CN210604230U - Yarn ball hardness measuring instrument - Google Patents
Yarn ball hardness measuring instrument Download PDFInfo
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- CN210604230U CN210604230U CN201920418158.9U CN201920418158U CN210604230U CN 210604230 U CN210604230 U CN 210604230U CN 201920418158 U CN201920418158 U CN 201920418158U CN 210604230 U CN210604230 U CN 210604230U
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Abstract
The utility model relates to a yarn group hardness measuring apparatu, yarn group hardness measuring apparatu includes measurement terminal and sensing device, measurement terminal includes the button, the display screen, a pedestal, pressure measurement circuit and treater, treater and button, the display screen, pressure measurement circuit all is connected, the base is connected with pressure measurement circuit pressure detection component, sensing device includes safety cover and measuring pin, measuring pin one end is passed and is stretched out behind the safety cover is inside, the other end and pedestal connection, the safety cover is installed on measurement terminal, the measuring pin head is the toper structure. The effective length of the measuring probe is 3-9 mm, and the height of the conical structure at the head of the measuring probe is not less than the distance that one end of the measuring probe extends out of the bottom surface of the protective cover. The taper of the head of the measuring probe is 30-75 degrees, and the taper height is 3-13 mm. The device has the advantages of simple structure, convenience and effectiveness in testing, accuracy and convenience.
Description
Technical Field
The application relates to the field of performance testing, in particular to a fiber yarn cluster hardness measuring instrument, which is particularly suitable for hardness measuring work of fiber yarn clusters.
Background
Taking the glass fiber industry as an example, the hardness of a fiber yarn group is an important evaluation index for yarn group forming, and the quality of yarn group hardness control is the basis of whether a product has good appearance and smooth use. The yarn ball has low hardness, which easily causes the conditions of loose and soft yarn ball, large diameter, weak internal structure support, easy deformation, inclined integral support package and the like, and the quality problems of knocking off and knotting, hoisting, collapsing and the like of fiber yarns occur in the using process. In addition, the yarn cluster hardness is also an important physical parameter indirectly reflecting the yarn cluster density, and is an important reference basis for fiber forming processes such as winding ratio, drawing tension and the like, as well as for packaging material selection and packaging process design. At present, no specific yarn ball hardness measuring instrument and uniform measuring method exist in the industry, and the main operation is to simply perform qualitative evaluation by methods such as manual hand pressing and the like. The evaluation method has the defects that the hardness value of the yarn group cannot be quantified, the evaluation has no unified standard, the subjective feeling of operators is greatly influenced, the test result is different from person to person, the test result is not accurate, and the like, and the popularization and the use of industrial standardized production are not facilitated.
The patent publication CN 104596872 a discloses a memory sponge hardness measuring instrument and a measuring method thereof, which are simple in structure, small in size, convenient to carry, simple in operation, and suitable for detecting various memory sponge hardnesses. However, due to the limitations of technical schemes such as the structural composition of the measuring instrument, the measuring instrument is only suitable for measuring the hardness of the memory sponge and is not suitable for detecting the hardness of the yarn cluster.
In summary, in view of the above disadvantages of the background art that there is no device and method for accurately and quantitatively measuring the hardness of a fiber yarn group in the industry at present, there is a need to provide a yarn group hardness measuring instrument with reasonable structural design, simple operation and accurate measurement result.
Disclosure of Invention
The technical problem that this application will be solved is to overcome the above-mentioned not enough that exists among the prior art, and provides a structural design succinct, and convenient to use, it is little that the measurement is influenced by human factor, the yarn group hardness measuring apparatu that measurement accuracy is high.
The technical scheme adopted by the application for solving the technical problems comprises the following steps: a yarn group hardness measuring instrument is characterized in that: including measurement terminal and sensing device, measurement terminal includes button, display screen, base, pressure measurement circuit and treater, and the treater is all connected with button, display screen, pressure measurement circuit, the pressure detection component of base and pressure measurement circuit be connected, sensing device includes safety cover and measuring pin, measuring pin one end stretch out after passing the safety cover inside, the measuring pin other end and pedestal connection, the safety cover is installed on measurement terminal, the measuring pin head be the toper structure. The conical structure is arranged, and the measurement result of the yarn bulk hardness is directly influenced by the shape of the probe head: because the hardness difference of different types of yarn groups is large, if a cylindrical or square flat-head-shaped non-conical test head or the like is adopted, the test head extending out of the protective cover part cannot be completely pressed into the yarn group for the yarn group with large hardness, and further, an effective test result cannot be obtained; if a testing head in a straight line shape or a cross shape is adopted, although the testing head extending out of the protective cover part is beneficial to being completely pressed into the yarn group, the product at the tested part can be damaged, and the production and the use of subsequent products are influenced. The conical probe testing head with reasonable taper is adopted by theoretical research and long-term test, and the problems can be effectively avoided.
The effective length of the measuring probe (namely the length of one end of the measuring probe extending out of the bottom surface of the protective cover) is 3-9 mm, preferably 4-8 mm, and the height (conical height) of the conical structure of the head of the measuring probe is not less than the distance of one end of the measuring probe extending out of the bottom surface of the protective cover.
Wherein, the measuring probe is connected with the base through a thread structure.
Wherein, the safety cover is a hollow cylindrical structure. The main effect of this application safety cover is that the effective length of the survey needle of guaranteeing to impress the yarn group part keeps unanimous, ensures measuring result's accuracy.
The taper of the probe head is 30-75 degrees, the taper height is 3-13 mm, preferably, the taper of the probe head is 40-70 degrees, and the taper height is 4-11 mm.
Further, the yarn cluster hardness of the application can be obtained by adopting the following measurement method:
s1, obtaining a corresponding relation equation between the measured value of the yarn mass hardness measuring instrument and the actual hardness, wherein the equation is H = (N/S)max）*L0.5*tan（θ）=｛N/【π*（L*tan（θ/2））2】｝*L0.5*tan（θ）；
Wherein H is the yarn ball hardness;
n is the maximum load borne by the yarn ball hardness tester in the testing process and the unit is Newton (N);
Smaxthe maximum cross-sectional area in square millimeters (mm) for measuring the effective length of the stylus during the process2）；
L is the effective length of the measuring needle (namely the length of one end of the measuring needle extending out of the bottom surface of the protective cover and the length of the measuring needle completely pressed into the measured yarn group in the actual measuring process) in millimeters (mm) in the measuring process;
theta is the stylus taper in degrees (°);
s2, fixing the yarn group (sample) to be tested, wherein the packaging film is removed from the position to be tested;
s3, starting a yarn group hardness measuring instrument and initializing;
s4, aligning the measuring needle to a certain point on the circumferential surface (the excircle surface) of the measured yarn ball (vertical to the central line of the measured yarn ball), pressing until the measuring needle extending out of the protective cover is completely pressed into the measured yarn ball, and recording the obtained measured value when the number on the display screen reaches a stable state (no jump in a short time, such as 3-5 seconds).
S5, measuring once at each of a plurality of different points which are distributed on the circumferential surface of the measured yarn mass at the same height and at the same distance (for example, repeating the step S4 at the next position clockwise or anticlockwise at intervals of 5cm or 30 degrees on the circumferential surface of the measured yarn mass), and averaging the measured values to obtain an average measured value.
And S6, calculating to obtain the hardness value of the tested yarn group according to the corresponding relation equation of the measured value and the hardness by using the average measured value in the step S5.
In step S2, the yarn package should not have defects such as mechanical damage and impurities.
In step S4, the needles extending out of the protective cover are pressed into the yarn group to be measured at a constant speed without tilting or by directly pushing the needles too hard or not pressing the needles into the yarn group to be measured.
Further, in the step S5, the average measurement value is obtained by taking one measurement at each of 3 or more points on the circumferential surface of the yarn package to be measured which are highly distributed at the same interval and at the same distance, and averaging the measurement values.
The application has the advantages of simple and effective test process, high accuracy of the measurement result, small size of the measuring instrument, convenience in carrying and simplicity in operation, and is suitable for hardness detection of various fiber yarn groups.
Drawings
FIG. 1 is a schematic structural diagram of a yarn bulk hardness measuring instrument according to an embodiment of the present application;
fig. 2 is a schematic view of the connection between the sensing device and the base shown in fig. 1.
Fig. 3 is a schematic view of a measured state and a measuring point of a measured yarn group fixedly arranged on a clean plane.
Detailed Description
For better understanding of the content of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, not all embodiments, and features in the embodiments and the embodiments of the present application can be combined with each other without conflict, and the present application will be described in detail below with reference to the drawings and with reference to the embodiments.
As shown in fig. 1 to 3, a yarn bulk hardness measuring instrument comprises a measuring terminal 1 and a sensing device 2, wherein the sensing device 2 is installed at the lower end of the measuring terminal 1; wherein the measuring terminal 1 comprises a key 11, a display screen 12 and a base 13, and the sensing device 2 comprises a protective cover 21 and a measuring pin 22.
The measuring terminal 1 is provided with a key 11, a display screen 12, a base 13, a processor and a pressure detection circuit, related detection parameters can be set through the key 11, and a detection result is displayed through the display screen 12, the processor and the pressure detection circuit (including a pressure detection element, namely a strain gauge, which is not shown in the figure) are arranged in the measuring terminal 1, the processor is internally provided with detection parameters and a detection program, and detected data can be calculated and stored; the outer wall of one end of a base 13 at the bottom of the measuring terminal 1 is provided with an external thread, and the other end of the base is connected with a strain gauge inside the measuring terminal 1.
The sensing device 2 comprises a protective cover 21 and a measuring pin 22. The protective cover 21 is of a hollow cylindrical structure, one end (head) of the measuring needle 22 is of a conical structure, and the taper is 30-75 degrees, preferably 40-70 degrees; the height of the cone is 3-13 mm, preferably 4-11 mm (specifically, the taper of the measuring needle can be 35 °, 38 °, 45 °, 48 °, 50 °, 55 °, 58 °, 60 °, 65 °, 68 °, and the like, and the height of the cone can be 3.8 mm, 4.0 mm, 4.5 mm, 4.8 mm, 5.5 mm, 5.8 mm, 6 mm, 6.5 mm, 6.8 mm, 7 mm, 7.5 mm, 7.8 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, 10.5 mm, 11.5 mm, 12 mm, 12.5 mm, and the like), and the other end (tail) is provided with an internal thread and is connected with the base 13 through a thread structure, the measuring needle 22 penetrates through the inside of the protective cover 21 and extends out of the bottom 23 of the protective cover 21, and the effective length of the measuring needle (i.e., the length of one end of the measuring needle extending out of the bottom 23 mm of the protective cover) is 3-9 mm, preferably 4-8 mm; illustratively, the stylus effective length can be 3.5 millimeters, 3.8 millimeters, 4.5 millimeters, 4.8 millimeters, 5 millimeters, 5.5 millimeters, 5.8 millimeters, 6 millimeters, 6.5 millimeters, 6.8 millimeters, 7 millimeters, 7.5 millimeters, 7.8 millimeters, 8.5 millimeters, 8.8 millimeters, and the like.
The measurement principle of the application is as follows: under the action of horizontal thrust, all the measuring pins 22 extending out of the protective cover 21 are pressed into the yarn ball, resistance borne by the measuring pins 22 is transmitted to a strain gauge (piezoresistor) in the measuring terminal 1 through the base 13, resistance value change data of the strain gauge piezoresistor is combined with a pressure detection circuit to obtain a detection current and/or voltage signal, the detection current and/or voltage signal is transmitted to a processor, data displayed by a display screen (namely the maximum load force borne by a yarn ball hardness measuring instrument in the testing process) is recorded after the number on the display screen tends to be stable, the measured data is substituted into a corresponding calculation formula, and then the hardness value of the measured yarn ball is calculated.
The hardness calculation formula of the yarn group in the embodiment of the application is as follows:
H=（N/Smax）*L0.5*tan（θ）=｛N/【π*（L*tan（θ/2））2】｝*L0.5*tan（θ）
wherein H is the yarn ball hardness;
n is the maximum load borne by the yarn ball hardness measuring instrument in the testing process, and the unit is Newton (N);
Smaxthe maximum cross-sectional area in square millimeters (mm) for measuring the effective length of the stylus during the process2）；
L is the effective length of the measuring needle in millimeters (mm) in the measuring process;
theta is the stylus taper in degrees (°);
the above equation is obtained by the applicant according to the data measured by numerous tests, and the following table shows the corresponding relationship condition of part of the test data:
table 1: example part test data correspondence table
The embodiment of the application also discloses a method for measuring the hardness of the yarn group by using the yarn group hardness measuring instrument, which comprises the following steps:
s1, respectively detecting a series of yarn balls with standard hardness or hardness standard products (for example, 0-500N is divided into a plurality of grades of hardness, and each grade of hardness is measured by the yarn ball with the standard hardness or the hardness standard product of the grade) by using the yarn ball hardness measuring instrument of the embodiment to obtain a yarn ball hardness calculation formula of the application;
s2, placing the sample yarn group on a clean plane for fixing, and taking down the packaging film (bag) of the part to be measured;
s3, starting the yarn cluster hardness measuring instrument according to 'ON/OFF', and setting 'peak' → 'zero setting' in sequence for initialization;
s4, one hand is propped against one side of the yarn cluster, the other hand holds the yarn cluster hardness measuring instrument and aims the measuring needle 22 at the yarn intersection at the vertical center of the side face of the other side of the yarn cluster, the measuring needle 22 which extends out of the protective cover 21 is pressed into the yarn cluster at a constant speed and forcefully until the number on the display screen does not jump (reaches the peak value), and the obtained measured value is recorded;
and S5, measuring the horizontal level of the sample at different points distributed at intervals of at least 5cm, and taking the average value of the measured values as an average measured value.
And S6, taking the average measured value in the step 5 as a measured value, and calculating the hardness value according to the corresponding equation of the measured value in the step one and the hardness.
In step S2, the sample should be removed from the packaging bag, and the sample should not have defects such as mechanical damage and impurities.
In step S4, the needle 22 extending out of the protective cover 21 is pressed into the yarn group at a constant horizontal speed during measurement, and the needle 22 is not pressed into the yarn group.
In step S5, the measured yarn mass is measured once at each of 3 or more points having the same height on the circumferential surface and distributed at the same distance, and the average of the measured values is taken to obtain an average measured value, which may be, for example, 3, 4, 5, 6 or more. As shown in FIG. 3, there are 5 measurement points, A/B/C/D/E respectively.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the present specification and directly or indirectly applied to other related technical fields, are intended to be included within the scope of the present application.
Claims (6)
1. A yarn ball hardness measuring instrument is characterized in that: including measurement terminal and sensing device, measurement terminal includes button, display screen, base, pressure measurement circuit and treater, and the treater is all connected with button, display screen, pressure measurement circuit, the pressure detection component of base and pressure measurement circuit be connected, sensing device includes safety cover and measuring pin, measuring pin one end stretch out after passing the safety cover inside, the measuring pin other end and pedestal connection, the safety cover is installed on measurement terminal, the measuring pin head be the toper structure.
2. The yarn package hardness measuring instrument according to claim 1, wherein: the measuring pin extends out of the bottom surface of the protective cover by 3-9 mm, and the height of the conical structure at the head of the measuring pin is not less than the distance of one end of the measuring pin extending out of the bottom surface of the protective cover.
3. The yarn package hardness measuring instrument according to claim 1, wherein: the measuring needle is connected with the base through a threaded structure.
4. The yarn package hardness measuring instrument according to claim 1, wherein: the protective cover is of a hollow cylindrical structure.
5. The apparatus for measuring the hardness of a yarn package according to any one of claims 1 to 4, wherein: the taper of the head of the measuring probe is 30-75 degrees, and the taper height is 3-13 mm.
6. The yarn package hardness measuring instrument according to claim 5, wherein: the taper of the head of the measuring probe is 40-70 degrees, and the taper height is 4-11 mm.
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| CN201920418158.9U CN210604230U (en) | 2019-03-29 | 2019-03-29 | Yarn ball hardness measuring instrument |
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| CN201920418158.9U CN210604230U (en) | 2019-03-29 | 2019-03-29 | Yarn ball hardness measuring instrument |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109883862A (en) * | 2019-03-29 | 2019-06-14 | 巨石集团有限公司 | A kind of yarn group's qualimeter and its measurement method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109883862A (en) * | 2019-03-29 | 2019-06-14 | 巨石集团有限公司 | A kind of yarn group's qualimeter and its measurement method |
| CN109883862B (en) * | 2019-03-29 | 2024-04-05 | 巨石集团有限公司 | Yarn ball hardness measuring instrument and measuring method thereof |
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