CN109373705B - Method for controlling deformation instability caused by uneven heating of fabric surface - Google Patents
Method for controlling deformation instability caused by uneven heating of fabric surface Download PDFInfo
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- CN109373705B CN109373705B CN201811127691.6A CN201811127691A CN109373705B CN 109373705 B CN109373705 B CN 109373705B CN 201811127691 A CN201811127691 A CN 201811127691A CN 109373705 B CN109373705 B CN 109373705B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
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Abstract
The invention discloses a method for controlling deformation instability caused by uneven heating of the surface of a fabric, which comprises the following steps: s1, placing the capacitive sensor on the surfaces of different fabrics, so as to realize the acquisition of temperature and humidity data of the surfaces of the fabrics; s2, driving the roller by the pressure driver with the roller based on the collected temperature and humidity data to control the friction force of the beam of knitting: 1) when the water content of the fabric is lower than the fabric process parameter value, the heating degree of the surface of the fabric is higher, the pressure driver drives the rolling shaft to be separated from the surface of the fabric, and no friction is generated on the fabric; 2) when the water content of the fabric is higher than the process design parameter value, the water content of the fabric is high, the pressure driver drives the rolling shaft to pressurize the surface of the fabric, the friction force between the fabric and the weaving shaft is increased, and the surface deformation of the fabric caused by uneven heating of the fabric is avoided through adjustment of the friction force. The invention can realize the control of deformation instability caused by uneven heating of the surface of the fabric.
Description
Technical Field
The invention relates to the field of textile technology, in particular to a method for controlling deformation instability caused by uneven heating of the surface of a fabric.
Background
Under the production mode of 'multi-variety coaxial', the water content of the surfaces of different fabrics is different, and the water slip characteristics are different, so that the instability or the dropping of yarn coatings in the fabrics and the imbalance of gaps inside the fabrics are easily caused when the surfaces of the fabrics are subjected to thermal shock, and the spontaneous deformation instability of the surfaces of the fabrics is caused.
Disclosure of Invention
In order to solve the problems, the invention provides a method for controlling deformation instability caused by uneven heating of the surface of a fabric.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for controlling deformation instability caused by uneven heating of the surface of a fabric is characterized by comprising the following steps: the method comprises the following steps:
s1, placing the capacitive sensor on the surfaces of different fabrics, so as to realize the acquisition of temperature and humidity data of the surfaces of the fabrics;
s2, driving the roller by the pressure driver with the roller to control the friction force of the beam of a loom based on the collected temperature and humidity data;
1) when the water content of the fabric is lower than the fabric process parameter value, the heating degree of the surface of the fabric is higher, the pressure driver drives the rolling shaft to be separated from the surface of the fabric, and no friction is generated on the fabric;
2) when the water content of the fabric is higher than the process design parameter value, the water content of the fabric is high, the pressure driver drives the rolling shaft to pressurize the surface of the fabric, the friction force between the fabric and the weaving shaft is increased, and the surface deformation of the fabric caused by uneven heating of the fabric is avoided through adjustment of the friction force.
The invention has the following beneficial effects:
based on the adjustment of the friction force between the fabric and the beam, the adjustment of the heating of the surface of the fabric is realized, so that the deformation of the surface of the fabric caused by the uneven heating of the surface of the fabric is avoided.
Drawings
Fig. 1 shows the operating principle of the friction force measuring unit.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described in detail below with reference to examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
On the basis of analyzing the stretching and extrusion deformation instability mechanism of the fabric, a small-wave-amplitude disturbance is applied to the surfaces of all the fabrics, and whether the surfaces are unstable or not is determined by judging whether the external disturbance is expanded or attenuated along with time. To this end, we apply a perturbation r (θ, z, t) from both the warp and weft directions of the fabric surface, namely: r (theta, z, t) ═ b + (t) cos (n theta) cos (omega z), where (t) denotes the amplitude of the minor perturbation as it evolves over time and < a-r0. Meanwhile, from the disturbance represented by r (θ, z, t), the average curvature of the fabric surface can be derived and analyzed from the following two aspects.
Diffusion of body
First, assuming that the surface topography of the fabric is dominated by bulk diffusion, the void concentration within the different fabrics is defined and the distribution of void concentration is described by the Laplace equation. The flow J of the fabric voids moving in the radial direction according to Fick's law, which is the law of dealing with various diffusion mass transfer processesiThe following relationship is satisfied:
In the above formula, DiIs the diffusion coefficient. The continuous conditions of flow and void concentration at the interface r ═ a are: j. the design is a square1(t)＝J2(t)＝J3(t)，c1(t)＝c2(t)＝c3(t), then the evolution of the fabric surface deformation follows the following equation:
On the basis, the void concentration of the fabric satisfies the Gibbs-Thomson equation (an equation for calculating the critical nucleus radius), and the boundary condition and the continuous condition of the deformation of the surfaces of different fabrics are considered, and assuming that the void flow between the fabrics is zero, the undetermined constant in the general solution by the Laplace equation can be determined, and the void concentration distribution in different fabrics can be determined. At the same time, from the void concentration distribution and JiAnd the evolution equation of the instability of the fabric surface can be obtained. Further, the disturbance amount r (θ, z, t) is integrated to obtain a disturbance amplitude expression as shown below.
In the above formula0For the initial amplitude of the disturbance, τvIs an important judgment parameter, which is mainly used for judging whether the surfaces of different fabrics are unstable or not. If tauvIf the disturbance amplitude exponentially increases along with the time, determining that the surface of the fabric is unstable; if tauvIf the disturbance amplitude becomes exponential decay with time, the stability of the fabric surface is judged. And the critical condition is defined byvIs defined as 0.
Surface diffusion
According to a grade under-shaft warp tension mechanical model[24]Then the normal speed of the fabric surface evolution is expressed as:
in the formula DsIs the surface diffusion coefficient, ΩsVolume of atoms in the fabric, p0Is the number of atoms per unit area, Δ, on the surface of the fabricsIs the surface laplacian.
Because surface diffusion occurs only at the fabric surface, diffusion is dependent on surface curvature regardless of the yarn structure within the fabric, without taking into account the effects of stress fields. Therefore, the average curvature of the fabric surface is substituted into a normal speed calculation formula of fabric surface evolution to obtain:
therefore, the evolution law of the disturbance amplitude is obtained through the formula, namely:
Also, τsAs an important judgment parameter, it is mainly used to judge whether different fabric surfaces are unstable or not. If tausIf the disturbance amplitude exponentially increases along with the time, determining that the surface of the fabric is unstable; if tausIf the disturbance amplitude becomes exponential decay with time, the stability of the fabric surface is judged. Critical condition is defined bysIs defined as 0.
Thus, a specific control method is formed as follows: controlling the friction force of a loom beam by driving a roller through a pressure driver with the roller by the temperature and humidity change of the surface of the fabric; the method specifically comprises the following steps:
s1, placing the capacitive sensor on the surface of different fabrics, enabling moisture on the surface of the fabric to enter air holes of the sensor, causing the change of dielectric constant in the sensor, causing the change of capacitance value, namely the change of temperature and humidity on the surface of the fabric, causing the change of capacitance value, and utilizing the electro-physical characteristic to realize the acquisition of temperature and humidity data on the surface of the fabric;
and S2, driving the roller by the pressure driver with the roller based on the collected temperature and humidity data to control the friction force of the beam.
1) When the water content of the fabric is lower than the fabric process parameter value (set in a microprocessor through a software interface), the heating degree of the fabric surface is high, the pressure driver drives the roller to separate from the fabric surface, and no friction is generated on the fabric;
2) when the water content of the fabric is higher than a process design parameter value, the water content of the fabric is high, and when the water content of the fabric is increased to a certain degree, the internal gaps of the fabric are completely occupied by water molecules, and the excessive water molecules after moisture absorption of the fabric can only be adsorbed on the surface of the fabric to form a layer of water film, so that the water film enables the fabric to be easy to slide in the weaving process, and the more the excessive water molecules, the more the water slide phenomenon on the surface of the fabric is obvious. Therefore, the roller is driven by the pressure driver to pressurize the surface of the fabric, so that the friction force between the fabric and the beam is increased, and the deformation of the surface of the fabric caused by uneven heating of the fabric is avoided by adjusting the friction force.
The control algorithm of this embodiment is as follows:
in fig. 1, N is the pressure of the object on the surface of the driving shaft, α is the included angle between the horizontal plane and the axial plane, F is the component force of the gravity of the object along the inclined plane, and according to the friction theory, if mf is the friction coefficient between the fabric and the roller of the driver, the following relationship exists:
when the beam is running, F equals the friction, and when α is 0, the fabric rotates with the beam1Is the friction between the fabric and the beam, F2For the grip of the actuator roller on the fabric, mf is the coefficient of sliding friction, the following relationship exists:
F＝F1+F2and F is1＝N*mf
And F2Is the fabric surface stretching accelerated motion, F exists2Where a is the acceleration of the fabric motion and G is the acceleration of gravity, and ma is G/(ga), will
Substitution into F2To obtain
Meanwhile, according to the friction law of the fabric on the roller of the driver, L is 1/2at2Where L is the sliding distance and t is the sliding time, and substituting it into F2Obtaining: f2＝(N/cosθ*g)*2L/t2. Namely: n × mf ═ N × tg θ - (N/cos θ g) × 2L/t2If so, mf is tg θ -2L/g t2*cosθ。
By the above formula, the change law of the friction coefficient mf between the fabric and the roller of the driver can be obtained.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (1)
1. A method for controlling deformation instability caused by uneven heating of the surface of a fabric is characterized by comprising the following steps: the method comprises the following steps:
s1, placing the capacitive sensor on the surfaces of different fabrics, so as to realize the acquisition of temperature and humidity data of the surfaces of the fabrics;
s2, driving the roller by the pressure driver with the roller to control the friction force of the beam of a loom based on the collected temperature and humidity data; specifically, the method comprises the following steps:
1) when the water content of the fabric is lower than the fabric process parameter value, the heating degree of the surface of the fabric is higher, the pressure driver drives the rolling shaft to be separated from the surface of the fabric, and no friction is generated on the fabric;
2) when the water content of the fabric is higher than the process design parameter value, the water content of the fabric is high, the pressure driver drives the rolling shaft to pressurize the surface of the fabric, the friction force between the fabric and the weaving shaft is increased, and the surface deformation of the fabric caused by uneven heating of the fabric is avoided through adjustment of the friction force.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811127691.6A CN109373705B (en) | 2018-09-20 | 2018-09-20 | Method for controlling deformation instability caused by uneven heating of fabric surface |
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| CN113702215B (en) * | 2021-09-09 | 2024-02-27 | 北京理工大学重庆创新中心 | Flexible fabric impact test system and yarn strain energy calculation method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103954111A (en) * | 2014-04-18 | 2014-07-30 | 吴江市科时达纺织有限公司 | Fabric dryer |
| CN104279848A (en) * | 2014-09-30 | 2015-01-14 | 张家港市华益纺织有限公司 | Gauze drying box |
| CN106757941A (en) * | 2017-01-04 | 2017-05-31 | 江苏海大纺织机械股份有限公司 | A kind of efficient baking oven of framing shaping machine Intelligent Measurement adjustable type |
| CN107345755A (en) * | 2016-05-04 | 2017-11-14 | 蒋满珍 | Weaving drying unit |
| CN207407623U (en) * | 2017-09-03 | 2018-05-25 | 盐城市峻珑纱线有限公司 | A kind of weaving heating unit |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103954111A (en) * | 2014-04-18 | 2014-07-30 | 吴江市科时达纺织有限公司 | Fabric dryer |
| CN104279848A (en) * | 2014-09-30 | 2015-01-14 | 张家港市华益纺织有限公司 | Gauze drying box |
| CN107345755A (en) * | 2016-05-04 | 2017-11-14 | 蒋满珍 | Weaving drying unit |
| CN106757941A (en) * | 2017-01-04 | 2017-05-31 | 江苏海大纺织机械股份有限公司 | A kind of efficient baking oven of framing shaping machine Intelligent Measurement adjustable type |
| CN207407623U (en) * | 2017-09-03 | 2018-05-25 | 盐城市峻珑纱线有限公司 | A kind of weaving heating unit |
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