GB2154164A

GB2154164A - Winding apparatus for strips of a metal band divided longitudinally in a splitting unit

Info

Publication number: GB2154164A
Application number: GB08502136A
Authority: GB
Inventors: Helmut Leesmann; Wilfried Koepe
Original assignee: SUNDWIGER EISEN MASCHINEN; Sundwiger Eisenhutte Maschinenfabrik Grah and Co
Current assignee: SUNDWIGER EISEN MASCHINEN; Sundwiger Eisenhutte Maschinenfabrik Grah and Co
Priority date: 1984-02-15
Filing date: 1985-01-29
Publication date: 1985-09-04
Also published as: JPS60191952A; DE3405246C1; FR2559406A1; GB8502136D0

Abstract

Strips 3 of a hot-rolled or cold-rolled metal band are wound firmly onto a reel 6, insert strips being wound into the coils of the individual strips by a feed device 7 to compensate thickness differences in the individual strips 3. The feed device 7 receives control commands from a measuring instrument 9 which detects the band tension or the sag of the individual strips and which causes more or less long insert strips to be wound in via the feed device 7 as a function of the band tension or the sag, so that the individual coils are wound with uniform firmness. <IMAGE>

Description

SPECIFICATION Winding apparatus for strips of a metal band divided longitudinally in a splitting unit This invention relates to an apparatus for winding strips of a hot-rolled or cold-rolled metal band divided longitudinally in a splitting unit onto a reel, with a feed device for fillers, especially insert strips, which are wound in between the layers of a coil of a strip by the feed device in response to a control command.

During the rolling of a metal band, a varying band thickness is obtained over the width of the band. When such a band is split into strips and these strips are then wound together in parallel onto a reel to form coils, coils wound with varying firmness are obtained for the individual strips.

In a known winding apparatus for the strips of the longitudinally split metal band every individual strip is maintained under tension by a braking device located in front of the reel, so that every coil is wound with an essentially equal firmness. However, such tension can be exerted on the part strips only when the material in question has an insensitive surface. In so far as the material has a sensitive surface and the braking device therefore cannot be used, intermediate layers consisting of a filler, especially insert strips, are wound into the individual coils from time to time to compensate the thickness tolerances, so that all the part strips can be wound under a uniform tension. The moment when the insert strips are wound in and the winding-in period are determined by the attendant who checks the part strips for sagging.

Such monitoring and control of the winding-in of insert strips is unsatisfactory, because it is not possible to ascertain early enough when one part strip is being wound more loosely than the other part strips.

The object on which the invention is based is to improve the apparatus of the type mentioned in the introduction, in such a way that fluctuations in tension in the part strips are as little as possible during winding.

According to the invention, in the specified apparatus for winding the strips the control command is supplied by a measuring instrument which measures the tension and/or the sag of each part strip immediately in front of the reel.

In this solution, a coil wound with uniform firmness is guaranteed for each strip because the feed device for the filler winds in the filler even when the tension decreases only slightly, so that the normal tension builds up again.

According to a first embodiment of the invention, the measuring instrument is designed as a roller which extends over the entire width of the band subdivided into strips and which has in its casing pressure gauges for each strip.

In such a measuring instrument known per se, decreasing band tension is a precondition for the feeding of a filler. The more sensitively the measuring instrument detects this band tension, the less the fluctuations which occur during the firm winding of the strip in the coil. However, the more sensitively the measuring instrument supplies control demands to the feed device, the more frequently the feed device is activated. In practice, therefore, a compromise will be selected between the sensitivity of the measuring instrument and the number of times the feed device is activated, without thereby producing large differences in the band winding firmness.

These problems do not arise in an alternative embodiment which is characterised in that there is for each strip a pressure-loaded roller which maintains the strip under tension as a result of deflection, the measuring instrument supplying the control command as a function of the deflection of the strip. In such an apparatus, there is no fluctuation at all in the winding firmness, since the band and the part strip are maintained under uniform tension because the roller is subjected to pressure.

Nevertheless, the feed device is not activated too frequently. Only when a predetermined sag is obtained is the feed device activated and maintained activated until the deflection is zero again.

Whereas, in the first alternative solution, the feed device must react immediately after a difference between the desired and actual values of the band tension has been detected, in a second alternative solution, because of the roller maintaining the band under tension, sufficient time remains to execute the control command supplied to the feed device.

In the accompanying drawings; Figure 1 shows a side view of the apparatus for winding on part strips of a longitudinally divided band, Figure 2 shows a side view of an apparatus for winding on the part strips of a longitudinally divided band in the design different from that of Figure 1, and Figure 3 shows a side view of a roller maintaining the part strips under tension, together with a measuring instrument.

Referring to the drawings, the cold-rolled or hotrolled band 1 wound on a reel is divided into parts strips 3 in slitting shears consisting of pairs of cirular knives 2. The strips 3 travel via supporting rollers 4, 5 to a reel 6 where they are wound on in parallel to form individual coils. In the wedgeshaped gap between the freely guided part strips 3 and the reel 6 there is a feed device 7 for filler, for example insert strips. By means of such a feed device, insert strips can be fed individually for a predetermined time to the individual coils of the part strips 3. Such feed devices are known (German Utility Model 8,006,563; German Offenlegungsschrift 2,435,142; German Patent Specification 2,838,563).The feed device receives control commands from a measuring instrument still to be described, in such a way that more or less filler is wound into the individual coils, so that the winding diameter is more or less the same for all the coils.

The winding tension is then also the same in such coils.

In the exemplary embodiment of Figure 1, the measuring instrument consists of a measuring roller 8 arranged above the part strips 3 between the supporting rollers 4 and 5. This measuring roller carries in its casing a plurality of pressure gauges which measure the band tension individually for each part strip Such measuring rollers are known (German Offenlegungsschrift 2,630,410).

The measuring device 8 supplies a control command to the feed device 7 as a function of the result of measurement for an individual strip, so that the feed device 7 is activated for the corresponding strip on which too low band tension has been detected. The feed device supplies filler to be wound in, until the desired band tension has been restored.

In the exemplary embodiment of Figure 2, the measuring instrument has a plurality of individual rollers 9 which are arranged between the supporting rollers 4, 5 and on the side of the strips 3 which is located opposite the supporting rollers 4, 5. Such a roller 9 is assigned to each strip 3. The roller 9 is subjected to pressure and maintains the associated strip 3 under constant tension because the latter is deflected. The amount of deflection is detected by a measuring element 10 of the measuring instrument. When a predetermined value is reached, the measuring instrument supplies a control command to the feed device 7. The filler is wound in until the measuring element has reached its predetermined zero position again. To achieve uniformly firm winding, in the exemplary embodiment of Figure 2 filler needs to be wound in less frequently than in the exemplary embodiment of Figure 1. In spite of this, however, there is no decrease in the band tension during the time between the individual winding-in operations, because the roller subjected to pressure maintains the band tension. The loop formed by the roller 9 thus acts as a band reserve.

Claims

1. Apparatus for winding strips of a hot-rolled or cold-rolled metal band divided longitudinally in a splitting unit onto a reel, with a feed device for fillers, especially insert strips, which are wound in between the layers of a coil of a strip by the feed device in response to a control command, characterised in that the control command is supplied by a measuring instrument, which measures the tension and/or the sag of a part strip immediately in front of the reel.

2. Apparatus according to Claim 1, characterised in that the measuring instrument is designed as a roller which extends over the entire width of the band subdivided into strips and which has in its casing individual pressure gauges for the part strips.

3. Apparatus according to claim 1, characterised in that there is for each part strip a pressureloaded roller which maintains the strip under tension as a result of deflection, and in that the measuring instrument supplies the control command as a function of the deflection of the part strip.