CN109811447B - Device for testing network degree of network wire - Google Patents
Device for testing network degree of network wire Download PDFInfo
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- CN109811447B CN109811447B CN201910089239.3A CN201910089239A CN109811447B CN 109811447 B CN109811447 B CN 109811447B CN 201910089239 A CN201910089239 A CN 201910089239A CN 109811447 B CN109811447 B CN 109811447B
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Abstract
The invention relates to a device for testing the network degree of a network wire, which comprises a winding device, an unwinding device, a needle resetting group, a tension testing device and a processor, wherein the winding device and the unwinding device are matched with each other and are used for driving the network wire to perform unwinding motion along a straight line A, the needle resetting group and the tension testing device are distributed along the straight line A and are positioned between the winding device and the unwinding device, the needle resetting group comprises a plurality of needles and is used for penetrating into the network wire in the unwinding process to separate all bonded monofilaments, the tension testing device is used for acquiring the tension data of the network wire in the unwinding process, and the processor is connected with the tension testing device and is used for analyzing the tension data of the network wire to obtain the network degree of the network wire. The device of the invention overcomes the problem of omission of a plurality of network points in the traditional device during single-needle test, greatly reduces the omission condition of network knots in the network yarn, avoids the problem of wrong network knot statistics caused by filament twisting, and realizes the accurate network degree statistics of the network yarn.
Description
Technical Field
The invention belongs to the field of chemical fibers, and relates to a device for testing the network degree of a network yarn.
Background
In the spinning process of the chemical raw materials, each filament is not single but multifilament formed by combining 15-100 fine monofilaments. If compressed air is used to blow the filaments loose during spinning and twist them into a network to produce a network. The network degree is an important parameter for characterizing the network yarn, and for a specific network yarn, the network degree also satisfies a specific range. In practice, the condition that the network degree of the network yarn is too large and too small often occurs, which undoubtedly has great influence on the performance of the network yarn, the network degree is too large, which causes network spots on the surface of the final fabric, and the network degree is too small, which causes the problems that the network yarn is loose and fluffy in the production of the subsequent process, so that the network degree test becomes the key point of the current research.
The traditional method for manually detecting the network degree of the network yarn is to slowly move a needle hook with specified load in the yarn with the length of 1m, and the needle hook stops moving every time a network knot is encountered, so that the number of the network knots, namely the network degree, is counted. The main problems of this method are that the tested network degree has low accuracy and often has a small number, because the network junctions in the network filaments often cannot completely twist all filaments in the whole cross section, and thus the needle hooks still pass through between the filaments which are not twisted together when passing through the network junctions without any resistance, and the tester cannot identify the network points at the places, so that the network degree is small. The existing network yarn testing device adopts a similar detection method, a tension tester is used for monitoring the tension of a network yarn inserted with a thin needle on line, as shown in figure 1, the working principle is that a winding device 1 drives the network yarn to move, the network yarn passes through a thin needle 5, a tension sensor 6 is used for testing the tension of the network yarn, a filament yarn to be detected is placed at an unwinding device 4, and when the tension of the network yarn changes, the filament yarn is recorded as a network knot. Although the method is time-saving and labor-saving compared with a manual testing method and eliminates the influence of manual subjectivity, the network knots are missed to be detected, the tested network degree is small, and the method is easily influenced by the fact that the twisted filaments in the network yarn pass through the fine needles to be wrongly recorded as the network knots in the network yarn winding and unwinding process, and the testing result is inaccurate.
Therefore, the research on a device capable of accurately testing the network degree of the network wire is of great significance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a device for testing the network degree of a network wire, and the network degree of the network wire tested by the device has higher accuracy than that of the network wire tested by the prior method. The invention increases the number of needles, namely, the network degree is tested by utilizing the change of the tension generated by a plurality of needles of the multi-needle group passing through the network knot of the network yarn, and simultaneously, the design algorithm is adopted, namely, when the tension data T is obtained1Tension data T before0When the increase rate is more than or equal to a%, the network node is marked as a network node, and the phenomenon of missing network node detection is effectively avoided by adopting the method. In addition, a method for judging whether the filament is seriously twisted is also designed, and corresponding solving measures are provided, so that the phenomenon that the filament is seriously twisted is avoidedThe phenomenon of network knot is misjudged due to tension generated when the filament is seriously twisted, and the testing precision is further improved.
In order to achieve the purpose, the invention adopts the technical scheme that:
a device for testing the network degree of a network wire comprises a winding device, an unwinding device, a compound needle group, a tension testing device and a processor;
the winding device and the unwinding device are matched with each other and are used for driving the interlaced yarn to perform unwinding motion along the direction of the straight line A; the winding device and the unwinding device can realize two forms of forward rotation and reverse rotation, when the winding roller rotates forwards, the network wire is wound, and when the winding roller rotates backwards, the network wire is loosened;
the compound needle group and the tension testing device are distributed along the straight line A and are positioned between the winding device and the unwinding device, and relative to the tension testing device, the compound needle group is closer to the unwinding device;
the compound needle group comprises a plurality of needles which are used for penetrating into the interlaced yarn to separate the bonded monofilaments completely in the unwinding process;
the tension testing device is used for acquiring tension data of the network wire in the unwinding process;
the processor is connected with the tension testing device and used for analyzing tension data of the network wire to obtain the network degree of the network wire; the tension data are arranged in time sequence, and when the tension data T is1Tension data T before0When the increasing rate is more than or equal to a%, recording as a network node; and a% is obtained by calculating the increasing rate of each network node when passing through the needle point and two adjacent tension data in front of the needle point and then averaging after manually marking a plurality of network nodes.
In the testing process, when the network yarn moves, the needle points of all the needles are inserted into the network yarn, the tension changes when the needle points touch the network knots, the tension testing device tests to obtain tension data and transmits the data to the processor, the processor calculates a result, the needle points separate the monofilaments bonded in the network knots, the network yarn continues to move forwards, and when only one needle point of all the needles in the multi-needle group touches the network knots, the tension changesAnd analyzing the tension data by a processor when the tension data T is1Tension data T before0If the rate of increase is a% or more, it is recorded as a network node. However, in the prior art, the automatic network degree detecting instrument only adopts one needle point, and the network knot does not bond the monofilaments in the whole section together, so that if the needle point happens to pass through one network knot, but some monofilaments at the section of the network knot are not bonded together, and the needle point happens to be between the unbonded monofilaments, the tension of the network yarn cannot be changed, and the network knot can be missed to be detected.
As a preferred technical scheme:
the device for testing the network degree of the network wire is characterized in that the plurality of network nodes are 300 network nodes.
The device for testing the network degree of the network wire is characterized in that the winding device consists of a winding roller, a braking device Z1 connected with the winding roller and a driving device I, wherein the braking device Z1 is used for braking the winding roller, and the driving device I is used for driving the winding roller to rotate.
The device for testing the network degree of the network wire is characterized in that the unwinding device consists of an unwinding roller, a braking device Z2 connected with the unwinding roller and a driving device II, wherein the braking device Z2 is used for braking the unwinding roller, and the driving device II is used for driving the unwinding roller to rotate.
The device for testing the network degree of the network wire comprises a compound needle group, a compound needle group and a plurality of needles, wherein the compound needle group consists of a bottom plate and a plurality of needles vertically inserted on the bottom plate, and the diameters of needle rods of all the needles are 0.5 mm; all the needles are distributed on two straight lines B and C which are parallel to each other and vertical to the straight line A, and the distance between the straight lines B and C is 2 mm; all the needles on the straight line B or the straight line C are arranged at equal intervals, the interval between every two adjacent needles is 2mm, the orthographic projections of all the needles on the straight line B and the straight line C on a plane vertical to the straight line A are alternately arranged, namely, a first needle of a second row is positioned between a first needle of the first row and a second needle of the first row, and so on, the needles on the multiple needle group are generally smaller, the bottoms of the needles are thicker, more needles cannot be put down if the needles are arranged side by side, the interval between needle points is larger, the needles can be effectively arranged by arranging the needles in two rows, and the needles can be more conveniently disassembled by arranging the needles in one row.
In the device for testing the network degree of the network yarn, the number of the needles in the multi-needle group is 10 times of the ratio of the width of the network yarn to the width of all the needle coverage areas, and the ratio is rounded by a rounding method. The purpose of the mode is mainly to ensure that the arrangement density of the needles inserted into the interlaced yarn is the same when the interlaced yarn with different widths is detected, and the arrangement can ensure that the final detection result cannot be influenced by different needle densities when the device detects the interlaced yarn with any width. When the width matching between the multiple needle group and the network yarn is not good, the effect of better detecting the network degree can be achieved by adjusting the distribution of the fine needles in the two rows of the base.
The device for testing the network degree of the network wire is characterized in that the base plate is connected with the driving device III, and the driving device III is used for driving the base plate to move up and down along the direction perpendicular to the network wire. In the running process of the instrument, if a long yarn is twisted and the like is misled to be a network knot, the driving device III can move the needle returning group downwards to enable the needle returning group to be separated from the network yarn, and the network yarn is adjusted by the winding device and the unwinding device and then moves the needle returning group upwards again to be inserted into the network yarn.
The driving devices I, II and III and the braking devices Z1 and Z2 are connected with a central controller, the central controller is used for adjusting the running states of all the driving devices and the braking devices when the serious torsion problem of the filament occurs, and the central controller is connected with the processor;
the traditional detection instrument does not consider the problem that the monofilaments in the network wire are twisted, once the monofilaments are twisted, the monofilaments in the network wire are not parallel, the network wire is subjected to false detection of network knots due to the fact that tension of the network wire is changed based on extra resistance of a needle point, and when the monofilaments are twisted seriously, the central controller firstly brakes the winding device and the unwinding device, then drives the winding device to reversely wind, simultaneously drives the doubling needle group to move downwards to separate the needle from the network wire, enables the 30m long network wire to be loosened and restored, then drives the winding device and the doubling needle group to reset, and finally drives the winding device and the unwinding device; after recovery, the 30m long interlaced yarn is continuously detected again;
the occurrence of the severe twisting problem of the filaments means that the value u measured for three consecutive minutes is greater than 5%, and the value u measured for the nth minute is calculated as follows:
in the formula, TunIs the average value of the n-th minute tension data, T, measured with a device for measuring the network degree of a network wireu0The comparison device is different from the device used for testing the network degree of the interlaced yarn in that it does not contain a multi-needle set, for the average value of the tension data measured in 1 minute using the comparison device.
The device for testing the network degree of the network wire is characterized in that the tension testing device is a tension tester. The means for testing tension data is not limited thereto, and other means capable of performing the same function are applicable to the present invention.
The invention mechanism is as follows:
the traditional method for testing the network degree of the network wire is time-consuming and labor-consuming due to manual detection, and the result subjectivity is too strong, or the missed detection is serious due to single number of probes in an automatic detection device, and the false detection caused by network wire torsion cannot be considered, but the device for testing the network degree of the network wire has higher detection efficiency and detection accuracy, and the main reasons are as follows:
on one hand, the invention adds a compound needle group, a tension testing device and a processor between a winding device and an unwinding device, wherein the compound needle group consists of two rows of alternately arranged needles which are inserted into a network wire, the tension testing device is used for testing the data value of the tension generated by a needle point when the needle point passes through a network node, and the processor is used for calculating the change value of the tension data at two adjacent moments, namely when the tension data T is1Tension data T before0When the increasing rate is more than or equal to a%, the network node is marked as a network node, and because the multi-needle set adopted by the invention can realize multi-channel network wire detection, the accuracy of the test process is high, and the problem of missing detection of the network node is greatly reduced;
on the other hand, the winding device and the unwinding device of the invention are also connected with a braking device and a driving device, the bottom plate of the compound needle group is also connected with the driving device, the driving device and the braking device are also connected with the central controller, if the values u measured by the processor in three continuous minutes are all more than 5%, the problem that the filament yarn is seriously twisted is possibly caused, the motion of the winding roller is stopped, the winding roller is reversed after the unwinding device is braked, and the detection is continued after the network yarn is loosened and recovered, therefore, the condition that the twisted filament yarn is mistakenly counted as a network node due to the increase of the network yarn tension caused by the obstruction when passing through the fine needle is avoided, and the testing precision is greatly improved.
Has the advantages that:
(1) according to the device for testing the network degree of the network wire, the condition of missing detection of network knots in the network wire is greatly reduced by arranging the multi-needle group, and the defect of low network degree testing accuracy caused by single-needle testing in the traditional network wire testing is overcome;
(2) according to the device for testing the network degree of the network wire, in the testing process, the tension of the network wire is recorded by the tension tester and the tension uniformity parameter is calculated according to the formula so as to judge whether the network wire has the problem of excessive torsion of the long wire at the moment, so that the problem of miscalculation of the network wire into network knots due to excessive torsion of the long wire is solved;
(3) the device for testing the network degree of the network wire has the advantages of simple structure, high testing precision and high efficiency, and has wide application prospect.
Drawings
FIG. 1 is a schematic structural diagram of a prior art apparatus for testing network connectivity of a network wire;
FIG. 2 is a schematic structural diagram of an apparatus for testing network connectivity of a network wire according to the present invention;
FIG. 3 is a schematic diagram of a plurality of card rows of a multi-needle set in the apparatus for testing network density of network yarn according to the present invention;
the device comprises a winding device 1, a tension tester 2, a needle resetting group 3, an unwinding device 4, a fine needle 5 and a tension sensor 6.
Detailed Description
The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
A device for testing the network degree of network wires is shown in figure 2 and comprises a winding device 1, an unwinding device 4, a needle returning group 3, a tension tester 2 and a processor.
The winding device 1 consists of a winding roller, a braking device Z1 connected with the winding roller and a driving device I, wherein the braking device Z1 is used for braking the winding roller, and the driving device I is used for driving the winding roller to rotate. The unwinding device 4 consists of an unwinding roller, a braking device Z2 connected with the unwinding roller and a driving device II, wherein the braking device Z2 is used for braking the unwinding roller, and the driving device II is used for driving the unwinding roller to rotate. The winding device 1 and the unwinding device 4 are mutually matched and used for driving the interlaced yarn to perform unwinding motion along the direction of the straight line A.
The compound needle group 3 is used for penetrating into the interlaced yarn to separate the bonded monofilaments completely in the unwinding process and consists of a bottom plate and a plurality of needles vertically inserted on the bottom plate, as shown in figure 3, the diameter of the needle bar of all the needles is 0.5 mm; all the needles are distributed on two straight lines B and C which are parallel to each other and vertical to the straight line A, and the distance between the straight lines B and C is 2 mm; all the needles on the straight line B or the straight line C are arranged at equal intervals, the interval between every two adjacent needles is 2mm, and the orthographic projections of all the needles on the straight line B and the straight line C on a plane vertical to the straight line A are alternately arranged. The bottom plate of the multi-needle group 3 is connected with a driving device III, and the driving device III is used for driving the bottom plate to move up and down along the direction vertical to the interlaced yarn.
The number of needles in the multiple needle group 3 is 10 times of the ratio of the width of the interlaced yarn to the width of all needle covering areas, and the ratio is rounded up by a rounding method.
The tension tester 2 is used for acquiring tension data of the network wire in the unwinding process;
the needle resetting group 3 and the tension tester 2 are distributed along a straight line A and are positioned between the winding device 1 and the unwinding device 4, and relative to the tension tester 2, the needle resetting group 3 is closer to the unwinding device 1;
the processor is connected with the tension tester 2 and used for analyzing the tension data of the interlaced yarn to obtain the network degree of the interlaced yarn; the tension data are arranged in time sequence, and when the tension data T is1Tension data T before0When the increasing rate is more than or equal to a%, recording as a network node; and a% is obtained by calculating the increasing rate of each network node when passing through the needle point and two adjacent tension data in front of the needle point and then averaging after manually marking 300 network nodes.
The driving devices I, II and III and the braking devices Z1 and Z2 are connected with a central controller, the central controller is used for adjusting the running states of all the driving devices and the braking devices when the serious torsion problem of the filament occurs, and the central controller is connected with a processor;
the occurrence of the severe twisting problem of the filaments means that the value u measured for three consecutive minutes is greater than 5%, and the value u measured for the nth minute is calculated as follows:
in the formula, TunIs the average value of the n-th minute tension data, T, measured with a device for measuring the network degree of a network wireu0The comparison device is different from the device used for testing the network degree of the interlaced yarn in that it does not contain a multi-needle set, for the average value of the tension data measured in 1 minute using the comparison device.
Through verification, the device for testing the network degree of the network wire overcomes the problems of network degree test omission, strong subjectivity, network knot false detection and the like in the traditional network degree test method, and the measured network degree of the network wire is high in accuracy.
Claims (9)
1. A device for testing the network degree of a network wire is characterized in that: the device comprises a winding device, an unwinding device, a compound needle group, a tension testing device and a processor;
the winding device and the unwinding device are matched with each other and are used for driving the interlaced yarn to perform unwinding motion along the direction of the straight line A;
the compound needle group and the tension testing device are distributed along the straight line A and are positioned between the winding device and the unwinding device, and relative to the tension testing device, the compound needle group is closer to the unwinding device;
the compound needle group comprises a plurality of needles which are used for penetrating into the interlaced yarn to separate the bonded monofilaments completely in the unwinding process;
the tension testing device is used for acquiring tension data of the network wire in the unwinding process;
the processor is connected with the tension testing device and used for analyzing tension data of the network wire to obtain the network degree of the network wire; the tension data are arranged in time sequence, and when the tension data T is1Tension data T before0When the increasing rate is more than or equal to a%, recording as a network node; and a% is obtained by calculating the increasing rate of each network node when passing through the needle point and two adjacent tension data in front of the needle point and then averaging after manually marking a plurality of network nodes.
2. The apparatus of claim 1, wherein the plurality of network nodes is 300 network nodes.
3. The device for testing network density of network wires according to claim 1, wherein the winding device is composed of a winding roller, a braking device Z1 connected with the winding roller and a driving device I, the braking device Z1 is used for braking the winding roller, and the driving device I is used for driving the winding roller to rotate.
4. The device for testing network wire network degree of claim 3, wherein the unwinding device is composed of an unwinding roller, a braking device Z2 connected with the unwinding roller and a driving device II, the braking device Z2 is used for braking the unwinding roller, and the driving device II is used for driving the unwinding roller to rotate.
5. The device for testing the network degree of the network wire according to claim 4, wherein the multi-needle group consists of a bottom plate and a plurality of needles vertically inserted on the bottom plate, and the diameter of the needle rod of all the needles is 0.5 mm; all the needles are distributed on two straight lines B and C which are parallel to each other and vertical to the straight line A, and the distance between the straight lines B and C is 2 mm; all the needles on the straight line B or the straight line C are arranged at equal intervals, the interval between every two adjacent needles is 2mm, and the orthographic projections of all the needles on the straight line B and the straight line C on a plane vertical to the straight line A are alternately arranged.
6. The apparatus of claim 5, wherein the number of needles in the plurality of needle sets is 10 times the ratio of the width of the network yarn to the width of the coverage area of all the needles, and the ratio is rounded.
7. The device of claim 6, wherein the base plate is coupled to a drive device III for driving the base plate up and down in a direction perpendicular to the network wire.
8. The device for testing network density of network wires of claim 7, wherein the driving devices I, II and III and the braking devices Z1 and Z2 are connected with a central controller, the central controller is used for adjusting the operation states of all the driving devices and the braking devices when the serious torsion problem of the filaments occurs, and the central controller is connected with the processor;
the occurrence of the severe twisting problem of the filaments means that the value u measured for three consecutive minutes is greater than 5%, and the value u measured for the nth minute is calculated as follows:
in the formula, TunIs the average value of the n-th minute tension data, T, measured with a device for measuring the network degree of a network wireu0The comparison device is different from the device used for testing the network degree of the interlaced yarn in that it does not contain a multi-needle set, for the average value of the tension data measured in 1 minute using the comparison device.
9. The device of claim 8, wherein the tension testing device is a tension tester.
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| CN109811447A (en) | 2019-05-28 |
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