameters in the processing process in time, so that the yarn product has stable mechanical properties.
Drawings
Fig. 1 is a schematic structural diagram of an on-line yarn detecting device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram II of a yarn on-line detecting device according to an embodiment of the present invention;
in the figure: 1. a power wheel; 11. a drive system or damping system; 2. a speed measuring device; 31. a first guide wheel; 32. a second guide wheel; 4. a silk thread.
Detailed Description
The present invention will be specifically described below by way of exemplary embodiments. It is to be understood that elements, structures, and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.
In the description of the present invention, it should be noted that the positional or positional relationship indicated by the terms such as "inner", "outer", "upper", "lower", "front", "rear", etc. are based on the positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The conventional detection method mostly adopts elastic modulus to measure the characteristics of the silk thread, but the elastic modulus is actually a mechanical index of materials composing the silk thread and cannot be directly used for characterizing the characteristics of the silk thread. According to hooke's law, the elongation Δl of a wire is proportional to the amplitude of variation Δf of the tension it is subjected to, inversely proportional to its elastic coefficient k, namely:
k=Δf/Δl=Δf/(l×e), wherein,
e is the stretching ratio, and the input length of the silk yarn is L in the set time t a Output length L b The input and output speeds are v a And v b Then e= (L b -L a )/L a ＝(v b t-v a t)/(v a t)＝v b /v a -1。
The k value depends on the material selected, the wire diameter, the length, the shape, etc.
The invention defines the elastic coefficient of a unit length of silk thread as the elastic constant K of the silk thread, which is used for representing the mechanical property of the unit length of silk thread, wherein the elastic constant K=delta F/(delta L/L) =k×L=delta F/e= (F) b -F a )/(v b /v a -1). The unit of K is N or kN, the same dimension as the force, S represents the cross-sectional area of the wire, and the elastic modulus e=Δfl/Δl/s=kl/s=k/S. The K value can reflect the elastic characteristics of the silk thread along the process distribution, and comprises the characteristics of elastic modulus, silk thread diameter and the like, and is directly related to the comprehensive performance of the silk thread, so that the quality and practical application of the silk thread are more favorably evaluated.
Based on the above, the embodiment of the invention provides an online detection device and an online detection method for the characteristics of a silk thread, which can realize online detection of the elastic constant of the silk thread.
As shown in fig. 1, the on-line detection device for a wire provided by the embodiment of the invention is used for on-line detection of a wire elastic constant, and includes: the tension increasing and decreasing unit comprises at least one power wheel 1 capable of providing stable driving moment or damping moment, a driving system or damping system 11 is arranged on each power wheel 1, and two sides of the tension increasing and decreasing unit are respectively provided with an input end A and an output end B of a silk thread; the speed measuring device 2 is respectively arranged at the input end A and the output end B and is used for directly or indirectly measuring the wire feeding speed of the wire.
The driving system or the damping system may be an existing device, for example, an adjustable torque damper or an adjustable torque motor, which is simply indicated by 11 in fig. 1, and the installation position is not particularly limited, and may be provided on the axle of the power wheel 1 or may be provided at a position other than the axle, as long as the driving torque or the damping torque can be provided to the power wheel 1; the number and arrangement of the power wheels 1 are not particularly limited as long as the running of the yarn can be achieved and the tension difference between the yarn input end a and the yarn output end B can be shared.
The traditional detection method is to selectively and randomly intercept a section of silk thread sample for detection, and the method damages the silk thread on one hand, so that the detection silk thread is abandoned and waste is caused; on the other hand, the detection result cannot represent the performance of the whole wire segment because of randomly intercepting a segment for detection. The on-line detection device provided by the embodiment of the invention has a simple structure, can be arranged in the processing process of the silk thread, realizes on-line nondestructive detection of the whole silk thread segment, improves the accuracy of detection results, is used for closed-loop control of processing parameters, and improves the quality of the silk thread.
As an embodiment, as shown in fig. 1, the power wheels 1 are provided in plurality, and each power wheel 1 is provided with a separate driving system or damping system 11. The drive or damping torque required for the respective power wheel 1 is provided by the drive or damping system 11, each of the power wheels 1 independently operating without interaction.
As an embodiment, as shown in fig. 2, the input end a and the output end B are respectively provided with a first guide wheel 31 and a second guide wheel 32 for assisting in speed measurement, and the first guide wheel 31 and the second guide wheel 32 are driven wheels which do not provide power and can rotate under the drive of the silk thread 4; the speed measuring device 2 is respectively arranged on the first guide wheel 31 and the second guide wheel 32 and is used for measuring the wire running speed of the wire 4.
In this embodiment, the first guide wheel 31 and the second guide wheel 32 serve as the rotating wheels for assisting in speed measurement, the first guide wheel 31 and the second guide wheel 32 are driven to rotate by the wire 4, and the wire running speed of the wire 4 is transmitted to the speed measuring device 2 in a form of rotating speed, so that the wire running speed is measured. However, it should be noted that the first guide wheel 31 and the second guide wheel 32 are not necessary for measuring the wire feeding speed, and if the wire feeding speed of the wire can be directly measured by the wire speed sensor without an auxiliary speed measuring device, no guide wheel is required to be disposed at the input end a and the output end B.
The speed measuring device 2 of the present embodiment includes a device for directly or indirectly measuring the wire feeding speed v of the input end a And output end wire speed v b For example, a linear velocity sensor, a rotational speed sensor, etc., as long as the wire feed speed ratio v of the wire feed end a or the wire feed end B can be obtained by measurement and calculation b /v a The value of (2) is sufficient.
When the speed measuring device 2 is a linear speed sensor, the measured value is the linear speed, namely the wire feeding speed v of the wire input end is measured a And the wire feeding speed of the output endDegree v b The method comprises the steps of carrying out a first treatment on the surface of the When the speed measuring device 2 selects a rotary encoder as the rotation speed sensor, the first guide wheel 31 drives the encoder to generate n pulses in the same time period a The number of pulses generated by the encoder driven by the second guide wheel is n b At this time, the wire feeding speed v of the wire input end a And output end wire speed v b The ratio of (c) is also related to the ratio of the diameters of the two guide wheels, i.e. the elastic constant k= (F) b -F a )/(v b /v a -1)＝(F b -F a )/(c×n b /n a -1), wherein c is the ratio of the diameter of the second guide wheel 32 to the diameter of the first guide wheel 31.
When the speed measuring device 2 is a rotational speed sensor, it is preferable that the diameters of the first guide wheel 1 and the second guide wheel 2 are the same or have a certain proportional relationship c. This is designed to facilitate the obtaining of the linear velocity ratio by the rotational velocity ratio calculation.
The on-line detection method for the silk thread provided by the embodiment of the invention utilizes the on-line detection device for the silk thread to detect, and comprises the following steps:
the wire 4 to be detected is input from the input end A according to the set wire running speed, and is output from the output end B after passing through n power wheels 1, wherein n is more than or equal to 1;
the tension value of the silk thread at the input end A and the output end B is F respectively a And F b Wherein F is a ≠F b Tension difference Δf=f between the output B and the input a b -F a Controlling the delta F to be a constant value;
each power wheel 1 obtains a corresponding stable driving moment or damping moment through the driving system or the damping system 11 arranged on the power wheel, and further provides a tension decrement or a tension increment for the silk thread 4, wherein the tension decrement or the tension increment are collectively called as a tension variable;
the tension variable provided by each of the power wheels 1 to the wire numerically ensures that the wire 4 does not slip on the power wheel 1, by adjusting the driving system or the damping system 11, so that all movements are madeThe sum of the values of the tension variables provided to the wire 4 by the force wheel 1 is equal to the value of Δf, so as to balance the system, i.e. F 1 +f 2 +…f n =Δf, where F i The value of the tension variable provided to the wire 4 for the ith power wheel 1;
the speed measuring device 2 is used for respectively and directly or indirectly measuring the wire feeding speed v of the wire 4 at the input end A a And the wire feeding speed v of the output end B b Obtaining v b /v a Is a value of (2);
calculating the elastic constant k=Δf/(v) b /v a -1)。
According to the online detection method provided by the embodiment of the application, the tension difference value between the input end A and the output end B is constant, and tension variable which can be balanced with the tension difference value is provided for the silk thread 4 through the power wheel 1 arranged in the middle, so that the tension of the system is balanced; in addition, by distributing proper tension variables on each power wheel 1, the wire 4 is ensured not to slip on the power wheels 1, and the accuracy of the detection result is ensured.
The online detection method can be used as a working procedure in the silk thread processing process, and realizes online nondestructive detection of the elastic constant of the silk thread in the whole process. In the processing process of the silk thread, two sets of detection devices can be arranged, so that the online nondestructive detection of the elastic constants of the raw silk before processing and the finished silk after processing is realized respectively. The mechanical property of the precursor can be evaluated to screen the precursor product, and the basic technological parameters can be determined. According to the data obtained by online detection of the finished silk yarn, the processing parameters can be corrected in time, and the phenomenon that the quality of the silk yarn exceeds a target value due to factors such as fluctuation of the quality of the silk yarn, unstable parameters, environmental change and the like is avoided, so that the silk yarn product obtained after processing has stable mechanical characteristics, and the technical problem which people want to solve all the time is solved.
As an embodiment, as shown in fig. 2, when a guide wheel is provided, the wire 4 is routed by the first guide wheel 31 provided at the input end a, bypasses one or more of the power wheels 1, and is output by the second guide wheel 32 provided at the output end B. This is mainly directed to a speed measuring device 2, such as a tachometer, which requires speed measurement by an auxiliary device. The first guide wheel 31 and the second guide wheel 32 are test wheels, which do not provide tension to the wire 4.
As a preferred embodiment, definition f i ＝Q i ×F i-1 Wherein F is i-1 For the tension value of the silk thread after passing through the ith-1 th power wheel, Q i As the correlation coefficient, when i=1, F 0 ＝F a ；
The tension variable value f that the ith said power wheel can provide to the yarn i Has a maximum value of f imax When f i ＞f imax When the silk thread slides on the power wheel, the maximum value Q of the correlation coefficient imax ＝f imax /F i-1 Can be obtained through experiments; to ensure that the silk thread does not slip on the power wheel, Q is taken i ＜Q imax 。
In the above embodiment, Q is selected i And Q imax As a measure of the tension variable value f i Whether the slippage phenomenon is generated or not is more specific. The Q is imax Can be obtained by testing the critical value of the occurrence of slipping phenomena of the wire on said power wheel.
As a preferred embodiment, the value of Δf is provided and kept constant by a tension increasing and decreasing unit.
The F is a And said F b The maximum value of (2) is not greater than the designed tensile resistance of the wire 4, and the minimum value is to ensure that the static friction force between the wire 4 and the first guide wheel 31 or the second guide wheel 32 is enough to drive the first guide wheel 31 or the second guide wheel 32, and the wire cannot slide on the first guide wheel or the second guide wheel, so that the detection result is more accurate. When the maximum value is equal to the designed tensile resistance of the silk thread 4, the method can be used for detecting the tensile capacity of the whole silk thread.
According to the elastic constant obtained above, the elastic modulus E, e=k/S can be further calculated, and compared with the traditional static force method elastic modulus test method, the measurement model has no damage to the wire and no complex additional equipment, and can be used for online whole-course measurement.
Example 1
As shown in fig. 1, the yarn to be detected is input by an input end a, wound around 5 power wheels 1, and then output by an output end B; the design tensile resistance value of the detected silk thread is F t ＝50N。
In this embodiment, 5 power wheels 1 are respectively provided with a damping system and provide stable damping moment. Under the action of a traction system (not shown in the figures), the wire runs from the input end a to the output end B, so that the value of the tension of the wire increases progressively in the direction of travel of the wire. Tension value F at the wire input is controlled by a travelling block (not shown) carrying a counterweight a 10N. In this embodiment, there are 5 power wheels 1, and each correlation coefficient Q is obtained by actual measurement data imax > 0.6, each correlation coefficient Q i The tension variables of the yarn supplied by the 5 power wheels 1 from the input end A to the output end B are respectively expressed as tension increments of 0.4 and f 1 ～f 5 The method comprises the following steps:
F a ＝10N；
f 1 ＝F a ×0.4＝4N；
f 2 ＝F 1 ×0.4＝(F a +f 1 )×0.4＝5.6N；
f 3 ＝F 2 ×0.4＝(F a +f 1 +f 2 )×0.4＝7.84N；
f 4 ＝F 3 ×0.4＝(F a +f 1 +f 2 +f 3 )×0.4＝10.98N；
f 5 ＝F 4 ×0.4＝(F a +f 1 +f 2 +f 3 +f 4 )×0.4＝15.37N；
F b ＝F a +f 1 +f 2 +f 3 +f 4 +f 5 ＝53.78N。
to facilitate the detection of the design tensile force, F b The value of (2) is 50N, and the tension variable value f can be adjusted 5 =15.37-3.78= 11.59N, so that the system is flatAnd (5) weighing.
The wire feeding speed v of the wire at the input end A is measured by a wire speed sensor a At a yarn speed v of 0.09m/s at output end B b Is 0.1m/s, and the elastic constant K= (F) of the detected silk thread is finally calculated b -F a )/(v b /v a -1) = (50-10)/(0.1/0.09-1) =360N; cross-sectional area of the detected wire s=1×10 -6 m 2 The elastic modulus e=k/s=360 MPa. The maximum tension of the silk thread is controlled at 50N, and whether the tensile capacity of the silk thread along the thread can meet the tensile design requirement can be checked.
Example 2
As shown in fig. 2, the yarn to be detected is input by the first guide wheel 31 arranged at the input end a, passes through 5 power wheels 1, is output by the second guide wheel 32 arranged at the output end B, and has a design tensile resistance value of F t ＝50N。
In this embodiment, the 5 power wheels 1 are respectively provided with a driving system and provide stable driving torque, and under the action of a traction system (not shown in the figure), the yarn runs from the input end a to the output end B, so that the tension value of the yarn decreases along the yarn travelling direction. Tension value F at the wire input is controlled by a travelling block (not shown) carrying a counterweight a 50N. In this embodiment, there are 5 power wheels 1, and each correlation coefficient Q is obtained by actual measurement data imax > 0.6, each correlation coefficient Q i Taking 0.4, the tension variables of the silk thread provided by the 5 power wheels 1 from the input end A to the output end B are expressed as tension decrement, and are respectively f 1 ～f 5 The method comprises the following steps:
F a ＝50N；
f 1 ＝F a ×0.4＝50×0.4＝20N；
f 2 ＝F 1 ×0.4＝(F a -f 1 )×0.4＝(50-20)×0.4＝12N；
f 3 ＝F 2 ×0.4＝(F a -f 1 -f 2 )×0.4＝(50-20-12)×0.4＝7.2N；
f 4 ＝F 3 ×0.4＝(F a -f 1 -f 2 -f 3 )×0.4＝(50-20-12-7.2)×0.4＝4.32N；
f 5 ＝F 4 ×0.4＝(F a -f 1 -f 2 -f 3 -f 4 )×0.4＝(50-20-12-7.2-4.32)×0.4＝2.592N；
F b ＝F a -f 1 -f 2 -f 3 -f 4 -f 5 ＝50-20-12-7.2-4.32-2.592＝3.888N。
to facilitate constant tension control, F b The value of (2) takes 4N, i.e., the tension variable value f5=2.592-4+3.888=2.48N is adjusted so that the system is balanced.
The number n of pulses generated by the rotation of the first guide wheel 31 is measured at the same time by the rotary encoders respectively provided on the first guide wheel 31 and the second guide wheel 32 1 180000 pulses n of rotation of the second guide wheel 32 2 For 179820, the diameter ratio c=1 of the second guide wheel 32 to the first guide wheel 31, and the elastic constant k= (F) of the detected yarn is finally calculated b -F a )/(v b /v a -1)＝(F b -F a )/(c×n b /n a -1) =46000N; cross-sectional area of the detected wire s=1×10 -7 m 2 The elastic modulus e=k/s=460 GPa. The maximum tension of the silk thread is controlled at 50N, and whether the tensile capacity of the silk thread along the thread can meet the requirement of tensile design can be checked.
The present invention is not limited to the above-mentioned embodiments, and any equivalent embodiments which can be changed or modified by the technical content disclosed above can be applied to other fields, but any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical substance of the present invention without departing from the technical content of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (4)
1. An on-line detection method for silk threads is characterized in that: the device comprises a wire on-line detection device, a tension increasing and decreasing unit and a speed measuring device, wherein the wire on-line detection device is used for on-line detection of the elastic constant of the wire and comprises a tension increasing and decreasing unit and a speed measuring device, the tension increasing and decreasing unit comprises at least one power wheel capable of providing stable driving moment or damping moment, a driving system or a damping system is arranged on each power wheel, the two sides of the tension increasing and decreasing unit are respectively provided with an input end and an output end of the wire, and the speed measuring device is respectively arranged at the input end and the output end and is used for directly or indirectly measuring the wire running speed of the wire; the input end and the output end are respectively provided with a first guide wheel and a second guide wheel which are used for assisting in speed measurement, and the first guide wheel and the second guide wheel are driven wheels which do not provide power and can rotate under the drive of the silk thread; the speed measuring device is respectively arranged on the first guide wheel and the second guide wheel and used for measuring the wire running speed of the wire; the wire is input by the first guide wheel arranged at the input end, bypasses one or more power wheels and is output by the second guide wheel arranged at the output end;
the wire online detection method comprises the following steps:
the wire to be detected is input from the input end, bypasses n power wheels and is output from the output end according to the set wire running speed, wherein n is more than or equal to 1;
the tension value of the silk thread at the input end and the output end is F respectively a And F b Wherein F is a ≠F b Tension difference Δf=f between the output and input b -F a Controlling Δf to be a constant value, the value of Δf being provided by the tension increasing and decreasing unit and kept constant;
each power wheel obtains corresponding driving moment or damping moment through the driving system or the damping system arranged on the power wheel, and further provides the corresponding driving moment or damping moment for the silk thread tension decrement or tension increment, wherein the tension decrement or tension increment is collectively called as tension variable;
the tension variable of the silk thread provided by each power wheel can ensure that the silk thread does not slip on the power wheel in numerical value, and the silk thread is connected with the power wheelOvershooting either the drive system or the damping system such that the sum of the tension variable values provided by all power wheels to the wire is equal to the value of Δf, to balance the system, i.e. F 1 +f 2 +…f n =Δf, where F i A tension variable value provided to the yarn for the ith power wheel; definition f i =Q i ×F i-1 Wherein F is i-1 For the tension value of the silk thread after passing through the ith-1 th power wheel, Q i As the correlation coefficient, when i=1, F 0 =F a ；
The tension variable value f that the ith said power wheel can provide to the yarn i Has a maximum value of f imax When f i ＞f imax When the silk thread slides on the power wheel, the maximum value Q of the correlation coefficient imax =f imax /F i-1 The method comprises the steps of carrying out a first treatment on the surface of the To ensure that the silk thread does not slip on the power wheel, Q is taken i ＜Q imax ；
The speed measuring device is used for respectively and directly or indirectly measuring the wire feeding speed v of the wire at the input end a And the wire feeding speed v of the output end b Obtaining v b /v a Is a value of (2);
calculating the elastic constant k=Δf/(v) b /v a -1)。
2. The wire on-line inspection method according to claim 1, wherein: the F is a And said F b The maximum value of (2) is not greater than the designed tensile resistance of the wire, and the minimum value ensures that the static friction force between the wire and the first guide wheel or the second guide wheel is enough to drive the first guide wheel or the second guide wheel, and the wire cannot slide on the first guide wheel or the second guide wheel.
3. The wire on-line inspection method according to claim 1, wherein: the power wheels are provided in plurality, and each power wheel is provided with an independent driving system or damping system.
4. The wire on-line inspection method according to claim 1, wherein: the speed measuring device is a linear speed sensor or a rotating speed sensor.
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| CN114184462A (en) * | 2021-12-14 | 2022-03-15 | 浙江伊兰文科技股份有限公司 | Tension testing device for chemical fiber filaments and using method thereof |
| CN114184461A (en) * | 2021-12-14 | 2022-03-15 | 浙江伊兰文科技股份有限公司 | Device and method for detecting colored and formed chemical fiber silk threads |
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