Method and apparatus for winding up metal strips onto a winding mandrel

Abstract

The invention relates to a method and an apparatus for winding up metal strips ( 2 ) onto a winding mandrel ( 3 ), which is arranged in a reeling shaft ( 1 ) and to which the metal strip is passed by a driver having a lower and an upper driver roller ( 5, 6 ), wherein a table ( 7 ) is provided underneath the metal strip ( 2 ) for guidance and a pivotable strip diverter and, adjoining the latter almost up to the winding mandrel ( 3 ), a pivotable shaft flap ( 11 ) are arranged above the metal strip. By measuring the strip tension in the reeling shaft, it is intended to regulate the driver in such a way that the running of the strip makes it possible for the metal strip to be wound up to form a coil with straight edges. To achieve this, the longitudinal tensile force exerted on the metal strip ( 2 ) by the driver is determined by means of a strip tension measuring device ( 13 ), which dips into the metal strip from above in the reeling shaft ( 1 ), and the measuring signal is passed to a driver regulating device ( 22 ) to control the running of the strip by the driver. In the case of an apparatus suitable for this purpose, the strip diverter is formed as a strip tension measuring device ( 13 ) which dips into the metal strip ( 2 ) from above and is provided with a diverter body, which has a rotatably mounted roller arm ( 16 ), carrying a roller ( 17 ) at its front end, wherein a force measuring means ( 20 ) that is connected in signalling terms to the regulating device ( 22 ) is arranged between the diverter body and the roller arm ( 16 ).

1 . A method of winding metal strips on a mandrel of a coiler to which the metal strips are conveyed by a feeder having a lower and an upper feed roller, a guide plate being provided under the metal strip, a pivotal strip guide and a pivotal upper guide plate downstream of the pivotal strip guide extending above the metal strip almost to the mandrel, wherein a strip-tension measurer engages downward into the coiler from above with the metal strip and determines the longitudinal tension exerted by the feeder on the metal strip and feeds an output corresponding thereto to a feeder controller. 
   
   
       2 . The method according to  claim 1  wherein the variation in thickness of the distribution of tension is determined by how much the measured support forces affect the suspension of the strip-tension measurer. 
   
   
       3 . The method according to  claim 1  wherein a contact angle of a roller engaged downward with the metal strip during the pivoting in of the strip-tension measurer is used for the direct or indirect measuring of the support force. 
   
   
       4 . The method according to  claim 3  wherein the contact angle is held approximately constant for controlling extent of engagement of the roller. 
   
   
       5 . The method according to  claim 3  wherein the roller is previously rotated up to the speed of the metal strip before pivoting in. 
   
   
       6 . An apparatus for winding metal strips on a mandrel arranged in a coiler to which the metal strip is supplied by a feeder comprising a lower and an upper feed roller, in which a guide plate is provided under the metal strip for guidance and a pivotal strip guide and a pivotal upper guide plate extend downstream from this guide almost up to the mandrel above the metal strip wherein the strip guide is designed as a strip-tension measurer that can be pivoted from above down into engagement with the metal strip and that is provided with a guide body that has a pivotal roller arm that carries a roller on its outer end, and that a force sensor is arranged between the guide body and the roller arm and sends an output to a controller of the feeder. 
   
   
       7 . The apparatus according to  claim 6  wherein the guide body connects a back pivot arm to a front pivot arm of the strip-tension measurer. 
   
   
       8 . The apparatus according to  claim 7 , further comprising
 at least one controlled-stroke pivot cylinder engaging the back pivot arm.   
   
   
       9 . The apparatus according to  claim 6  wherein the roller supported in the roller arm can be driven. 
   
   
       10 . The apparatus according to  claim 6  wherein a driven guide roller is arranged at the axis of rotation of the strip-tension measurer, which axis is at a spacing from the roller arm. 
   
   
       11 . The apparatus according to  claim 6  wherein at least a front part of the guide plate downstream of the lower feed roller and under the metal strip is a pivotal flap. 
   
   
       12 . The apparatus according to  claim 6  wherein the strip-tension measurer is integrated into the upper guide plate with the roller arm and extending toward the mandrel.