US 5,850,785 AGranted

Coupling construction between an extended-nip roll and a backup roll

AssigneeValmet Corporation

InventorOiva Vallius

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Abstract

A coupling construction between an extended-nip roll including a non-revolving central axle supported by bearings which permit angular deflection of the non-revolving axle and a backup roll. Loading members are mounted on the non-revolving axle for pressing a loading shoe toward the backup roll. The extended-nip roll includes a flexible glide-belt mantle whereby a paper web or board web passes through the nip between the glide-belt mantle and the backup roll. The belt mantle revolves on support of separate bearings. The extended-nip roll and backup roll are interconnected from the bearing housings at the ends of the rolls by tie bolts which include a nut at one end which is threaded onto the threading at the end of the tie bolt. The tie bolt is associated with pre-tightening equipment at the other end of the tie bolt and is passed through bolt holes provided in the bearing housings to be coupled together. The other end of the tie bolt has the threading with which the pre-tightening equipment is coupled.

Claims20

Dependent claims

In a coupling construction for connecting an extended-nip roll and a backup roll, the extended-nip roll including a non-revolving central axle supported at each end by a first bearing housing, at least one loading shoe, loading means mounted on the non-revolving axle for pressing the at least one loading shoe toward the backup roll, and a flexible glide-belt mantle revolving about the at least one loading shoe, the backup roll being supported at each end by a second bearing housing, said first bearing housings supporting the extended-nip roll being connected by connecting means to respective ones of said second bearing housings supporting the backup roll, the improvement comprising

each of said first bearing housings having a plurality of bolt holes,
each of said second bearing housings having a plurality of bolt holes, each of said bolt holes in said second bearing housings aligning with a respective one of said bolt holes in said first bearing housings, and
said connecting means comprising a plurality of elongate tie bolts, each of said tie bolts having first and second threaded ends and extending through one of said bolt holes in said first bearing housings and the respective aligned one of said bolt holes in said second bearing housings, a nut threaded onto said first threaded end of each of said tie bolts for fixing said first threaded end of said tie bolt relative to said first and second bearing housings, and pre-tightening means arranged in connection with said second threaded end of each of said tie bolts for stretching said tie bolt.

Dependencies are inferred from the claim text.