Mode of evaluation of a strain-deformed state of moving easily deformed materials of a grid-type structure

FIELD: the invention refers to control of the state for example of textile materials at their interaction with working parts of technological equipment.

SUBSTANCE: the essence is in scanning the surface of the moving material with the aid of the sensitive element of a piezo-converter. The average value of the current linear sizes of the structural elements are calculated according to the number of the impulses generated by a piezo-converter and defined by the quantity of the elements of the structure (for example by the number of weave units) on the reference length of the part of the moving object. Periodically the received results are compared with the corresponding starting data of the structure of the rigid part of the material.

EFFECT: increases accuracy of the evaluation of the strain-deformed state of the moving easily deformed materials of a grid-type structure with simultaneous simplification of technical realization.

2 cl, 3 dwg

 

The invention relates to methods of evaluation and monitoring of the stress-strain state (SSS) moving legkodeformiruemyh material mesh structure (for example, textile materials, plain weave, some kinds of knitted fabric) at their contact with the working bodies of the technological equipment.

A known method of controlling the magnitude of the relative elongation flat voloknistihkh materials under mechanical deformation [U.S. Pat. Of the Russian Federation No. 2082083, publ. 20.06.97], in which the study material is light parallel light beam perpendicular to its surface and record the light scattered by the material in the opposite direction in two identical bodily angles oriented in mutually perpendicular planes at equal angles to the incident beam, while one of the light fluxes register in a plane coincident with the direction of application of mechanical stress and the axis of the photodetector, and the relative elongation is judged by the magnitude of the coefficient of the optical isotropy. The disadvantage of this method is an indirect method of measuring the strain that requires technical realization of the introduction of the measuring system additional technical means, conduct special calibration operations for each of the CSO type of material, that leads to lower reliability of the system efficiency and increase the error of measurement.

There is a method of measuring the stress-strain state of a moving materials [RF patent № 2232390, publ. 10.07.04 - prototype], which determine the linear dimension of the pattern of the weave of the material in the undeformed condition, its value enables synchronization frequency strobotuner with the linear speed of the material, the observed change of frequency of the stroboscopic effect when power effect on the material and on pre-established dependence of this frequency on the tension calculate the tension of the material and determine the relative deformation.

The disadvantage of this method is the complexity of its implementation in a production environment because the method is based on an indirect method of determining the strain that requires for its implementation the introduction of the measuring system of additional structural elements, which leads to deterioration of the efficiency and reliability of the system and causes a decrease in the accuracy of determining the relative deformation and evaluation of stress-strain state.

The objective of the invention is to simplify the technical implementation of the method and improve the accuracy assessment of the stress-strain state of a moving legkodeformiruemyh material mesh structure.

The problem is solved by a method of estimating the stress-strain state of a moving legkodeformiruemyh material mesh structure, which includes the determination of the linear size of the repeat weaves and calculation on the basis of the relative deformation, which, in contrast to the known method, determine the initial average linear size of rapport weave undeformed materialthen by scanning the surface of moving material by using a piezoelectric transducer at a constant power effect sensing element of the piezoelectric transducer on the surface of the material determine the average value of the current line size rapport weave according to the number generated by the piezo pulses (n1)attributable to the preset reference length (le), and compare the current average linear size of rapport weave with its original value, while the relative deformation (ε) are calculated according to algorithm

In an optimal embodiment, the method of scanning the surface of the moving material is carried out at power effect sensing element piezometric transducer to the surface driving the I material in the range of 0.1-0.25 N.

The method is carried out with the assistance presented in figure 1 schema definition of deformation, including piezometric Converter. Figure 2 shows the conditional section of material in the undeformed condition; figure 3 is a conventional cut material in a deformed state.

The implementation of the method includes the following steps:

- previously one of the known methods (for example, in accordance with GOST № 3812-72 "textile Materials. Fabric and piece goods. Methods for determining the density of the filaments and bundles of cloth") determine the initial average linear size of rapport weavethe number of transverse elements of the structure of the material (weft threads) on gostiruemye (reference) length le(2) in the unloaded state and together with the value of leenter in the processor memory as a source of data;

- when moving the material at a certain speed using piezometric Converter scan the topography of its surface, and the Converter generates electronic pulses, the number of n1which is determined by the number of deformed weave repeats (figure 3) on a plot of length equal to the reference value leand the received data (in a specified condition read the beginning and end of the reference length) are delivered to the processor;/p>

the processor compares the entered the source and received by the scanning process data, such as average values of the source and the current linear parameter rapport weave, and the calculation based on these values the material is deformed (ε) at the site of its motion, equal to the reference length leaccording to the following formula:

whererepresents the current average linear dimension of the pattern of the weave of the moving material.

Technically, the method is implemented as follows.

When the movement of material in the measuring path, and accompanying this, the movement of the force interaction of the material with the working bodies of the technological equipment (for example, with transport and guide rollers of the control and inspection measuring machine) is the deformation of the material, which changes the linear parameters rapport weave and, accordingly, the number of parameters corresponding to the selected length.

Before the movement of the probe (sensor) 1 platismatia associated with its piezometric element 2, result in heavy contact with the surface of the moving material at a given pressure p on the given surface, and under his constant influence of Khujand which are continuous scanning of the surface topography of the material.

Each repeat of the weave (for example, scanned the weft yarn) corresponds to the electronic pulse generated by the piezometric Converter. Thus formed piezometric Converter the number of signals corresponds to the number of the structural elements of the moving material.

The form and frequency generated by petitepreteen pulses associated with the speed of the scanned surface of the material. For the studied materials sustainable effect read the number of reports weave, per reference length is observed when scanning the surface of the material moving with the speed V is not less than 0.1 m/s

It was also found experimentally that the optimum sensitivity used in the proposed method, the measuring system is provided with the values of the pressure P (force of impact), rendered sensitive element platismatia on the surface of moving material in the range from 0.1 to 0.25 N.

Generated by the piezoelectric element 2 signals platismatia increase in the unit amplification 3 and come in a computing system that includes a connection unit (microcontroller) 4 and the CPU 5. The signals from the piezoelectric element 2, reinforced block 3 can pass through the connection unit 4 in the processor 5 only with what you learn if you receive an enable signal from unit resolution 8.

To accomplish this, the material is applied with a special label 6. When reading labels 6 sensor 7 to the beginning of the reference length leand the receipt of a pulse signal with its output to the input unit resolution last 8 forms a potential signal resolution.

At the moment of interaction between a moving label 6 with the sensor 9 to the end of the reference length lea signal is generated translation unit 8 in the initial state and the passage of signals from the amplifier 3 through the connection unit 4 will be re-locked.

Thus, the processor receives a number of pulses equal to the number (nl) deformed repeats material 10 in the area between the sensors 7 and 9, the length of which corresponds as le. The number of pulses does not depend on the possible slippage of the material relative to the working bodies of technological equipment, uneven motion or stop in case of technological necessity, but only on the degree of its deformation.

The processor, in accordance with entered into its memory computational algorithm that processes the information obtained by comparing the current average values of the linear size of the repeat of the weave with the source and conducts the calculation of the relative deformation.

Thus, the technical result of the proposed method is to improve the accuracy of evaluation of the stress-strain state of a moving legkodeformiruemyh material mesh structure while simplifying the technical implementation of the method.

The obtained values of the deformation of the material can be used to calculate its tension on functional dependencies ε=f(T) and formation control of actuators of the process equipment (not shown in figure 1) to eliminate inadmissible deviations of process materials from the given modes.

1. The method of estimating the stress-strain state of a moving legkodeformiruemyh material mesh structure, which includes the determination of the linear size of the repeat weaves and calculation on the basis of the relative deformation, wherein determining the initial average linear size of rapport weave undeformed materialthen by scanning the surface of moving material by using a piezoelectric transducer at a constant power effect sensing element of the piezoelectric transducer on the surface of the material determine the average value of the current line size rapport weave the number g is priruenik the piezo pulses (n 1)attributable to the preset reference length (le), and compare the current average linear size of rapport weave with an initial value, while the relative deformation (ε) are calculated according to algorithm

2. The method according to claim 1, characterized in that the scanning surface of the moving material is carried out at power effect sensing element piezometric transducer on the surface of moving material in the range of 0.1-0.25 N.



 

Same patents:

FIELD: fabric industry, possible use during control of quality and rating of fabric being manufactured.

SUBSTANCE: device for finding and registering defects on moving fabric contains a light source, video camera, fabric movement speed indicator and light guides. Light guides are positioned linearly in front of light source, below fabric across its whole width, outputs of light guides being gathered in rectangular matrix, which together with video camera is positioned in tubule made of hermetical material. Video camera is positioned above rectangular matrix, while axis of video camera is perpendicular to plane of matrix, also video camera is connected to computer, adjusted for recognition and classification of fabric defects.

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8 dwg

FIELD: textile industry; light industry.

SUBSTANCE: method can be used in production of twisted lavsan fibers as in tailoring industry and in shoe-making industry. Method is based upon in getting dependence of minute deformation of samples of lavsan fibers with different degree of twist on degree of twist at constant stretching stress, which is equal for all the tested samples. Value of stretching stress, being the same for all the tested samples, is achieved due to application of stretching loads to samples. Weights of samples are determined while taking linear density of samples into account. Dependences of minute deformations of lavsan fibers with different degree of twist on degree of twist were received for several levels of stretching stresses, value of which stresses was chosen from diagrams of stretching of lavsan fibers. Influence of degree of twist on deformation properties of lavsan fibers was found due to comparison of coefficients of variation for any level of stretching stresses with maximal coefficient of variation. The values of working stresses effecting on fibers were chosen in such a way, at which values influence of twist onto deformation properties of fibers was completely eliminated. Fiber with lower degree of twist is recommended for operation, which results in reduced production costs comparing to cost f production of fiber with higher degree of twist.

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1 tbl, 1 att

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6 dwg, 1 tbl

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1 dwg

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3 dwg, 1 tbl

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1 cl, 9 dwg, 1 tbl, 1 ex

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1 dwg

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3 dwg

Optical programer // 2095755
The invention relates to a measuring and control technology

The invention relates to measuring technique and can be used in the measurement of deformations and stresses

Optical programer // 2077701

The invention relates to the control and measurement technology, in particular to a device for non-destructive testing (stress and strain) of structural elements (pumps , vessels and t

FIELD: the invention refers to control of the state for example of textile materials at their interaction with working parts of technological equipment.

SUBSTANCE: the essence is in scanning the surface of the moving material with the aid of the sensitive element of a piezo-converter. The average value of the current linear sizes of the structural elements are calculated according to the number of the impulses generated by a piezo-converter and defined by the quantity of the elements of the structure (for example by the number of weave units) on the reference length of the part of the moving object. Periodically the received results are compared with the corresponding starting data of the structure of the rigid part of the material.

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2 cl, 3 dwg

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1 ex, 3 tbl, 2 dwg

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1 dwg

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