阅读说明：本技术 一种牵伸区内变速点分布的在线检测装置及其方法 (On-line detection device and method for distribution of speed change points in drafting zone ) 是由 刘新金 苏旭中 谢春萍 徐伯俊 宋娟 于 2020-04-14 设计创作，主要内容包括：本发明涉及一种牵伸区内变速点分布的在线检测装置,包括光照装置和投影装置,光照装置与投影装置分别安装在牵伸区的纤维条的上方与下方,光照装置将牵伸区内的纤维条的投影完全的呈现在投影装置上；本发明还涉及一种牵伸区内变速点分布的在线检测方法,根据荧光幕布上的直角坐标系以及单元网格得到荧光幕布上的投影的上、下侧边的坐标,将获取的各坐标信息传递到客户端,通过客户端获取纤维条上侧边的上曲线方程和下侧边的下曲线方程,而后将上曲线和下曲线沿着横坐标等分成一定的份数,通过离散切割计算每一份内的上曲线和下曲线之间面积,最后通过计算相邻两份之间的面积差得到牵伸区内的变速点分布曲线。(The invention relates to an online detection device for distribution of speed change points in a drafting zone, which comprises an illumination device and a projection device, wherein the illumination device and the projection device are respectively arranged above and below a fiber strip in the drafting zone; the invention also relates to an on-line detection method for distribution of the variable speed points in the drafting zone, which comprises the steps of obtaining the coordinates of the upper side and the lower side of the projection on the fluorescent screen according to a rectangular coordinate system and a unit grid on the fluorescent screen, transmitting the obtained coordinate information to a client, obtaining an upper curve equation of the upper side and a lower curve equation of the lower side of a fiber strip through the client, equally dividing the upper curve and the lower curve into a certain number of parts along the horizontal coordinate, calculating the area between the upper curve and the lower curve in each part through discrete cutting, and finally calculating the area difference between the two adjacent parts to obtain the distribution curve of the variable speed points in the drafting zone.)

1. An on-line measuring device of speed change point distribution in draft zone which characterized in that: the device comprises an illumination device and a projection device, wherein the illumination device and the projection device are respectively arranged above and below a fiber strip in a drafting zone, the illumination device, the projection device and the fiber strip in the drafting zone are coaxial, and the illumination device completely presents the projection of the fiber strip in the drafting zone on the projection device.

2. An on-line detecting device for the distribution of the speed changing points in the draft zone according to claim 1, wherein: the illumination device comprises a light emitting tube (5), a first fixing device and an adjusting device, wherein the light emitting tube (5) is fixedly arranged at the position above the fiber strips in the drafting zone through the first fixing device, and the adjusting device adjusts the brightness of the light emitting tube (5).

3. An on-line detecting device for the distribution of the speed changing points in the draft zone according to claim 2, wherein: the projection device comprises a fluorescent curtain (6) and a second fixing device, wherein a rectangular coordinate system is arranged on the fluorescent curtain (6), and a plurality of unit grids formed by unit grids with the same size are divided on the fluorescent curtain (6) with the rectangular coordinate system; the fluorescent curtain (6) is fixedly arranged at the lower position of the fiber strips in the drafting zone through the second fixing device.

4. An on-line detecting device for the distribution of the speed changing points in the draft zone according to claim 3, wherein: the length and width of the unit cells on the fluorescent curtain (6) are set within 0.1 mm.

5. An on-line detecting device for the distribution of the speed changing points in the draft zone according to claim 3, wherein: the light emitting tube (5) is movable and can always keep the light rays to completely irradiate all the fiber strips in the drafting zone; the fluorescent curtain (6) always keeps the projection of all the fiber strips in the drafting zone to be positioned completely above the fluorescent curtain (6), and the position of the fluorescent curtain (6) is kept unchanged in the same test process.

6. An on-line detection method for the distribution of speed change points in a drafting zone, comprising the steps of:

step one, installation: the light emitting tube (5) is fixedly arranged above the fiber strips in the drafting zone through the first fixing device, and the fluorescent curtain (6) is fixedly arranged below the fiber strips in the drafting zone through the second fixing device;

step two, obtaining a mass distribution change area of the fiber strips in the drafting area: the light emitting tube (5) completely presents the projection of the fiber strips in the drafting area on the fluorescent curtain (6), at the moment, on the fluorescent curtain (6), by taking the abscissa on the fluorescent curtain (6) as the bottom side, the edge line of the fiber strip on one side, which is positioned above the formed projection along the length direction of the fiber strip, is an upper side, and the edge line of the fiber strip on one side, which is positioned below the formed projection is a lower side, the coordinates of the upper side point and the lower side point of the fiber strip at each unit grid point are obtained through the unit grids divided on the fluorescent curtain (6), then the obtained coordinate information of the upper side point and the lower side point of each fiber strip is transmitted to a client, the client has certain independent computing capability, and the client directly draws the upper side curve and the lower side curve of the fiber strip in the drafting area according to the obtained coordinate information of the upper side point and the lower side point, the area between the upper side curve and the lower side curve is the mass distribution change area of the fiber strip in the drafting area;

step three, acquiring a mass distribution curve of the fiber strip in the drafting zone: equally dividing the upper side curve and the lower side curve into a plurality of parts along the abscissa of the fluorescent screen (6), wherein each part of the parts contains the same multiple of the number of unit grids, calculating the area of a region between the upper side curve and the lower side curve in each part of the parts according to the mass distribution change region of the fiber strip in the drafting region obtained in the step two, discretely dividing the part between two adjacent grid units in each region into a small area region, approximating the part into a rectangular region, taking the width of each grid unit as the width of the approximated rectangular region, taking the difference between the ordinate of the upper side curve corresponding to any grid unit and the ordinate of the upper side curve as the length of the approximated rectangular region, and sequentially and directly calculating the area of each approximated rectangular region, and then adding the areas of all the approximated rectangular regions in each region to obtain the area of each region Area, then taking the obtained area value of each area as a vertical coordinate, and selecting the horizontal coordinate corresponding to each area value at any equal interval, thereby drawing a mass distribution curve of the fiber strips in the drafting zone on a rectangular coordinate system;

step four, acquiring a distribution curve of speed change points of the fiber strips in the drafting zone: and D, subtracting the area value with the larger abscissa from the area value with the smaller abscissa in two adjacent area values in sequence according to the area value of each equal division region between the upper side curve and the lower side curve of the sliver obtained in the step three, thereby obtaining one less area value difference value than the equal division region in sequence, taking each obtained area value difference value as the ordinate, and selecting the abscissa corresponding to each area value difference value at any equal interval, thereby drawing the distribution curve of the speed change points of the sliver in the drafting region on a rectangular coordinate system.

Technical Field

The invention belongs to the technical field of new textile technologies, and particularly relates to an online detection device and method for distribution of speed change points in a drafting zone.

Background

At present, in the spinning process, a fiber bundle or a fiber roll with certain uniformity is prepared by opening and impurity removal of larger fiber blocks which are disordered and contain more impurities, then the fiber bundle or the fiber roll is finely and deeply opened and impurity removal to prepare an initial fiber strip, the fiber straightening state in the fiber strip is poor, the fiber of the fiber strip mostly contains hooks at the front part or the rear part or both the front end and the rear end, then the fiber strip is combed and drawn or directly drawn, the fiber strip is further stretched and thinned through the drafting process, the fiber straightening degree in the fiber strip is improved through the mutual sliding between the fibers in the stretching process, thus the drawn strip with further improved quality is obtained, then the prepared drawn strip is drawn, thinned and twisted and wound by a roving machine to prepare a roving with certain strength, the roving is drawn, thinned, twisted and wound by a spinning machine to obtain the spun yarn with certain strength. Therefore, drafting is one of the most important links in the fiber spinning process, and the quality of drafting can be directly determined to be yarn quality. In the drafting process of spinning, fibers in a fiber strip or a fiber bundle slide mutually by changing slow motion into fast motion, and the point of the fiber changing from the slow motion into the fast motion is the speed change point of the fiber, so the distribution of the speed change points of the fiber plays the most important role in the drafting quality, and the real-time detection of the distribution of the speed change points of the fiber in a drafting area is particularly important.

Disclosure of Invention

Aiming at the problems, the invention provides an online detection device and method for the distribution of the speed change points in the drafting zone, which realize the real-time online detection of the distribution of the speed change points of the fibers in the drafting zone by additionally arranging an illumination device above two rows of rollers in the drafting zone and additionally arranging a fluorescent curtain with unit grids below the rollers.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides an online detection device that variable speed point distributes in draft district, includes illumination device and projection arrangement, the illumination device with projection arrangement installs respectively in the top and the below of the ribbon in draft district, the illumination device projection arrangement and the ribbon in draft district are coaxial, the illumination device with the complete presentation of projection of the ribbon in the draft district on the projection arrangement.

Preferably, the illumination device comprises a light emitting tube, a first fixing device and an adjusting device, the light emitting tube is fixedly installed at the position above the fiber strips in the drafting zone through the first fixing device, and the adjusting device adjusts the brightness of the light emitting tube.

Preferably, the projection device comprises a fluorescent screen and a second fixing device, the fluorescent screen is provided with a rectangular coordinate system, and a plurality of unit grids formed by unit grids with the same size are divided on the fluorescent screen provided with the rectangular coordinate system; the fluorescent curtain is fixedly arranged at the lower position of the fiber strips in the drafting zone through the second fixing device.

Preferably, the length and width of the unit cells on the fluorescent screen are set within 0.1 mm.

Preferably, the light-emitting tube is movable, and the light can be always kept to completely irradiate all the fiber strips in the drafting zone; the fluorescent curtain always keeps the projection of all the fiber strips in the drafting zone to be positioned completely above the fluorescent curtain, and the position of the fluorescent curtain is kept unchanged in the same testing process.

The invention also provides an online detection method for the distribution of the speed change points in the drafting zone, which comprises the following steps:

step one, installation: the light-emitting tube is fixedly arranged above the fiber strips in the drafting zone through the first fixing device, and the fluorescent curtain is fixedly arranged below the fiber strips in the drafting zone through the second fixing device;

step two, obtaining a mass distribution change area of the fiber strips in the drafting area: the luminotron completely presents the projection of the fiber strips in the drafting zone on the fluorescent screen, at the moment, on the fluorescent screen, the abscissa on the fluorescent screen is taken as the bottom edge, the edge line of the fiber strip at one side, which is positioned above the formed projection along the length direction of the fiber strip, is the upper side, the edge line of the fiber strip at one side, which is positioned below the formed projection is the lower side, the coordinates of the upper side point and the lower side point of the fiber strip at each unit grid point are obtained through the unit grids divided on the fluorescent screen, then the obtained coordinate information of the upper side point and the lower side point of each fiber strip is transmitted to a client, the client has certain independent computing capability, the client directly draws the upper side curve and the lower side curve of the fiber strip in the drafting zone according to the obtained coordinate information of the upper side point and the lower side point, and the area positioned between the upper side curve and the lower side curve is the mass distribution change zone of the fiber strip in the drafting zone;

step three, acquiring a mass distribution curve of the fiber strip in the drafting zone: equally dividing the upper side curve and the lower side curve into a plurality of parts along the abscissa on the fluorescent screen, wherein each part contains the same number of unit grids, calculating the area of the area between the upper side curve and the lower side curve in each part according to the mass distribution change area of the fiber strip in the drafting area obtained in the step two, discretely dividing the part between two adjacent grid units in each area into a small area, approximating the part into a rectangular area, taking the width of each grid unit as the width of the approximated rectangular area, taking the difference between the ordinate of the corresponding upper side curve at any grid unit and the ordinate of the corresponding upper side curve as the length of the approximated rectangular area, and sequentially and directly calculating the area of each approximated rectangular area, and then adding the areas of all the approximated rectangular areas in each area to obtain the area of each area, then, the obtained area value of each area is taken as a vertical coordinate, and the horizontal coordinate corresponding to each area value is selected at any equal interval, so that a mass distribution curve of the fiber strips in the drafting zone is drawn on a rectangular coordinate system;

step four, acquiring a distribution curve of speed change points of the fiber strips in the drafting zone: and D, subtracting the area value with the larger abscissa from the area value with the smaller abscissa in two adjacent area values in sequence according to the area value of each equal division region between the upper side curve and the lower side curve of the sliver obtained in the step three, thereby obtaining one less area value difference value than the equal division region in sequence, taking each obtained area value difference value as the ordinate, and selecting the abscissa corresponding to each area value difference value at any equal interval, thereby drawing the distribution curve of the speed change points of the sliver in the drafting region on a rectangular coordinate system.

Through the technical scheme, compared with the prior art, the invention has the following beneficial effects:

the invention adds an illumination device above a front row and a back row of rollers in a drafting zone, adds a fluorescent curtain below the two rows of rollers, arranges a rectangular coordinate system on the fluorescent curtain, distributes unit grids in the rectangular coordinate system, illuminates fiber strips in the drafting zone by light emitted by the illumination device above when in use, thereby presents the projection of the fiber strips on the fluorescent curtain, then obtains the coordinates of the upper and the lower sides of the projection of the fiber strips along the length direction of the fiber strips according to the rectangular coordinate system on the fluorescent curtain and the unit grids, thereby transmits each coordinate obtained by an interface of the fluorescent curtain to a client, obtains an upper curve equation of the upper side and a lower curve equation of the lower side of the fiber strips by the client, equally divides the upper curve and the lower curve into a plurality of parts along the horizontal coordinate, calculates the area between the upper curve and the lower curve in each part by discrete cutting, and finally, calculating the area difference between two adjacent parts to obtain a distribution curve of the speed change points in the drafting zone.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic diagram of the overall structure of the present invention.

In the figure: 1. a front rubber roller is coated; 2. a front bottom roller; 3. then a sizing roller is arranged; 4. a rear bottom roller; 5. a light emitting tube; 6. a fluorescent screen.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.

As shown in figure 1, the invention relates to a drafting device, which comprises a front roller drafting pair and a rear roller drafting pair, wherein the front roller drafting pair comprises a front lower roller 2 and a front upper rubber roller 1, the rear roller drafting pair comprises a rear lower roller 4 and a rear upper rubber roller 3, the front lower roller 2 and the rear lower roller 4 are both of steel structures, and are provided with strip-shaped grooves at equal intervals on the surfaces of the rollers, the front upper rubber roller 1 is consistent with the rear upper rubber roller 3 in structure, the front upper rubber roller 1 comprises a rubber roller shaft, a rubber roller sleeve is connected on the rubber roller shaft through a bearing, the rubber roller sleeve is made of rubber and can freely rotate around the rubber roller shaft, the front upper rubber roller 1 and the rear upper rubber roller 3 are arranged on a pressurizing assembly, and when in use, the front upper rubber roller 1 is in contact with the front lower roller 2 under a certain pressure through the pressing of the pressurizing assembly, thus forming a front pressing jaw between the two, and the contact between the rear upper glue roller 3 and the rear lower roller 4 under a certain pressure, thus forming a rear pressing jaw between the two, the area between the front pressing jaw and the rear pressing jaw being a drafting zone.

The drafting device specifically operates as follows, the motor drives roller 2 under preceding, roller 4 initiatively rotates under the back, then drive respectively with it contact preceding rubberizing roller 1, back rubberizing roller 3 carries out passive with fast, reverse rotation, just the rotational speed of roller 2 is greater than roller 4's rotational speed under the back, thereby form the difference in speed between the two, realize then that the draft to the ribbon between the two is attenuated the effect, in the drafting process, the rear end of ribbon by press the nip after press and press, the front end by press the nip before press and press, thereby make the ribbon when by press the frictional force field that the nip formed after or press the frictional force field that the nip formed after and during the internal friction force field integrated control between the fibre in the ribbon, fibre in the ribbon with the speed that roller 4 linear velocity is the same under the back is in the draft district slow motion, when the fiber strip moves to be controlled by the friction force field formed by the front pressing jaw, the fibers in the fiber strip overcome the acting force of the friction force field formed by the rear pressing jaw or the friction force field formed by the rear pressing jaw and the internal friction force field between the fibers in the fiber strip, so that the fibers in the fiber strip move rapidly in the drafting zone at the same speed as the linear speed of the front lower roller 2, in the process of converting the fibers from slow motion to rapid motion, mutual slippage occurs between the fibers, so that the linear density of the fiber strip is reduced, the point of converting the fibers from slow motion to rapid motion is called as the speed change point of the fibers, the speed change points of the fibers in the fiber strip in the drafting zone form the distribution of the speed change points in the drafting zone, and the specific embodiment of online detection on the distribution of the speed change points of the fibers in the drafting zone is as follows: