DD151225A5 - MEASURING DEVICE OF LINEAR DENSITY OR MEASURING EQUALITY OF TEXTILE INDUSTRIAL PRODUCTS, ESPECIALLY OF THREAD CHANGERS - Google Patents

Abstract

The measuring device for measuring the linear density or the mass inequality of textile semi-finished products, in particular of fiber ribbons, contains a pneumatic test unit, a pneumatic electrical signal converter and an evaluation unit. The pneumatic test unit is equipped with elements which, apart from the linear density or mass inequality of the test piece, are suitable for eliminating all parameters influencing the result of the measurement, namely a throttle valve inserted in the mast air duct, and an opening d. Mantle surface of the measuring funnel used insert body, which is designed to be movable with respect to the track of the Prueflinges provided. The electrical evaluation unit contains such elements which are suitable for sensing the change in the pressure of the measuring air line, for processing the signals and for the digital display of the respective titer of the goods.

Description

22 U 19

Berlin, September 5, 1980 57 588 13

Measuring device for measuring the linear density or the mass inequality of textile semi-finished products, in particular of thread belts

Field of application of the invention

The invention relates to a measuring device for measuring the linear density or mass inequality of textile semi-finished products, in particular Eadenbändern, which is provided with a pneumatic Prufeinheit toad with an electrical evaluation unit, wherein between the pneumatic test unit and the electrical evaluation unit, a pneumatic signals in inserted in the testing station, a measuring hopper with certain pneumatic resistance, a feed air duct for the transport of the under pressure p. stationary feed air to the test point, a Meßluftleitung, which is connected to the feed air advantageously by a throttle valve and opens into a lateral surface of the measuring funnel and a port which passes the pressurized air P ₂ standing Meßluftleitung from the Meßluftleitung to the signal converter, the measuring funnel with a larger inlet cross-section and in comparison with a smaller outlet cross-section, wherein the test specimen, z. B. a sliver, is moved in the measuring hopper in the axial direction of the inlet cross-section in view of the outlet cross-section.

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Characteristic of the known technical solutions

The production of textile semi-finished fiber slivers takes place on production lines. An indispensable condition for high quality yarns is the constant or at least within a certain tolerance range remaining linear density of the slivers. The term "linear density" is understood to mean the measured value of a unit of length of the product, if appropriate the sliver, given in weight unit.

In order to limit the linear density of the fiber ribbons, two methods are known. The one known method is based on the continuous measurement of the linear density of the slivers in the individual members of the machine series and continuous control or readjustment under constant monitoring of the measurement results.

After the other known method samples are taken from the manufactured slivers during manufacture. The samples are checked by personal weight and length measurement, after which the control or readjustment of the machine on the basis of the results obtained again done with a handy intervention.

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The main disadvantage of the first mentioned method is that no information about the linear density of the manufactured slivers and their change in the longitudinal direction of the product for the expert is supplied, and the expert must supplement the measurement results with his professional experience to the corresponding To be able to perform intervention for regulation.

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The first method is also unfavorable because the control elements that make up the parts of the machine series or are assigned to these parts are inclined to failure or adjustment. Therefore, the random monitoring used in the usual carding and drafting systems can not be omitted even with this method.

The two most important drawbacks of the second method are, on the one hand, the considerable length of time required to carry out the procedure and, on the other, the possible subjective measurement errors in length measurement and weight measurement, which can make the whole reliability of the interventions carried out on this basis questionable.

Thus, a continuous measurement and analysis of the linear density of the slivers would be desirable, and to accomplish this task, the measuring unit of the governing drafting units would appear to be most suitable. Therefore, the measuring unit of the controller based spinning control equipment has been used because it provides proportional signals with the linear density.

However, the measurable linear density shows the resulting linear density of entering into the drafting bands and is due to the stochastic character of the stretching process for evaluation of the sought parameters of the slivers, but especially for the realization of the intervention only indirectly and in the long term suitable. In addition, reliable measurement results are achieved only when the operation is free of fractures, so-called false dilations, d. H. is completely trouble-free.

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5. -9. 1980 57 588 13

In another solution, a pneumatic funnel was used for this purpose, with the help of which the linear density, the slivers is measured in the provided with technical control devices machines spinning after the completed working phase.

However, the pneumatic funnel is only suitable for plotting the sign of the deviation from the mean or the tendency of the deviation and not for registering the absolute value of the deviation. The otherwise expedient and simple method could not spread so far, because the so-called "funnel characteristic" - d. H. the real relationship between the funnel's pneumatic resistance and the desired linear density - depends on several parameters.

The measurement can only be the. Show overall effect of these parameters. These parameters include the dimensions and geometrical design of the hopper, the nature of the material, the moisture content and the arrangement of the elementary fibers, the pressure of the feed air and possibly also other conditions.

Object of the invention

The aim of the invention is the development of a device that makes the hitherto technically not reliably feasible funnel measurement in practice so used that the measurement and analysis of the linear density of the slivers with their help continuously d. H. without turning off the technological machine - can be performed.

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5. 9. 1980 57 588 13

Explanation: the nature of the invention °;

The invention has for its object to provide a measuring device for measuring the linear density or mass inequality of textile semi-finished products, in particular of thread belts, in which the change of the funnel characteristic is carried out in such a way that is proportional to the respective real linear density of the slivers, numerical signal is generated, which can be processed by a suitably assigned evaluation unit.

The object is achieved in that the pneumatic test unit with elements that are apart from the linear density or the mass inequality of the DUT for elimination of all the result of the measurement influencing .Parameters are suitable, namely with an inserted into the Meßluftleitung throttle valve for control and with an inserted into an opening of the lateral surface of the measuring funnel insert body, with respect to the track of the specimen, z. B. the sliver, is designed to be movable, and the electrical evaluation unit contains such elements which are suitable for detecting the change in the pressure of the Meßluftleitung, for processing the signals and the digital display of the respective titer of the goods. ,

In one embodiment of the measuring device according to the invention, the measuring funnel as a in the direction of movement of the specimen, z. B. the sliver, narrowing rotating body executed, the end of the kl one "bsi diameter by a cylindrical

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Ansatz'verlängert is.

According to the invention, it is useful for the Meßluftleitung when it opens into the approach of the measuring funnel and the throttle valve, which is inserted and controlled in the Meßluftleitung, advantageously in the range of the measuring funnel is arranged.

For the opening, it is advantageous if it is arranged for the insert body in the region of the outlet cross-section of the lateral surface of the measuring funnel.

Another embodiment of the invention is characterized in that the insert body is provided in the direction of the web and the movement of the Easerbandes with an outlet cross section of the measuring hopper adapting curvature

It is also expedient if the limiting surface of the insert body facing the inlet cross-section of the measuring funnel is embodied as a paraboloid.

The electrical evaluation unit of the measuring device according to the invention is designed so that it generates a signal generator that generates the analogous with the speed of incoming goods from a textile goods and analog voltage signals, a clock generator that controlled by the voltage signals of the signal generator and in this way by the speed of the goods provides specific clock with one of the goods to be measured fundamental frequency associated fundamental, an analog / digital converter for converting

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5. .9. 1980 57 588 13

of the analog signals into a pulse number information corresponding to the clock generator, and a control unit for setting the number of sampling.

The electrical evaluation unit can also be characterized in that it is provided for the statistical evaluation and classification of the measured data with a data processing unit.

It is furthermore advantageous if the data processing unit contains an information-receiving, storing and evaluating elements, advantageously program-processing arithmetic subunit.

The data processing unit is advantageously provided with a digital data display for the measurement results.

Finally, according to the invention, it is advantageous if an alarm display for readjusting the technological machine and optionally an interface unit connected to a computer is connected to the control unit directly or by the data processing unit.

The largest advantage resulting from the measuring device according to the invention is the possibility of increasing the titer of the semi-finished textile product, e.g. B, a sliver, without having to turn off the continuously operating machine or remove samples from the machine. The determined titer is immediately displayed digitally by the electrical evaluation unit of the device.

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From this arises the possibility of the constant overcoming of the linear jjicno «ozw. the mass inertia and thus the analysis of the working quality of the machines of the spinning mill which can be carried out with the computer in the center.

The advantages of the measuring device arise from the fact that the pneumatic test unit excludes all except the linear density and the mass inequality of the test specimen influencing the result of the measurement parameters. The most important of these parameters is the speed change of the progressive movement of the goods or their effect. This is eliminated by always the same - d. n. Comparable - goods lengths are compared.

Another advantage of the invention results from the fact that the device and the measurement of such characteristics of the goods, for. B. the average linear density of the 1000 m long bands, enabled, the measurement of which could not be performed previously. The test method with the measuring device according to the invention improves, albeit only indirectly, the quality or the balance of the quality of the product.

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5. 9. i960 57 588 13

Aiisführungsbeispiel

In the following the invention will be explained in more detail of embodiments in conjunction with the drawings. Show it:

Fig. 1: the pneumatic test unit of the measuring device according to the invention in side view, partly in section;

Fig. 2: the lower part of the pneumatic test unit of the device according to the invention in section;

3 shows a part of the insert body of the pneumatic measuring funnel in plan view;

4 shows the electrical evaluation unit of the pneumatic test unit in the block diagram.

The main parts of the measuring device according to the invention are a pneumatic test unit I, an electrical evaluation unit II and between these a signal converter III, which converts the pneumatic signals of the pneumatic test unit I into electrical signals.

From Fig. 1. The elements of the pneumatic test unit I can be seen. From a compressor or storage tank, not shown in Fig. 1, the feed air flows at a pressure p. by a feed air line 1, from which the feed air in a Meßluf tls itung 'd as measuring air with a pressure po is passed. Between the feed air line 1 and the Meßluftieitung 2 is

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5. 9. 1980 57 588 13

a throttle valve 3 is inserted. As a result, the desired pressure P2 can be established. The measuring air line 2 opens into a measuring funnel 4 with e inem terminal 5, through which the measuring air passes with a pressure p £ in the signal converter in order to transform the change in the pressure Po into electrical signals can.

The measuring funnel 4 is a structure of conical shape, through the lateral surface 4a of a 4b of an inlet cross-section in the seal of an outlet cross-section 4c constantly narrowing interior space is determined. The measuring funnel 4 may be provided with a projection 4d which, in contrast to the conical lateral surface 4a, has a cylindrical lateral surface, that is to say an unchanging inner space.

From the technological machine, so z. ß. sliver 6 descending from a carding or drafting device moves in the interior of the measuring funnel 4 from the inlet cross-section 4b in the direction of the outlet cross-section 4c or the projection 4d. The measuring air line ά is expedient not directly, but connected by a throttle valve '/ with the interior of the measuring funnel 4. This orifice is arranged in the region of the outlet cross-section 4d, advantageously at the distance of the projection 4d.

Opposite the mouth of the throttle valve '/ is ein .einsatzkörper ^ in the region of the outlet cross-section BS 4c of the measuring funnel 4 advantageously arranged perpendicular to the direction of movement of Jj'aseroandes 6 movable.

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As a result of movement, the greater or lesser part of the outlet cross section 4c of the measuring funnel 4 can be covered, so that the degree of "congestion" can be increased from the inside cross section 40 to the outlet cross section 4c in the measuring section.

from -b'ig. 2 shows an embodiment in which the cylindrical projection 4d is connected to the lateral surface 4a of the measuring funnel 4. In this case, the Meßluftte tion 2 of the measuring air opens with a pressure P2 in the interior of the measuring funnel 4 in the region of this approach 4d. Of course, the opening 8 for the insert body 9 is also in the region of the projection 4d. ',

In both embodiments, it is expedient if the boundary surface with respect to the inlet cross-section 4b of the measuring funnel 4 paraboloidähnlich, wherein the insert body 9 in the direction of movement of the sliver 6 vertical top view, as shown in Figure 3, is formed. This means that the insert body is provided in this plan view with a curvature 9 a, whose concave central distance is adapted to the shape and dimension of the outlet cross-section 4 c of the measuring funnel 4. As a result, the insert body 9 causes no jam in the one end point, since here the full 'Kundquerschnitt the outlet cross-section 4c is free. In the case of the stepwise approach of the insert body 9 to the track line of the chamfer band 6, the cross section of a circle is increasingly distorted to form a circle segment.

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From Fig. 4, the basic structure of the electrical evaluation unit II is shown in the block diagram. From the textile semi-finished textile manufacturing institution, eg. ß. a card or a drafting system, the manufactured goods come down with a certain speed of movement. The proportional to this speed analog voltage signals are generated by a signal generator 11, so these signals are clearly characteristic of the speed of the manufacturing machine.

The signal generator 11 is associated with a clock generator 12, which actually serves to determine the frequency of the sampling. The clock generator provides the sampling cycle that increases at a faster machine speed and vice versa.

The electrical evaluation unit further includes an analog-to-digital converter 13 which converts the analog signals supplied by the clock generator 12 into digital signals and forwards them to a gate circuit 14. The information flow through the gate 14 can be temporarily interrupted by a control unit 16, which now gives a data processing unit 15 an instruction for the reception and processing of the information.

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The measured data is received, compared and classified by the data processing section 15. Due to the classification, the errors are subdivided into iterations, and their number of pieces and possibly their size are superimposed on each other.

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The same data processing unit 15 is also suitable for the detection of the frequency and the dispersion of the Dehler.

The work of the data processing unit 15 with arithmetic functions is closely related to the work of the control unit 16. This control unit 16 counts the number of times of sampling, triggers the gate 14, completes the averaging, and gives instructions to the data processing unit 15 to complete the desired tasks.

The data processing unit 15 can accomplish the above-mentioned objects provided with such elements as are suitable for receiving, storing and processing the information coming from the signal generator 11 through the A / D converter 13, and advantageously to a common program processing subunit 15a assembled. The data processing unit 15 is also provided with a data display 1i-b, with the aid of which the measurement results can numerically be controlled constantly numerically.

The electric ·. Evaluation input II may - but not necessarily - be supplemented by an alarm indicating the eventual readjustment of the tecunological machine and by an interface unit 17 which may be connected directly to the control unit 16 or directly through the data processing unit 15 ,

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5. 9. 1980 "57 588 13

As can be seen above, the frequency of sampling by the clock generator 12 is generated in itself by the measuring device according to the invention or the speed of the goods according to and transformed to the signals of the signal generator 11 transformed. This is necessary so that the length of the sampling is always the same. Thus, the results become commensurable (comparable to each other).

This comparability of the measurement results emphasizes the importance of the measuring device according to the invention - and in principle suitable for measuring the textile semi-finished products of all kinds. .For the product characteristic titer / dimension: length / weight / or linear density / dimension: weight / length / can be determined with the help of this measuring device onne decrease of the product sample by the machine changes. The sought values are displayed digitally by the data display 15b of the data processing unit 15, to the exclusion of the influence of the possible change in speed by the comparison of constantly equal - ie commensurate - goods lengths.

Claims (11)

-15- 2 2 14 19 1. Measuring device for measuring the linear density or mass inequality of textile semi-finished products, in particular of thread bands, which is provided with a pneumatic Prüfeintieit and with an electrical evaluation unit, wherein between the pneumatic test unit and the electrical Äuswertungseinneit a pneumatic signals into electrical signals transforming signal converter inserted, the pneumatic test unit attached to the test point Funnel with certain pneumatic resistance, a feed air line for the transport of the pressurized feed air to the test, a Meßluftleitung which is connected to the feed air advantageously by a throttle valve and Ih a lateral surface of the measuring funnel. opens and a connection, the weiterergiot the measuring air under pressure from the Meßluftleitung to the signal converter, deüäit, the measuring funnel with a larger ü 'is designed intrumentsquerscnnitt and in comparison with a smaller outlet cross-section, wherein the test specimen, ζ. ΰ. a sliver in which the funnel is axially displaced from the entry cross-section in the direction of the exit cross-section, characterized in that the pneumatic inspection unit (1) is designed to eliminate all but the linear density or mass inequality of the specimen the parameters influencing the measurement are suitable, namely with a throttle valve (7) inserted into the measuring air line (2) for -16- 22 14 19 2 2 14 19 2. Measuring device according to Pun & t 1, characterized in that the measuring funnel (4) as a in the direction of movement of the Prüf.linges, z. B. the Easerbandes (6) is narrowing rotary body, is executed, wherein the end of the smallest diameter by a cylindrical extension (4d) is extended. 3 measuring device according to item 1 or 2, characterized in that the measuring air line (2) in the approach (4d) of the measuring funnel (4), and the throttle valve (7) »inserted and controllable in the Meßluftleitung (2), vorteilhaf -termally in the region of the measuring funnel (4) is arranged. 4. Measuring device according to the points 1 to 3i, characterized in that the opening (8) for the insert body (9) in the region of the outlet cross-section (4c) of the lateral surface (4a) of the measuring funnel is arranged. 5. 9. 1980 57 588 13 5. 9. 1980 57 588 13 Vaulting (9a) is provided. 5. Measuring device according to item 1, characterized in that the insert body (9) in leasing the web and the movement of the sliver (6) with a the outlet cross-section (4c) of the measuring funnel (4) adapting Vi 7- 2214 19 5 · 9. 1980 57 588 13 gelling and with an inserted into an opening (8) of the Mantelfläcne of the measuring funnel (4) insert body (9), with respect to the path of the specimen, z. B. the tfaserbandes (5), is designed to be movable, and the electrical evaluation unit (II) contains such elements for detecting the change in the pressure (P2) of the Meßluftleitung (2), for processing the signals and the digital display the respective titers of the goods are suitable. 5. 9. 1980 57 588 13 Claim 6. Measuring device according to point 5 »characterized in that the inlet cross section (4b) of the measuring funnel (4) facing boundary surface of the insert body (9) is designed as a paraboloid, 7. A measuring device according to item 1, characterized in that the electrical evaluation unit (II) generates a signal generator (11) which generates the voltage signals proportional to the speed of the goods arriving from a textile machine and analog voltage signals, a clock generator (12) by the Voltage signals of the signal generator (11) controlled and thus determined by the speed of the goods clock with one of the goods to be measured fundamental frequency supplied, an analog / digital converter (13) for .Converting the analog signals into a Impulszanl information corresponding to Clock generator (12) and a control unit (16) for adjusting the number of sampling contains. 8. Measuring device according to point 7 »characterized in that a data processing unit (ifj) is provided for the statistical evaluation and classification deT measurement data. 9. Measuring device according to item 8, characterized in that the data processing unit (15) contains the information receiving, storing and evaluating Siesente, advantageously, a program-processing arithmetic subunit (15s.). 10 measuring device according to item 8 or 9, characterized in that the data processing unit (15) is provided with a digital data display (15 &) for the measurement results. 11. Measuring device according to the points 7 to 10, characterized in that directly to the control unit (16) or by the data processing unit (15) an alarm display and optionally an interface unit are connected » For this j * L "pages drawings