CN112760759A - Method for simply and conveniently detecting doffer transfer rate by using evenness tester - Google Patents
Method for simply and conveniently detecting doffer transfer rate by using evenness tester Download PDFInfo
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- CN112760759A CN112760759A CN202011565046.XA CN202011565046A CN112760759A CN 112760759 A CN112760759 A CN 112760759A CN 202011565046 A CN202011565046 A CN 202011565046A CN 112760759 A CN112760759 A CN 112760759A
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- transfer rate
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
- D01G15/00—Carding machines or accessories; Card clothing; Burr-crushing or removing arrangements associated with carding or other preliminary-treatment machines
- D01G15/02—Carding machines
- D01G15/12—Details
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/15—Correlation function computation including computation of convolution operations
Abstract
The invention discloses a method for simply and conveniently detecting doffer transfer rate by using a evenness tester, which comprises the following steps: 1) collecting all the carded slivers output by the carding machine; 2) the raw strips in the first tray are inverted, a strip leveller is adopted to test the raw strips, and a non-uniformity curve chart of the raw strips is obtained; 3) randomly taking a point C at the downward moving section, and acquiring the ratio Z/W of the residual fiber quantity on the surface of the cylinder to the surface load of the cylinder in a balanced state when the point C is located, and the length L of the sliver output when the cotton feeding point is stopped to the point C; 4) calculating the doffer transfer rate at the point C according to the formulas (1) and (2): a ═ lg (Z/W)/[ L/(V/Nc)](1)；r＝1‑10a(2) (ii) a The doffer transfer rate testing device and the doffer transfer rate testing method utilize the function of the irregularity curve graph of the evenness meter, test and calculate the doffer transfer rate simply, conveniently and directly, are convenient to operate, and solve the technical problem that spinning enterprises cannot test the doffer transfer rate conveniently.
Description
Technical Field
The invention relates to the technical field of spinning quality testing, in particular to a method for simply and conveniently detecting doffer transfer rate by using a evenness tester.
Background
At present, no simple and easy carding machine doffer transfer rate testing method is available for textile enterprises in the industry, and no reliable testing instrument is available for directly testing and calculating the doffer transfer rate. At present, researchers generally use methods such as an additional fiber amount distribution method or a fiber strip cutting and weighing method to indirectly measure and calculate the doffer transfer rate when researching the doffer transfer rate.
The 'additional fiber amount distribution method' is that under the condition that the carding machine normally operates, a certain amount of colored fibers are fed in after the carding machine, and the doffer transfer rate is estimated by using a specific data model and a regression equation according to parameters such as the distribution length and the distribution amount of the colored fibers in output slivers.
The 'fiber strip cutting and weighing method' is that under the condition of normal operation of carding machine the cotton feeding and cover plate rotation are stopped, the tapered fiber strip output by doffer is collected, then cut and weighed according to 10cm, and according to the relationship of fiber quantity value transferred from cylinder to doffer the doffer transfer rate can be estimated by using mathematical statistical calculation method.
The methods have the defects of high operation difficulty, high technical requirement, poor repeatability, capability of being carried out only by accurately matching multiple persons and the like, and are difficult to adopt by textile enterprises.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for simply and conveniently detecting the doffer transfer rate by using a bar-leveller.
The technical scheme adopted by the invention is as follows:
a method for simply and conveniently detecting doffer transfer rate by using a evenness tester comprises the following steps:
1) and placing a first tray below a coiler of the carding machine, stopping feeding cotton by the carding machine, and collecting all the sliver continuously output by the carding machine after stopping feeding the front meristematic sliver and the sliver after stopping feeding, wherein the length of the partial sliver before stopping feeding is not less than 5 m.
2) And (3) placing the raw slivers in the first tray in a reverse direction on a second tray, testing the raw slivers by using a evenness tester, and obtaining an irregularity curve chart of the raw slivers, wherein the irregularity curve chart comprises a normal section and a downward moving section, and the intersection point of the normal section and the downward moving section is a cotton feeding stopping point.
3) Randomly taking a point C at the downward moving section, and acquiring the ratio Z/W of the residual fiber quantity on the surface of the cylinder to the surface load of the cylinder in a balanced state when the point C is located, and the sliver length L output when the cotton feeding point is stopped to the point C; wherein Z is the amount of fiber remaining on the surface of the cylinder at point C, and W is the surface load of the cylinder in an equilibrium state.
4) Calculating the doffer transfer rate at the point C according to the formulas (1) and (2):
a＝lg(Z/W)/[L/(V/Nc)] (1)
r＝1-10a (2)；
wherein r is doffer transfer rate, L is sliver length output from a cotton feeding stop point to a point C, V is sliver output speed of a carding machine, Nc is cylinder rotating speed, and Z/W is the ratio of residual fiber quantity on the surface of the cylinder at the point C to the surface load of the cylinder in a balanced state.
Further, in the step 2), the raw strips in the first tray are inverted, specifically: the tampon in the first tray is reversely buckled into the second tray.
Further, in the step 3), obtaining a ratio Z/W of the amount of fibers remaining on the surface of the cylinder at the point C to the surface load of the cylinder in a balanced state, specifically: and acquiring the ordinate of the point C, wherein the absolute value of the ordinate is the percentage of the amount of the fibers transferred to the doffer on the cylinder at the point C to the surface load of the cylinder in a balanced state, and Z/W is 1-the ordinate of the point C.
Further, in step 3), the sliver length L output from the cotton feeding point to the point C is obtained when the cotton feeding point is stopped at the point C, specifically: and acquiring the distance between the cotton feeding stopping point and the point C, wherein the distance is the length L of the sliver output from the cotton feeding stopping point to the point C.
Further, the step of obtaining the distance between the cotton feeding stopping point and the point C is specifically as follows: acquiring the abscissa of the cotton feeding stopping point and recording the abscissa as LA(ii) a The abscissa of the point C is obtained and is marked as LC(ii) a The distance between the cotton feeding stopping point and the C point is acquired to be LC-LA|。
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
Fig. 1 is a graph of the unevenness provided by the embodiment of the present application.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
The doffer transfer rate is the percentage of fibers transferred from the cylinder to the doffer to fibers that were in the cylinder before transfer, and represents the capacity of the cylinder to transfer fibers to the doffer.
When the carding machine starts to feed raw materials, the front cylinder rotates a few times to gradually absorb some fibers, the output sliver also changes from thin to normal fixed quantity, and after the normal production state is reached, the doffing quantity is also fixed, namely the fiber quantity output by the carding machine is in a certain proportion to the fiber quantity fed, namely the output fiber quantity is equal to the fiber quantity fed to reduce the doffing quantity. At this time, if the feeding of the raw material is stopped and the fiber on the cylinder is allowed to be freely transferred and output, the output raw sliver can be gradually thinned from the normal fixed quantity along with the decrease of the fiber quantity on the cylinder until no fiber is output finally. In this case, the raw strip is examined by a strip leveller, and a graph of the unevenness is obtained in which the unevenness is gradually reduced from a normal value.
The application provides a method for simply and conveniently detecting doffer transfer rate by using a evenness tester, which comprises the following steps:
1) and placing a first tray below a coiler of the carding machine, stopping feeding cotton by the carding machine, and collecting all the raw slivers which are continuously output before the feeding of the carding machine is stopped (not less than 5 meters) and after the feeding is stopped.
2) Reversely buckling the cotton sliver in the first tray into the second tray, and inverting the raw sliver to ensure that the normal quantitative raw sliver is on the upper surface and the thinned raw sliver is on the lower surface. Setting the measuring range of the unevenness curve chart of the evenness tester to be +/-100%, testing the evenness of the raw strips by using the evenness tester to obtain the unevenness curve chart of the raw strips (see figure 1), wherein the unevenness curve chart comprises an unevenness curve which comprises a normal section and a downward moving section, the intersection point of the normal section and the downward moving section is a cotton feeding stopping point, and the cotton feeding stopping point is marked as A.
The normal section is a curve fluctuating slightly from top to bottom on a line 0, and the curve is formed by testing normal quantitative raw strips; the stop cotton feeding point A begins, and the formed curve is a curve gradually moving downwards due to the gradual thinning of the raw cotton strips and is called a downward moving section.
3) Randomly taking a point C at the downward moving section, and acquiring the ratio Z/W of the residual fiber quantity on the surface of the cylinder to the surface load of the cylinder in a balanced state when the point C is reached, and the length L of the sliver output when the cotton feeding is stopped to the point C; wherein Z is the amount of fiber remaining on the surface of the cylinder, and W is the surface load of the cylinder in an equilibrium state.
The ratio Z/W of the amount of fiber remaining on the surface of the cylinder at the point C to the surface load of the cylinder in the equilibrium state can be directly obtained from a irregularity chart, specifically: and acquiring the ordinate of the point C, wherein the absolute value of the ordinate is the percentage of the fiber quantity which is transferred to the doffer on the cylinder at the point C to the surface load of the cylinder in the balanced state, and the ratio Z/W of the fiber quantity remained on the surface of the cylinder at the point C to the surface load of the cylinder in the balanced state is 1- | of the ordinate of the point C.
Since the abscissa of the irregularity chart indicates the length of the sliver, the length L of the sliver output from the stop of the cotton feeding point to the point C is the distance between the stop of the cotton feeding point and the point C.
In particular, the sit-down of the cotton feeding stopping point A is obtainedLabel, note LA(ii) a The abscissa of the point C is obtained and is marked as LC(ii) a Obtaining the distance L between the cotton feeding stopping point and the C pointC-LA|。
In an exemplary embodiment, a point C is taken at the descending section, the coordinate of the point C is [ -30%, 6.75], the coordinate of the intersection point a of the normal section and the descending section is [0,2.5], the ratio Z/W of the amount of fiber remaining on the surface of the cylinder at the point C to the surface load of the cylinder in the equilibrium state is 1-30-70%, and the length L of the sliver output when the feeding of the cotton point to the point C is stopped is 6.75-2.5 m-4.25 m. That is, at point C, the ratio Z/W of the amount of fibers remaining on the surface of the cylinder to the surface load of the cylinder in the equilibrium state was 70%, and the length L of the sliver discharged from the cotton feed stop point to point C was 4.25 m.
4) Calculating the doffer transfer rate at the point C according to the formulas (1) and (2):
a＝lg(Z/W)/[L/(V/Nc)] (1)
r＝1-10a (2)；
wherein r is doffer transfer rate (%), L is the sliver length output when stopping feeding cotton to a point C, the unit is m, V is the sliver output speed of the carding machine, the unit is m/min, Nc is the rotating speed of the cylinder, the unit is r/min, and Z/W is the proportion (%) of the residual fiber quantity on the surface of the cylinder at the point C to the surface load of the cylinder at a balanced state; where V and Nc are known parameters, obtainable from the parameters of the carding machine.
Equations (1) and (2) are derived from the following equations:
Z/W＝(W×qn)/W＝qn ①
wherein q is the ratio (%) of the amount of the fiber remaining on the needle surface to the amount of the fiber previously on the needle surface of the cylinder after each rotation of the cylinder, n is the number of rotations of the cylinder, Z is the weight of the fiber remaining on the cylinder after n rotations, and is given in units of g, and W is the surface load of the cylinder in a balanced state, and is given in units of g.
Logarithm is calculated on two sides of the formula (I), and the formula is obtained:
Lgq＝Lg(1-r)＝lg(Z/W)/n＝lg(Z/W)/(L/l)＝lg(Z/W)/[L/(V/Nc)]
order: a ═ lg (Z/W)/[ L/(V/Nc) ],
then Lg (1-r) ═ a, this gives: r 1-10a。
The evenness appearance is the detecting instrument that general spinning enterprise all had the configuration, and this application utilizes the irregularity curve graph function of evenness appearance, simple and convenient, directly tests, calculates the doffer transfer rate, convenient operation, and efficiency of software testing is high (only need a few minutes just can obtain the result alone), and labour saving and time saving has repeatable operability moreover, and data is accurate reliable, solves the difficult technical problem that spinning enterprise can't test the doffer transfer rate conveniently.
During testing, the doffer transfer rate calculated according to different Z/W values is not a fixed value, and the condition is caused on one hand because the weight (thickness) of the raw strip is unstable, certain randomness is inevitably generated when the weight of the raw strip is reflected to an irregularity curve chart, and certain errors are also inevitably generated in the measuring and calculating processes; on the other hand, the test method is deduced on the premise that the doffer transfer rate is constant, and actually, after cotton feeding is stopped, the fiber quantity on the needle surface of the cylinder is reduced along with the increase of the rotation number of the cylinder, and the doffer transfer rate is changed to a certain extent. Therefore, when the doffer transfer rate is detected by a evenness tester:
1) the point C is calculated by taking 4 points of 10%, 20%, 30% and 40% (i.e., 90%, 80%, 70% and 60% in Z/W, respectively) in ordinate to calculate the doffer transfer rate, and then taking the average of the 4 values as the final calculation result.
2) In order to improve the accuracy of measurement and calculation results, the length of the strip corresponding to each small grid on the abscissa of the unevenness curve graph is preferably made smaller during measurement.
3) In the testing and calculating process, if some data is found to be obviously abnormal, the result of the test should be abandoned and the test should be carried out again.
4) The determination method is simple and convenient to operate, and can be used for performing tests for many times in each test, and the average value of the tests is taken for many times so as to reduce the influence of accidental factors.
In this application, unless expressly stated or limited otherwise, the terms "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral combinations thereof; may be a point connection; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, systems, and techniques have not been shown in detail in order not to obscure an understanding of this description.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, system, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, systems, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (5)
1. A method for simply and conveniently detecting doffer transfer rate by using a evenness tester is characterized by comprising the following steps:
1) placing a first tray below a coiler of a carding machine, stopping feeding cotton by the carding machine, and collecting all the sliver continuously output by the carding machine after stopping feeding the front meristematic sliver and the feeding, wherein the length of the partial sliver before stopping feeding is not less than 5 m;
2) placing the raw slivers in the first tray in a reverse direction on a second tray, testing the raw slivers by using a evenness tester to obtain an irregularity curve graph of the raw slivers, wherein the irregularity curve graph comprises a normal section and a downward moving section, and the intersection point of the normal section and the downward moving section is a cotton feeding stopping point;
3) randomly taking a point C at the downward moving section, and acquiring the ratio Z/W of the residual fiber quantity on the surface of the cylinder to the surface load of the cylinder in a balanced state when the point C is located, and the sliver length L output when the cotton feeding point is stopped to the point C; wherein Z is the residual fiber amount on the surface of the cylinder, and W is the surface load of the cylinder in a balanced state;
4) calculating the doffer transfer rate at the point C according to the formulas (1) and (2):
a＝lg(Z/W)/[L/(V/Nc)] (1)
r＝1-10a (2)；
wherein r is doffer transfer rate, L is the sliver length output from the cotton feeding stopping point to the C point, V is the sliver output speed of the carding machine, Nc is the rotating speed of the cylinder, and Z/W is the ratio of the residual fiber quantity on the surface of the cylinder to the surface load of the cylinder in a balanced state.
2. The method for conveniently detecting the doffer transfer rate by using the evenness tester as claimed in claim 1, wherein in the step 2), the raw strips in the first tray are inverted, and specifically:
the tampon in the first tray is reversely buckled into the second tray.
3. The method for easily detecting the doffer transfer rate using a evenness tester according to claim 1, wherein in the step 3), the ratio Z/W of the amount of fibers remaining on the surface of the cylinder at the point C to the surface load of the cylinder in an equilibrium state is obtained, and specifically:
and acquiring the ordinate of the point C, wherein the absolute value of the ordinate is the percentage of the fiber quantity which is transferred to the doffer on the cylinder and the surface load of the cylinder in a balanced state when cotton feeding to the point C is stopped, and Z/W is 1-the ordinate of the point C.
4. The method for conveniently detecting the doffer transfer rate by using the evenness tester as claimed in claim 3, wherein in the step 3), the length L of the sliver output from the cotton feeding point to the point C is obtained when the cotton feeding is stopped at the point C, and the method specifically comprises the following steps:
and acquiring the distance between the cotton feeding stopping point and the point C, wherein the distance is the length L of the sliver output from the cotton feeding stopping point to the point C.
5. The method for conveniently detecting the doffer transfer rate by using the evenness tester as claimed in claim 4, wherein the distance between the cotton feeding stopping point and the point C is obtained by:
acquiring the abscissa of the cotton feeding stopping point, and recording the abscissa as LA;
acquiring the abscissa of the point C, and recording the abscissa as LC;
the distance between the cotton feeding stopping point and the point C is LC-LA.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105525406A (en) * | 2016-01-29 | 2016-04-27 | 威海魏桥科技工业园有限公司 | Mint fiber and cotton fiber blended yarn and spinning technology thereof |
| CN105714452A (en) * | 2014-12-02 | 2016-06-29 | 天津天纺投资控股有限公司 | Novel multihole hollow cotton yarn, fabric of novel multihole hollow cotton yarn and preparation process of fabric |
-
2020
- 2020-12-25 CN CN202011565046.XA patent/CN112760759A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105714452A (en) * | 2014-12-02 | 2016-06-29 | 天津天纺投资控股有限公司 | Novel multihole hollow cotton yarn, fabric of novel multihole hollow cotton yarn and preparation process of fabric |
| CN105525406A (en) * | 2016-01-29 | 2016-04-27 | 威海魏桥科技工业园有限公司 | Mint fiber and cotton fiber blended yarn and spinning technology thereof |
Non-Patent Citations (4)
| Title |
|---|
| 王兟等: ""梳棉机道夫转移率的基础研究"", 《纺织器材》 * |
| 王兟等: ""道夫转移率的测定和计算研究"", 《棉纺织技术》 * |
| 王学元: ""利用条干仪简便地检测道夫转移率的研究"", 《现代纺织技术》 * |
| 王学元: ""道夫转移率简易测算方法探讨"", 《中国纱线网》 * |
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Application publication date: 20210507 |