CN100580452C - Method and device for combined optical and mechanical measurement of yarn or fabric surface characteristics - Google Patents

Abstract

The invention relates to an optical and mechanical combined measurement method and device for surface hairiness, apparent thickness, compression performance and friction performance of yarn or fabric. The method is to hold up the sample by the guide roller and pull the sample by the roller, and use a high-resolution digital CCD camera to dynamically capture the shape of the hairiness on the surface of the sample and obtain the number of hairiness; by driving the compression block to compress the sample held up by the guide roller, Measure the apparent thickness of the sample; measure the compression performance and compression resilience of the sample by driving the compression rod to vertically reciprocate and compress the sample on the support block; measure the friction performance of the sample by pulling the sample horizontally through the roller. The device for realizing the method is composed of a bottom plate, an object stage, a positioning rod, a guide roller, a compression block, a pair of front rollers, a pressing block, a support block, a pair of rear rollers, a sample bucket, and a high-resolution digital CCD camera. , the force sensor respectively connected with the compression block, the pressing block and the support block, the roller traction mechanism, the displacement driving mechanism, the force and shape signal acquisition, control and processing system and computer. Its characteristic is that the measurement is a combined in-situ measurement of optics and mechanics, and the mechanism is exquisite, and the measurement is simple and fast.

Description

Method and device for combined optical and mechanical measurement of yarn or fabric surface characteristics

Technical field:

The invention belongs to the technical field of textile precision measuring instruments, and relates to an optical and mechanical combined measurement method and device for the surface characteristics of yarns, ropes and fabrics, and is applicable to the evaluation of weavable and processable performance of yarns, and the bulkiness, gloss and texture of fabrics. Research and measurement of performance evaluation, etc.

technical background:

The quantity and distribution of hairiness on the surface of the yarn, the compression performance and the friction performance of the yarn not only affect the processing performance of the fabric during forming, such as warp and weft stoppage, unclear weaving opening, weaving efficiency, production rate, product weaving defects and subsequent processes The quality of dyeing and dyeing, but also affect the quality of the fabric, appearance, wearing comfort and other performance. Therefore, it is of great practical significance to measure, analyze and quantitatively characterize the surface hairiness, compressive properties and frictional properties of yarns and fabrics.

At present, domestic and foreign instruments for measuring the above performance mainly use single-machine single-measurement indicators, such as yarn hairiness tester: Zweigle G 565 Hairiness Meter (A.Barella, A.Egio, L.Castro, and J.M.Gelabert.Textile Res. J., 1989, 59, 711), the instrument gives the frequency spectrum and hairiness index of 12 levels of hairiness; Uster Tester 3 (Zellweger Uster AG.'Measurement of YarnHairiness'(TE 460), Zellweger Uster AG, Uster , Switzerland, 1984), the tester uses the light diffraction and transmission of hairiness to carry out photosensitive measurement, but it is not applicable to the measurement of hairiness after light-absorbing dye finishing; Shirley Yarn Hairiness Tester (Shirley Developments Ltd.Catalogue, 1989, pp.44 , 46) and the domestic YG-172 yarn hairiness tester, before the yarn surface hairiness is taken up, the hairiness has been compressed by the roller and has fallen down, so there is a certain deviation in the result. Yarn friction tester has TwistFriction Method (ASTM.D 3412-95, Standard Test Method for Coefficient ofFriction, Yarn-to-Yarn, in Annual Book of ASTM Standards, American Society forTesting and Materials, Philadelphia, PA, USA.1995) and Zweigle G 532-Meter, etc.; Yarn Compression Measuring Instrument (Sun Jianpeng, Zhang Ling. Development of Yarn Transverse Compression Performance Tester. Journal of Tianjin Institute of Textile Engineering, 1992, 11(3), 42-46); Fabric Friction Measurement There are KES-FB4 surface performance tester and YG-821 style tester; fabric compression tester includes KES-FB3 compression tester, FAST-1 compression tester and YG-821 style tester, etc.

The above-mentioned experimental instruments and methods are only used to measure a single index. It is a traditional single-machine single-measurement single-index or multi-machine multi-measurement multi-index measurement. It is impossible to complete the measurement of yarn and fabric on the same instrument, or complete yarn or fabric. All measurements of surface hairiness, compressive properties and frictional properties. However, in practice, these properties need to be used and measured at the same time, so as to facilitate the research and analysis of various mechanical properties between yarns and fabrics.

Therefore, it is necessary to research and develop a combined measurement method and device that can analyze the hairiness, friction and compression properties of yarn and fabric surface on the same machine from both practical and theoretical research. Such a device can not only reduce the cost of the instrument, reduce the number of experimental samples used and the number of times to replace the measurement unit or device, thereby improving the efficiency of the experiment, but also implement the same single measurement, avoid sample change and operation errors, and improve the accuracy and accuracy of the measurement. stability, enabling combined in situ measurement and characterization of yarn or fabric surface characteristics and properties.

Invention content:

The object of the present invention is to provide an optical and mechanical combination measurement method and device for yarn and fabric surface characteristics, which can perform optical and mechanical combination of surface hairiness, apparent thickness, compression performance and friction performance of yarn, rope and fabric in situ measurement.

The measurement principle of the present invention is to hold up the sample by the guide roller and pull the sample by the roller, and use a high-resolution digital CCD camera to dynamically capture the shape of the hairiness on the surface of the sample and obtain the amount of hairiness; Sample, measure the apparent thickness of the sample; drive the pressure block to reciprocate and compress the sample on the support block in the vertical direction, measure the compression performance and compression resilience of the sample; pull the sample to move horizontally, and measure the friction performance of the sample , and give the mechanical behavior characteristics of the sample.

The measuring device of the present invention mainly includes force measuring mechanism, roller traction mechanism, optical measuring mechanism, displacement driving mechanism, force and shape signal acquisition, each mechanism driving and control module, program software and computer. Its basic structure and principle are:

a. The force measurement mechanism is mainly composed of three high-precision force sensors with different ranges, compression blocks, pressure blocks, and support blocks to complete the measurement of the apparent thickness, surface friction, and compression mechanical properties of yarns and fabrics. The mechanical measurement range is 0 ~500g and 0~100g; the accuracy is 0.02%. The force sensor is respectively connected with the compression block, the briquetting block and the support block, all fixed through the bottom plate; the force value signal is transmitted to the A/D data acquisition card to complete the micro force measurement;

b. The roller traction mechanism includes a pair of front rollers and a pair of rear rollers, a pair of transmission gears, a pair of movable sliders, and a sample cylinder. A pair of front rollers and a pair of rear rollers are driven by a stepping motor to jointly pull the sample; the sample is pulled by the rollers and moved on the yarn guide roller to realize the optical measurement mechanism to continuously capture the surface morphology of the sample along the length direction; the slider can be moved It is used to adjust the horizontal distance between a pair of front rollers and a pair of rear rollers; the sample container is used to load samples;

c. The optical measurement mechanism is composed of a high-resolution digital CCD camera, which can complete the surface morphology of the cross-section at any position in the length direction of the sample, and input it into the computer through the image acquisition card, and obtain the set length through computer image processing and judgment. Surface hairiness quantity, hairiness total length, hairiness index, etc.;

d. The displacement drive mechanism includes the displacement mechanism of the compression block, the pressure block, the support block and the roller mechanism: that is, the vertical movement of the compression block, the vertical movement of the pressure block and the support block, and the horizontal movement of a pair of front rollers and a pair of rear rollers. mobile agency. Each set of mechanisms is composed of a screw mechanism and a stepping motor, which are installed on the bottom plate to complete the general displacement and precision displacement of the displacement mechanism. The control of the stepping motor is composed of a computer program, and the horizontal movement of the slider is completed by turning the crank manually;

e. The signal acquisition and input system consists of an analog/digital conversion card and an image acquisition card. The analog/digital conversion card is used to convert the analog signal sensed by the force sensor into a digital signal; the image acquisition card is used to collect the shape of hairiness on the surface of the sample, and can capture images with high speed, high magnification and optical zoom. Both the analog/digital conversion card and the image acquisition card are connected with the computer to complete the data preprocessing and input into the computer;

f. The drive and control modules of each mechanism include displacement modules and rotation modules, that is, the horizontal and vertical movement modules of the compression assembly mechanism, and the movement and rotation modules of the roller traction mechanism. It is composed of digital/analog conversion card, voltage/frequency converter, drive circuit and stepping motor to complete mechanism operation and data acquisition and input in friction and compression modes;

g. Program software and computer system are composed of data acquisition and processing module, image acquisition and processing module, operation mode and control module, interface operation and parameter setting module, and basic functional modules of calculation control, processing and analysis. It can complete force and shape image acquisition and processing, real-time display and storage, interface operation program control, measurement setting and mode selection, and can obtain hairiness quantity-displacement curve, hairiness index-displacement curve, pressure-displacement curve and friction force-displacement curve and Extraction and calculation of mechanical characteristic parameters including apparent thickness, static friction coefficient, average dynamic friction coefficient, compression linearity, compression work, compression rebound rate and compression work recovery rate.

The present invention is achieved through the following technical solutions: the optical and mechanical combination measurement method and device of yarn and fabric surface characteristics, as shown in Figure 1, comprising a base plate assembly, a compression assembly mechanism, a rotation and horizontal movement assembly mechanism, and a force sensor Mechanism 7 and optical measurement mechanism, as well as the corresponding force and shape image signal processing system and displacement drive and rotation drive control system. The realization of the above measuring method is accomplished by its measuring device, the composition and function of the measuring device are as follows:

a. The bottom plate assembly is composed of bottom plate 11, stage 12 and positioning rod 13. The compression assembly mechanism, rotation and horizontal movement assembly mechanism and optical measurement mechanism are fixed through the bottom plate 11; for yarn or rope samples, it can be positioned by The rod 13 is directly fixed; or loosely placed on the stage 12 with flat samples such as fabrics, so as to facilitate the non-destructive traction of the sample. Its structure is shown in Figure 1.

b. The compression component mechanism is an apparent thickness measurement mechanism composed of a vertical movement component mechanism of the support block and a vertical movement component mechanism of the pressure block, which constitute a compression behavior measurement mechanism, and a vertical movement component mechanism of the compression block. The vertical moving assembly mechanism of the support block is composed of a stepper motor 21, a worm screw 22, a worm wheel 23, a screw rod 24, a grip bar 25, a screw 26 and a support block 27. The holding rod 25 and the support block 27 move vertically, so that the sample can be touched, and the positioning and stretching of the sample are carried out; The holding rod 55, the screw 56 and the pressing block 57 are composed of the screw rod 54 driven by the stepping motor 51 to move the holding rod 55 and the pressing block 57 to move vertically. The compression performance and compression rebound performance of the sample; the vertical moving component mechanism of the compression block is composed of a stepper motor 61, a worm screw 62, a worm wheel 63, a screw rod 64, a grip rod 65, a screw 66, a compression block 67 and a yarn guide Composed of rollers 68, the stepping motor 61 rotates the screw 64 to drive the holding rod 65, the screw 66 and the compression block 67 to move vertically, which can compress the sample vertically or cyclically, and measure the apparent thickness and compression resistance of the sample , whose structure is shown in Figure 1.

c. The rotation and horizontal movement assembly mechanism is composed of the front roller rotation mechanism mounted on the horizontal movement assembly mechanism and the rear roller rotation mechanism mounted on the horizontal movement assembly mechanism. Described horizontal moving assembly mechanism is made of stepping motor 31, worm screw 32, worm wheel 33, transmission gear 34, sample container 35, rotating crank 36, screw rod 37, slide block 38 and a pair of front rollers 39, through stepping motor 31 drives the transmission gear 34 to rotate the front roller 39 to draw yarn or fabric to the sample cylinder 35 from the positioning rod 13; rotate the crank 36 to turn the screw rod 37 to drive the slider 38 to move in the horizontal direction, and complete a pair of front rollers 39 horizontal orientation. Described horizontal moving assembly mechanism is made of stepper motor 41, worm screw 42, worm wheel 43, transmission gear 44, rotating crank 45, screw rod 46, slide block 47 and a pair of back roller 48, drives transmission gear 44 by stepper motor 41 Rotate the back roller 48 to pull the yarn or fabric from the positioning rod 13, drive the slide block 47 and a pair of back rollers 48 to move in the horizontal direction by turning the crank 45 to rotate the screw rod 46, and complete the positioning of the pair of back rollers 48 in the horizontal direction. Schematic shown in Figure 1.

d. The force sensor mechanism is characterized by high-precision force sensors 71, 72 and 73, which are respectively connected to the support block 27, the pressure block 57 and the compression block 67 to sense the force and realize the mechanical value measurement under the compression performance of the sample.

e, the optical measuring mechanism is made up of rotating crank 81, screw rod 82, holding rod 83 and high-resolution digital CCD camera 84, and the holding rod 83 and high-resolution digital CCD camera 84 are driven by rotating crank 81 and rotating screw rod 82 Move in the horizontal direction to complete the focusing and magnification of the high-resolution digital CCD camera 84. The high-resolution digital CCD camera 84 is connected to the computer through a high-speed image acquisition card, which can read the image of the sample on the guide roller 68 at a high speed and in real time. Surface hairiness morphology.

The combination of optical and mechanical measurement methods to realize the surface characteristics of yarns and fabrics is accomplished through the following specific processes:

a. Turn screw rods 37 and 46 to drive sliders 38 and 47, a pair of front rollers 39 and a pair of rear rollers 48 to a set horizontal position by turning cranks 36 and 45, respectively, to complete the positioning of the horizontal distance of the jaws; Stepping motor 21 rotates screw rod 24 to drive grip bar 25 and support block 27 to move vertically to the set height; then turn the screw rod 82 to drive grip bar 83 and high-resolution digital CCD camera 84 to the set level by turning crank 81 The direction position completes the horizontal direction focusing and zooming-in positioning of the high-resolution digital CCD camera 84 .

b. The bobbin can be directly placed on the positioning rod 13, or the yarn can be loosely placed on the stage 12; the fabric needs to be cut into a certain length × width and placed horizontally on the stage 12; then the sample (Yarn, rope or fabric, etc.) are placed along the guide roller 68, the rear roller 48 jaws, the rear roller 48 pulls the sample to the front roller 39 jaws by the stepper motor 41 rotation, and then the front roller 39 is rotated by the stepper motor 31. The roller 39 draws the sample to the sample cylinder 35.

c. Start the high-resolution digital CCD camera 84 to capture the surface morphology of the sample on the guide roller 68 within a set period of time, thereby obtaining hairiness quantity-displacement curves, hairiness index-displacement curves, etc.

d. drive the stepper motor 61 to rotate the screw rod 64 by the drive circuit to drive the holding rod 65 and the compression block 67 to move down vertically to compress the sample held up on the guide roller 68, and the compression block 67 passes through the screw 66 (the compression block 67 can also be used) Three-dimensional shapes such as cylinders or cuboids are used, and then fixed by screws 66) and connected to the sensor 73. The sensor 73 senses the force, thereby obtaining the pressure-displacement curve and its apparent thickness.

e. drive the stepper motor 51 to rotate the screw rod 54 by the drive circuit to drive the holding rod 55 and the pressing block 57 to compress the sample held up on the support block 27 once or multiple times, and the pressing block 57 is fixed by the screw 56 (the pressing block 57 is also It can be replaced with a three-dimensional shape such as a cylinder or a cuboid, and then fixed by screws 56) and connected to the sensor 72. The sensor 72 senses the force to obtain the pressure-displacement curve, compression linearity, compression work, compression rebound rate and compression work. Response rate and other characteristic values.

f. The driving circuit drives the stepping motor 51 to rotate the screw rod 54 to drive the gripping rod 55 and the pressing block 57 to compress the sample on the support block 27 vertically downward until the set pressure value stops moving; then the driving circuit drives the stepping motor 31 and 41 respectively drive the front roller 39 and the rear roller 48 to rotate and pull the sample from the positioning rod 13, the guide roller 68, between the jaws of the rear roller 48, between the support block 27 and the pressing block 57, and between the jaws of the front roller 39 to Hold the sample barrel 35; When the sample is pulled by the front roller 39, due to the positive pressure effect of the pressure block 57 and the support block 27, the friction between the sample and the pressure block 57 and the support block 27 must be overcome, and the support block 27 is connected with the screw 26. The force sensor 71 is connected, and the sensor 71 senses the force, thereby obtaining the friction force of the sample under the normal pressure, and the force sensor 71 senses the force, thereby obtaining the characteristic values such as the friction force-normal pressure curve, the coefficient of static friction and the coefficient of dynamic friction , the structure and basic principles of each mechanism are shown in Figure 1.

The control of the whole device, data acquisition and processing, interface operation and setting are completed by computer and various software modules, and the software modules are composed of data acquisition and processing module, image acquisition and processing module, operation mode and control module, interface operation and parameters The configuration module is composed of basic functional modules of calculation control, processing and analysis, and its system flow chart is shown in Figure 2.

Compared with the prior art, the present invention includes the following advantages:

a. The present invention can realize the image capture of the surface morphology of the sample under the condition of dynamic traction through the optical measurement mechanism;

b. The present invention can evaluate the surface hairiness and apparent deformation of the sample through the micro-force measuring mechanism;

c. The present invention can realize the measurement of the thickness of the sample at different positions and under different pressures, as well as the measurement of the compression relaxation behavior and resilience of the sample;

d. The present invention can integrate the static and dynamic friction performance tests of yarn and fabric, and the whole measurement is automatic, real-time, intelligent and high-precision, and the instrument mechanism is simple, the structure is exquisite, and the operation is easy.

It can be widely used in comprehensive in-situ analysis of surface hairiness, apparent thickness, compression performance and friction performance of yarns, ropes and fabrics, especially the evaluation of yarn weavability and fabric style.

Description of drawings:

Figure 1 Front view of the combined optical and mechanical measurement device for yarn and fabric surface characteristics

Fig.2 Yarn hairiness index-displacement curve

Figure 3 Fabric compression force-displacement curve

Figure 4 Fabric dynamic friction coefficient-displacement curve

Figure 5 Flowchart of data acquisition and numerical control system of optical and mechanical combined measurement device for yarn and fabric surface characteristics

In the figure: 11-base plate, 12-stage, 13-positioning rod; 21-stepper motor, 22-worm, 23-worm gear, 24-screw, 25-holding rod, 26-screw, 27-support block ;31-stepping motor, 32-worm, 33-worm gear, 34-transmission gear, 35-sample bucket, 36-turning crank, 37-screw, 38-slider, 39-front roller; 41-stepping motor , 42-worm, 43-worm gear, 44-transmission gear, 45-turning crank, 46-screw, 47-slider, 48-back roller; 51-stepper motor, 52-worm, 53-worm, 54-screw , 55-holding rod, 56-screw, 57-pressing block; 61-stepping motor, 62-worm, 63-worm gear, 64-screw, 65-holding rod, 66-screw, 67-compressing block, 68 - guide roller; 71 - force sensor, 72 - pressure sensor, 73 - pressure sensor; 81 - turning crank, 82 - screw rod, 83 - holding rod, 84 - high resolution digital CCD camera.

Detailed ways:

The following basic embodiments and examples help to understand the present invention, but do not limit the content of the present invention.

The front view of the device of the present invention is shown in FIG. 1 , and the data acquisition and numerical control system flow of the device is shown in FIG. 5 .

According to the measurement requirements, by turning the cranks (36 and 45) to turn the screw rods (37 and 46) to drive the sliders (38 and 47) and a pair of front rollers 39 and a pair of rear rollers 48 to the set horizontal position respectively, the tongs are completed. Horizontal distance positioning; then the stepper motor 21 rotates the screw rod 24 to drive the grip rod 25 and the support block 27 to move vertically to the set height; and then rotates the screw rod 82 to drive the grip rod 83 by turning the crank 81 to make the high-resolution digital CCD The horizontal direction positioning of the high-resolution digital CCD camera 84 is completed by the camera 84 to a suitable magnification and clear focus position. The fabric is cut into a certain length × wide fabric and placed loosely on the stage 12; the bobbins (or samples such as ropes) are directly placed on the positioning rod 13, or loosely placed on the stage 12; The sample (yarn, rope or fabric, etc.) is placed along the guide roller 68 and the jaws of the rear roller 48, and the rear roller 48 is rotated by the stepping motor 41 to pull the sample to the jaws of the front roller 39, and then the stepping motor 31 is controlled. Rotate the front roller 39 to draw the sample to the sample cylinder 35.

Embodiment 1, hairiness index-displacement curve obtains

According to the measurement requirements and perform the above measurement preparation steps, fix the bobbin on the positioning rod 13, then pull the yarn along the guide roller 68 to the nip of the back roller 48, drive the back roller 48 to rotate and pull the yarn through the stepping motor 41 To the front roller 39 jaws, the stepper motor 31 drives the front roller 39 to rotate and draw the yarn to the sample bucket 35. Start the high-resolution digital CCD camera 84 to capture the surface morphology of the sample on the guide roller 68 within a set period of time, thereby obtaining the hairiness index-displacement curve as shown in FIG. 2 .

Embodiment 2, apparent thickness parameter obtains

According to the measurement requirements, the fabric sample cut to a certain length and width is loosely placed on the positioning rod 13, and then the fabric is pulled along the guide roller 68 to the nip of the back roller 48, and the back roller 48 is driven by the stepping motor 41 to rotate and pull the fabric to At the front roller 39 jaws, the stepper motor 31 drives the front roller 39 to rotate and draw the fabric to the sample bucket 35. The driving circuit drives the stepper motor 61 to rotate the screw rod 64 to drive the grip rod 65 and the compression block 67 to move down vertically to compress the surface of the sample on the guide roller 68, and the pressure is induced by the force sensor 73 connected to the compression block 67, Thus, the pressure-displacement curve and the sample thickness-pressure curve are obtained. According to the sample thickness (H1, H2) measured under the action of two set pressures (N1, N2), the apparent thickness T of the sample is obtained. The results are shown in Table 1 below.

Table 1 Sample Apparent Thickness Measurement Data

Embodiment 3, pressure-displacement curve and parameter acquisition

According to the measurement requirements, cut the fabric sample of certain length * width, after the test procedure of embodiment 2 is completed, the driving circuit drives the stepper motor 51 to rotate the screw rod 54 to drive the grip bar 55 and the briquetting block 57 to compress the sample in a cycle (cycle The number of times can be set, and this embodiment only does one cycle), and the pressure-displacement curve is obtained as shown in Figure 3, and the corresponding mechanical characteristic parameters can be obtained according to the pressure-displacement curve.

Embodiment 4, kinetic friction coefficient-displacement curve and parameter acquisition

According to the measurement requirements, cut a fabric sample with a certain length × width, and after the test steps of Embodiment 2 and Embodiment 3 are completed, the drive circuit drives the stepper motor 51 to rotate the screw rod 54 to drive the holding rod 55 and the pressing block 57 to be vertical Compress the sample held up on the support block 27 downward until it stops moving under the set pressure value; then the stepper motors (31 and 41) are driven by the drive circuit to drive the front roller 39 and the rear roller 48 to rotate and pull the sample from the positioning rod 13. The guide roller 68, between the jaws of the back roller 48, between the support block 27 and the pressure block 57, and between the jaws of the front roller 39 to the sample bucket 35, thereby obtaining the frictional force of the sample under the positive pressure, Obtain the friction force-normal pressure curve (see Figure 4) and characteristic values such as the coefficient of static friction and the coefficient of dynamic friction.

Claims (9)

1, the optics of the surface hairiness of a kind of yarn or fabric, apparent thickness, compression performance and frictional behaviour and mechanics combination in-situ measuring method, this method is to hold up and roller traction sample by cord roller, uses the digital vedio recording device dynamically to absorb the surface hairiness form and the acquisition hairiness number of sample; By the sample that holds up on the drive compression piece compression cord roller, measure the apparent thickness of sample; Drive the sample of briquetting vertical direction on the compound compression back-up block, measurement sample compression performance and compression resilience; Roller horizontal direction traction sample, the frictional behaviour of measurement sample;

Described cord roller holds up and the roller traction is to rotate by the step motor drive roller, and then traction yarn or fabric move along the cord roller surface, re-use the surface hairiness form that the digital CCD image pick-up device picked-up of high resolving power is positioned at sample on the cord roller, and along with sample constantly moves on cord roller, record the surface hairiness form of optional position on the specimen length direction, then, adopt digital image processing techniques and Computing to obtain the surface hairiness quantity of specimen length direction optional position;

Described compression blocks compression cord roller is to move straight down by the step motor drive compression blocks, forms the sample apparent thickness with cord roller and measures compressing mechanism compression sample, measures the apparent thickness of sample and the anti-compression properties of surface hairiness thereof;

Described vertical direction is meant toward compound compression and moves to consistently with front roller and rear roller jaw place horizontal level by the step motor drive back-up block straight up, the sample horizontal is placed on the back-up block; Drive briquetting again and move compression performance and the compression recovery performance of forming sample compression performance measuring mechanism measurement sample with back-up block straight down;

Described horizontal direction traction is under the condition that sample is compressed with normal pressure by briquetting and the back-up block that overcomes horizontal direction friction force, rotates the traction sample by a pair of front roller of step motor drive and a pair of rear roller, measures the frictional behaviour of sample;

Described measuring method is to measure surface hairiness, apparent thickness, compression performance and the frictional behaviour of yarn and fabric; Wherein surface hairiness is meant the filoplume photosensitive area of hairiness number, filoplume total length, hairiness index and institute's pickup image middle distance sample center line preseting length of preseting length; Apparent thickness is meant the difference of institute's test specimens thickness under two set pressure effects; Compression performance is meant the anti-compression properties and the compression recovery performance of sample under the single or multiple contractive condition, comprises the compression linearity, work done during compression, compression rebound rate and work done during compression response rate eigenwert; Frictional behaviour is meant the friction behavior of specimen surface under pressure, comprises coefficient of static friction and kinetic friction coefficient eigenwert; Corresponding characteristic curve is hairiness number-displacement curve, hairiness index-displacement curve, pressure-displacement curve, friction force-displacement curve.

2, according to the measurement mechanism of the described method of claim 1, it is characterized in that it being optics and mechanics combination in site measurement mechanism, constitute by bottom deck assembly, power measuring mechanism, roller haulage gear, optical measurement mechanism, displacement drive mechanism, power and form signals collection, control and disposal system and computing machine; Wherein power measuring mechanism, roller haulage gear, optical measurement mechanism, displacement drive mechanism all are installed on the base plate; Yarn or fabric sample are via cord roller, a pair of rear roller, a pair of front roller output while, by filoplume on yarn or the fabric sample surface on the optical measurement mechanism picked-up cord roller that is positioned at level heights such as digital CCD image pick-up device center of cord roller left side and high resolving power and cord roller kernel of section are positioned at; Implement the compression of sample on the cord roller by being positioned at power measuring mechanism directly over the cord roller, obtain apparent thickness; Constitute the roller haulage gear by a pair of rear roller and a pair of front roller that are positioned at level heights such as cord roller lower right, jaw center; By be positioned in the middle of a pair of rear roller and a pair of front roller, hold up sample with the back-up block of level heights such as roller nip is centered close to, the power measuring mechanism that has briquetting is positioned at directly over the back-up block and can be driven and compresses sample straight down, and measures compression performance by pressure transducer collection that link to each other with briquetting, the induction vertical direction; Compress following sample straight down to setting positive pressure value by the drive mechanism briquetting, the output of roller haulage gear traction sample can be measured frictional behaviour by the force transducer collection of the sensation level direction that links to each other with back-up block; The control of whole device, data acquisition are finished by the computing machine that links to each other and each software module with processing, interface operation and setting.

3, measurement mechanism according to claim 2 is characterized in that described power measuring mechanism is made up of three high-precision force sensors, and measurement range is respectively 0～500g, 0～500g and 0～100g, and precision is 0.02%; Described three force transducers link to each other with compression blocks, briquetting and back-up block respectively.

4,, it is characterized in that described bottom deck assembly is made up of base plate, objective table and the backstay of fixing compressor structure, rotation and horizontal mobile mechanism and optical measurement mechanism according to the measurement mechanism of the described method of claim 2.

5, measurement mechanism according to claim 2 is characterized in that described roller haulage gear, by finish yarn or fabric between cord roller, rear roller, briquetting and the back-up block and a pair of front roller and a pair of rear roller that move on the front roller form.

6, measurement mechanism according to claim 2, it is characterized in that described optical measurement mechanism is made of the digital CCD image pick-up device of high resolving power that reads specimen length direction any time specimen surface filoplume form at a high speed, in real time, and link to each other by high speed image acquisition board with computing machine.

7, measurement mechanism according to claim 2, it is characterized in that described displacement drive mechanism constitutes by being loaded on five sleeve screw rod mechanisms on the base plate and stepper motor and respective drive circuit, its useful range is 0～250mm, precision≤± 3 μ m, and speed is that 1～200mm/min is adjustable.

8, measurement mechanism according to claim 2, it is characterized in that described optics and mechanics combination in site measurement mechanism, drive and the roller rotation by compression assembly, force transducer is responded to the signals collecting and the programmed control of stressed and specimen surface form, drive controlling card by correspondence, data collecting card, image pick-up card, and the measuring system that computing machine constituted that has program software that is attached thereto, described drive controlling is meant by compression blocks, the compression assembly that briquetting and back-up block are formed and the driving and the control of roller comprise the digital-to-analog conversion card, voltage/frequency frequency converter and stepper motor; Described signals collecting is meant the force signal data collecting card of the collection of power and specimen surface form signals and filoplume form image pick-up card; Described program measurement is meant the perfect measurement that is undertaken by the program of software set, and it comprises signals collecting and display module, drive control module, image acquisition and processing module, data processing and curve show and corresponding storage, print module and interface operation module in real time in real time.

9, method according to claim 1 is characterized in that being used for the measurement of yarn, rope class and fabric.

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