Insulating device for a variable thermal rim insulation of a roll

Abstract

An insulating device of a roll for thermal and mechanical treatment of a web-shaped product, such as a paper web, provides a variable, thermal rim insulation in a peripheral thermal treatment conduit of the roll. The insulating device is formed in a peripheral thermal treatment conduit of a roll body at at least one end of the roll body and has a shifting insert coupled to a positioner. The insulating device is elongatable in the thermal treatment conduit in the longitudinal direction of the thermal treatment conduit. A roll incorporated the insulating device of the invention also includes a roll body, thermal treatment conduits, and a positioner for the insulating device.

What is claimed is:  
     
         1 . An insulating device of a roll for thermal and mechanical treatment of a web-shaped product, said device being formed in a peripheral thermal treatment conduit of a roll body at one end of the roll body and comprising at least one shifting insert which is coupled to a positioning means in such a way that a setting movement of the positioning means causes a shifting movement of the shifting insert from a rear position deeper into the thermal treatment conduit, to provide a variable, thermal rim insulation,  
       characterized in that 
 the insulating device is elongatable in the thermal treatment conduit in the longitudinal direction of the thermal treatment conduit.  
 
     
     
         2 . The insulating device as set forth in  claim 1 , characterized in that the insulating device comprises an insulating insert, relative to which the shifting insert is shiftable, and which is preferably arranged non-shiftable in the thermal treatment conduit.  
     
     
         3 . The insulating device as set forth in the preceding claim, characterized in that the insulating insert consists of a thermally insulating material, preferably Teflon or a ceramic material, or comprises such a material as an insulating layer.  
     
     
         4 . The insulating device as set forth in  claim 2 , characterized in that the insulating insert forms a thermally insulating longitudinal area of the insulating device by forming an insulating space through which the thermal treatment fluid does not flow or does not flow unhindered.  
     
     
         5 . The insulating device as set forth in the preceding claim, characterized in that the insulating insert is made of stainless steel.  
     
     
         6 . The insulating device as set forth in  claim 1 , characterized in that the insulating device comprises a thermally insulating longitudinal area in which an insulating space is formed through which the thermal treatment fluid does not flow or does not flow unhindered.  
     
     
         7 . The insulating device as set forth in the preceding claim, characterized in that the thermally insulating longitudinal area is formed in a area of the thermal treatment conduit which elongates the thermal treatment conduit beyond an inlet or outlet of a thermal treatment fluid feeder, towards the end of the roll body.  
     
     
         8 . The insulating device as set forth in  claim 1 , characterized in that the shifting insert forms an insulating space through which the thermal treatment fluid does not flow or does not flow unhindered, and in that the length of this insulating space is changed by the shifting movement of the shifting insert.  
     
     
         9 . The insulating device as set forth in  claim 1 , characterized in that the shifting insert comprises a layer made of a thermally insulating material or consists entirely of such a material, preferably Teflon or a ceramic material, or is made of stainless steel.  
     
     
         10 . The insulating device as set forth in  claim 1 , characterized in that a guideway or a follower is formed by a shell surface of the roll body forming the thermal treatment conduit or by an insert arranged in the thermal treatment conduit, the shifting insert engaging with said guideway or follower, to linearly guide the shifting insert.  
     
     
         11 . The insulating device as set forth in  claim 1 , characterized in that the shifting insert forms a joint element of a cam mechanism which converts the setting movement of the positioning means into the shifting movement of the shifting insert.  
     
     
         12 . The insulating device as set forth in the preceding claim, characterized in that the cam mechanism is formed in the thermal treatment conduit.  
     
     
         13 . The insulating device as set forth in  claim 11 , characterized in that the cam mechanism comprises a guideway and a follower which engages and is guided by the guideway, and in that the follower or the guideway is connected to the shifting insert immovably, at least with respect to the shifting movement and the setting movement.  
     
     
         14 . The insulating device as set forth in the preceding claim, characterized in that an insulating insert or positioning insert arranged movably in the thermal treatment conduit for coupling with the positioning means forms the guideway or the follower of the cam mechanism.  
     
     
         15 . The insulating device as set forth in the preceding claim, characterized in that the insulating insert or the positioning insert forms the guideway and the shifting insert forms the follower, and in that the follower, penetrating the guideway, engages another guideway which forms a linear guide for the shifting insert.  
     
     
         16 . The insulating device as set forth in  claim 11 , characterized in that a follower connected to the shifting insert to form the cam mechanism engages a guideway formed on a shell surface of the roll body, said shell surface forming the thermal treatment conduit.  
     
     
         17 . The insulating device as set forth in  claim 11 , characterized in that the insulating device comprises an insulating insert and a positioning insert which are at least partially arranged in the thermal treatment conduit, wherein the insulating insert forms a thermally insulating longitudinal area of the insulating device and the positioning insert is coupled to the positioning means and forms a guideway or a follower of the cam mechanism.  
     
     
         18 . The insulating device as set forth in the preceding claim, characterized in that the insulating insert forms a response member of the cam mechanism.  
     
     
         19 . The insulating device as set forth in  claim 1 , characterized in that a coupling member which revolves or is rotatably mounted about a rotational axis of the roll body engages with a drive wheel of the insulating device and a driven wheel of the positioning means with a positive lock, for a non-slip transmission of the setting movement of the positioning means into the shifting movement of the shifting insert.  
     
     
         20 . The insulating device as set forth in  claim 1 , characterized in that a coupling member is mounted shiftable and fixable in the longitudinal direction of the thermal treatment conduit in a trunnion flange arranged on the roll body, the coupling member being connected non-shiftably to the shifting insert.  
     
     
         21 . The insulating device as set forth in the preceding claim, characterized in that the positioning means comprises a positioning spindle which is non-shiftably rotatably mounted in the receiving bore of the trunnion flange and forms a spindle drive with the coupling member for shifting the shifting insert.  
     
     
         22 . The insulating device as set forth in  claim 1 , characterized in that the insulating device is formed by bellows.  
     
     
         23 . A roll for thermal and mechanical treatment of a web-shaped product, said roll comprising: 
 a) a roll body;    b) thermal treatment conduits for a thermal treatment fluid, said conduits running in the roll body near to the surface of the roll body;    c) insulating devices formed in the thermal treatment conduits at one end of the roll body and comprising shifting inserts which may be moved deeper into the thermal treatment conduits from rear positions, to provide a variable, thermal rim insulation; and    d) a positioning means for the insulating devices;    characterized in that    e) the insulating devices are elongatable in the thermal treatment conduits in the longitudinal direction of the thermal treatment conduits.    
     
     
         24 . The roll as set forth in the preceding claim, characterized in that the insulating are each formed by an insulating device as set forth in any one of  claims 1  to  22 .