DE2344649A1 - ARRANGEMENT FOR MEASURING A PHYSICAL SIZE, SUCH AS PRESSURE, PULL FORCE ETC., IN A TRACK - Google Patents

Description

Patent attorneys

Dipl.-ing. Helmut Missling 63 Giessen September 3, 1973

Dipl.-Ing. Richard Schlee Blsmarckstrasse 43

_. ... ο, phone: (0641) 71019

Dr.-Ing. Joachim Boecker

Allmänna Svenska Elektriska Aktiebolaget, Västeras / Sweden

Arrangement for measuring a physical size «such as Pressure, tensile force, etc. «, in one path

The invention relates to an arrangement for measuring a physical quantity, such as pressure, tensile force, etc., in one path, with several adjacent measuring devices, of which at least some of a part of the width of the web can be covered, with the output signals of the measuring device indicating organs or a common collecting organ for formation the mean value or another value composed of the output signals of the various measuring devices are fed.

Such measuring arrangements are already known, for example an arrangement on a strip rolling mill for measuring the strip tension distribution over the bandwidth (German patent specification No. 1 573 407). In this known arrangement, the distribution

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the strip tension across the strip width is measured by selectively scanning the strip pressure against the surface of a deflection roller installed in the rolling mill. The deflecting roller is divided into several sections axially one behind the other, each of which contains at least two pressure-sensitive zones which are arranged offset from one another in at least one axial surface. Each of these zones is provided with at least one pressure-sensing transducer mounted in the vicinity of the surface of the deflection roller. The transmitter emits an electrical output signal which is a puncture of the force with which the belt influences the assigned zone. The output signal mentioned is taken from the deflection roller and fed to the measuring equipment. The output signal is fed via suitable filter elements and a sensitivity regulator to an indicator for displaying the measured value in the zone in question, the measuring signal of which is fed together with measuring signals from other zones to a mean value image, the output signal of which is thus a measure, e.g. a measure of the mean value of the pressure of the belt is against the guide roller. Also, other measuring arrangements for measuring a physical quantity are transversely across a web already beka _n nt; a common problem with such measurement arrangements is as follows.

In Figure 1 above, a measuring roller 30 is shown, which of a

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2344648

Tape or a web 31 is passed «, the measuring roller is with several measuring organs (with pressure-sensitive zones and pressure-scanning sensors) provided, which are axially adjacent to each other Zones 1 to 8 are arranged along the roller 30. the The roller can be, for example, a deflection roller for a passing belt 31. What you can do in each zone 1 to 8, i.e. in wants to measure every measuring element is, for example, the

~ - τ?
stresso- ^, where ϊ ^{1 is} the measured tensile force in the zone

A ■

and A is the measuring surface which is even B ₁₇ 't when B _{77 is} the

Is ti

Width of a zone and t is the thickness of the strip., The various values for ο are then combined to form an average, but this average is not correct for the following reasons.

In the edge zones the measuring elements 2 and 7 are not completely covered, and since the 3? is divided by "a constant B" ο t, which is the same as for zones 3 to 6, you get a wrong ο. The tensile force measured here is distributed over an area that is smaller than B " " t. If that The mean value measured in the edge zones is fed to the mean value image, an incorrect mean value is obtained; an incorrect belt tension is also displayed for the edge zones.

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0 S 8; 3/0 8'4 3

The above problem is thereby solved according to the present invention solved that the measuring devices alternatively to correction value transmitter are switchable, which switchover is arranged so that it is carried out when the relevant measuring device is only partially covered by the web, the corrected output signal of this device being sent to the display element or the collecting element to generate the correct output signal, such as the mean value for compressive or tensile force at the spell is fed.

This provides a correction of the otherwise incorrect measurement values from the measurement zones in the edge areas of the strip . One can get a correct mean for the measured physical Preserved size, which of course not only needs to be pushing or pulling, but also of a different kind can. The following can be observed here.

The measured force is denoted by F. Β _Ί is a whole

j. <

Multiple of the zone width B " and is close to the total bandwidth B.

If Y were to be divided by the same constant that applies to measuring zones 3 to 6, errors would be obtained.

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The coverage width at the only partially "covered" measuring zones

BB ₁

is --!- . Here, B is the bandwidth and the number 2
2

refer to the number of edges. .
So F is for zones 2 and 7 with

χ = ( ^B - ^B 1) _β t

to be divided and not with B " _o t (see Figure 1). These
correct division is achieved by correcting the output signal «,

The invention is described below with reference to the attached schematic Drawing further explained. Show it:

Fig. 1 is a sketch that makes it easier to understand
should serve the above calculation and

2 shows an illustration of an embodiment of the invention.

30 is a measuring roller with 25 measuring zones in which measuring elements are arranged are, on this measuring roller 30 happens a tape or

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a web 31 which covers the measuring zones 6 to 20, wherein the zones 6 and 20 are only partially covered, which is why a correction for the output signals of the relevant Measuring organs is required.

In a measuring arrangement 32 it is determined whether the individual Measuring zones are completely or only partially covered. For completely covered (or up to about $ 90 covered) zones, a contact arrangement 33 switched on for the left part of the track 31, wherein, as can be seen from the drawing, for the Measuring zones 7 and 8 uncorrected measuring signals are passed on. The measuring zones 1 to 5 are completely switched off. The measuring organ the only partially covered measuring zone 6 is connected by the arrangement 32 to another contact arrangement 34, in which only contact 6 is closed.

The degree of coverage, i.e. the zone width in relation to the covered part of zone 6, is measured in arrangement 35, which also output signals from a transmitter 36 for the widths (web width and zone width) are fed.

Output signals of the contact arrangement 34 are a multi-

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Plikator 37 is filled in, to which correction signals are also fed. The corrected signal is a third contact orinung ^ 5 ^ ugeftihrt. The output signals of the contact arrangements 33 and 38 are fed to the display elements or any mean value images.

The arrangements 33, 34, 37 and 38 can be summarized under the name signal transfer member 39, the for one half of the web is provided while one for the other half of the railway a similar signal transfer— organ 40 can apply.

The output signals of the signal transfer devices 39 and 40 are fed to the display element and / or the mean value images for the measured physical quantity.

This gives you the opportunity to display the correct belt tension in the edge areas, regardless of the degree of coverage of the strip, as well as for exact averaging for webs of any width. Other compounds can also be used Signals are obtained which are not influenced by measurement errors at the edges of the web.

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Claims (4)

Claims t /1.j. Arrangement for measuring a physical quantity, such as Pressure, tensile force, etc., in one path, with several adjacent Measuring devices, at least some of which can be covered by part of the web width, the output signals of the measuring device display organs or a common collecting organ for the formation of the mean value or another a value composed of the output signals of the various measuring devices, characterized in that that the measuring devices can alternatively be switched to correction value transmitters (37), which switching is arranged so that it is carried out when the measuring device in question is only partially covered by the web (31), this being corrected Output signal of this device to the display organ or the collecting organ to generate the correct output signal, e.g. of the mean value for compressive or tensile force on the web (31) is supplied. 2. Arrangement according to claim 1 characterized by a Scanning element (32) for scanning the completely or partially covered measuring device which is arranged in such a way that it encompasses the measuring devices -9- 4 0 ä 8 1 j / 0 8 4 3 can connect to the correction value transmitter (37), the are only partially covered by the web (31), "for example by the edge regions of the web. 3. Arrangement according to one of the preceding claims, characterized by a device (35) for measuring the degree of coverage of a measuring device, the output signal of the degree of coverage iießgerätes (35) gives the necessary correction. 4. Arrangement according to one of the preceding claims, characterized by two signal transfer organs (39, 40) for measuring devices on the right and left edge of the web, their output signals display devices and / or mean value images are fed. η 0 υ. ^: . '■:, / r, 8 4 3 ■ Blank page