Method and Device for Exchange of a Belt

Abstract

The invention relates to a method and a device for the exchange of an old working belt ( 1 ) on a machine for production of a web, for example a paper web, for a new working belt ( 13 ). According to the invention, the exchange is simplified, whereby the track start of the new belt is connected to the old belt, the old belt is made to circulate and thus draws the new belt around such that the new belt adopts the position of the old belt. A joint is then made between two facing ends of the new belt. Said drawing device is embodied such as to permit the old belt for exchange to be pushed from one side of the machine. The device comprises a frame ( 12 ) with two transverse elements ( 12.2, 12.3 ), which enclose the old belt between them in the assembled state. One transverse element ( 12.2 ) supports a roll ( 13.1 ) of the new belt and the other transverse element ( 12.3 ) supports a winding device ( 18 ) for winding on the old belt.

1 . Method for exchanging an old felt belt or mesh belt or other working belt with a new belt provided in roll form ( 13 . 1 ) on a machine for producing a paper web or a paperboard web or some other web made from another flat material; characterized by the following features: 
   1 . 1  the beginning of the new belt ( 13 ) is fixed to the old belt ( 1 );      1 . 2  the position of the old belt ( 1 ) is secured in front of the fixing point looking in the mounting direction;      1 . 3  the old belt ( 1 ) is coupled directly or indirectly to a drive unit; the secured positioning of the old belt ( 1 ) is canceled;      1 . 5  the drive unit is activated, whereby the old belt ( 1 ) takes the new belt ( 13 ) with it until the new belt ( 13 ) has adopted the former position of the old belt ( 1 );      1 . 6  the positions of the beginning and/or the end of the new belt ( 13 ) are secured prior to connecting;      1 . 7  an endless belt loop is formed from the new belt ( 13 ) by making a seam;      1 . 8  the fixing of the new belt ( 13 ) to the old belt ( 1 ) is canceled.    
   
   
       2 . Method for exchanging an old felt belt or mesh belt or other working belt with a new belt on a machine for producing a paper web or a paperboard web or a web made from another flat material; 
 characterized by the following features:      2 . 1  the new belt ( 13 ) is provided in roll form ( 13 . 1 );      2 . 2  the beginning of at least one belt-pull is fixed to the old belt ( 1 ); the position of the old belt ( 1 ) is secured in front of the fixing point looking in the mounting direction;    the belt-pull or belt-pulls are fixed to the old belt ( 1 );      2 . 5  the secured positioning of the old belt ( 1 ) is canceled;      2 . 6  the drive unit is activated, whereby the old belt ( 1 ) takes the belt-pull or belt-pulls with it until the required region is free of the old and/or new belt ( 1 ) or ( 13 );      2 . 7  the end of the belt-pull or belt-pulls is firmly connected to the beginning of the new belt ( 13 );      2 . 8  the drive unit is activated or remains activated, whereby the belt-pull or belt-pulls take the new belt ( 13 ) with them until the new belt ( 13 ) has adopted the former position of the old belt ( 1 );      2 . 9  the positions of the beginning and/or the end of the new belt ( 13 ) are secured prior to connecting;      2 . 10  an endless belt loop is formed from the new belt ( 13 ) by making a seam;      2 . 11  the fixing of the belt-pull or belt-pulls to the new belt ( 13 ) is canceled;    
   
   
       3 . Method according to  claim 1 , characterized in that the old belt ( 1 ) is wound up into a belt roll ( 1 . 1 ).  
   
   
       4 . Method according to  claim 2 , characterized in that the belt-pull is wound up separately from or together with the old belt ( 1 ).  
   
   
       5 . Method according to  claim 1 , characterized in that a pulling force can be applied respectively to the old belt ( 1 ) and/or to the new belt ( 13 ) and/or to the belt-pull or belt-pulls for the purpose of exchanging the belt.  
   
   
       6 . Method according to  claim 2 , characterized by the following features: 
   6 . 1  a pulling force is applied to the belt-pull or belt-pulls;      6 . 2  the free end of the old belt ( 1 ), which is not connected to the belt-pull or belt-pulls, is lowered by its own dead weight and/or by an additional action of force such that the belt-pull or belt-pulls on the other end of the belt ( 1 ) are inserted into the machine again.    
   
   
       7 . Method according to  claim 1 , characterized in that the machine is cleaned after winding up the old belt ( 1 ) and, where applicable, the belt-pull into a belt roll ( 1 . 1 ).  
   
   
       8 . Method according to  claim 1 , characterized in that the belt tension of the belts is established or controlled during the winding up.  
   
   
       9 . Method according to  claim 1 , characterized in that in order to make a seam the two ends of the new belt ( 13 ) are brought together and fitted with a zip fastener and that the seam is then made and the zip fastener removed again.  
   
   
       10 . Device for exchanging an old felt belt or mesh belt or other working belt with a new belt on a machine for producing a paper web or a paperboard web or a web made from another flat material, characterized by the following components: 
   10 . 1  there is provided a frame ( 12 ) comprising at least one first transverse element ( 12 . 2 ) located between two longitudinal elements ( 12 . 2 . 1 ,  12 . 2 . 2 );      10 . 2  the transverse element ( 12 . 2 ) carries a bearing for receiving a roll ( 13 .  1 ) of the new belt in a position in which the axis of the roll ( 13 . 1 ) extends transverse to the running direction of the old belt ( 1 );      10 . 3  there is provided an apparatus for making a seam between two adjacent ends of the new belt ( 13 );      10 . 4  there is provided at least one drive device for the old belt ( 1 ) and/or for the new belt ( 13 ) and/or for a belt-pull or belt-pulls.    
   
   
       11 . Device according to  claim 10 , characterized in that there is provided a brake ( 14 ) for establishing or controlling the belt tension during mounting.  
   
   
       12 . Device according to  claim 10 , characterized in that there is provided on one of the transverse elements ( 12 . 2 ,  12 . 3 ) a winding core ( 18 ) for winding up the old belt ( 1 ).  
   
   
       13 . Device according to  claim 12 , characterized in that the winding core comprises a spiked roller.  
   
   
       14 . Device according to  claim 10 , characterized in that one of the transverse elements ( 12 . 2 , 12 . 3 ) is constructed as a seam platform.  
   
   
       15 . Device according to  claim 10 , characterized in that the length of the belt-pull is greater than or equal to the length of the old belt ( 1 ).  
   
   
       16 . Device according to  claim 10 , characterized in that the two transverse elements ( 12 . 2 ,  12 . 3 ) and the segment ( 12 . 1 ) joining them together has a C-shaped form looking in the web running direction.  
   
   
       17 . Device according to  claim 16 , characterized in that the two transverse elements ( 12 . 2 ,  12 . 3 ) and the segment ( 12 . 1 ) can be turned into a closed frame by an additional segment.  
   
   
       18 . Device according to  claim 1 , characterized in that the device is permanently installed.  
   
   
       19 . Device according to  claim 1 , characterized in that the device is mobile.  
   
   
       20 . Device according to  claim 10 , characterized in that at least one bearing is provided to receive a roll ( 13 . 1 ) of the new belt ( 13 ).