Roller with brush roll between mandrel and sleeve

Abstract

A heat resistant roll is useful for supporting and conveying articles for transport at high temperature. The roll has a mandrel core and a sleeve. The sleeve is enlarged over the core to define a radial clearance therebetween. The mandrel and the sleeve have differing coefficients of thermal expansion. Interposed between the mandrel and the sleeve is a brush roll. The brush roll maintains engagement with both the mandrel and the sleeve during thermal expansion.

1 . A high temperature roll for supporting and conveying material for transport, said roll comprising: 
 a mandrel;    a sleeve fitted thereover to define a radial clearance therebetween and;    a brush roll interposed between said mandrel and sleeve within said radial clearance and engaging both said mandrel and sleeve.    
     
     
         2 . The roll of  claim 1 , wherein said roll has an axial length larger than its diameter, said mandrel has a first coefficient of thermal expansion and said sleeve has a second coefficient of thermal expansion.  
     
     
         3 . The roll of  claim 1 , wherein said mandrel is a solid and elongated cylindrical mandrel and said radial clearance is between an outer peripheral surface of said mandrel and an inner peripheral surface of said sleeve.  
     
     
         4 . The roll of  claim 2 , wherein said mandrel of a first coefficient of thermal expansion is a metal mandrel and said metal is one or more of steel including stainless steel and mild steel, and metal alloy including nickel-chrome alloy.  
     
     
         5 . The roll of  claim 1 , wherein said sleeve is a tubular and elongated open-ended sleeve of cylindrical shape and said sleeve fits on said mandrel to define a radial clearance therebetween when said mandrel is at maximum thermal expansion in radial direction.  
     
     
         6 . The roll of  claim 2 , wherein said sleeve has a smaller coefficient of thermal expansion than said mandrel and said sleeve is mounted on said brush roll by means of an interference fit.  
     
     
         7 . The roll of  claim 6 , wherein said interference fit is between an inner peripheral surface of said sleeve and the outside diameter of said brush roll, with the sleeve and the brush roll retaining secure frictional engagement at elevated operational temperatures of said roll.  
     
     
         8 . The roll of  claim 7 , wherein said secure frictional engagement at said elevated operational temperatures is contributed by said interference fit as well as by a smaller coefficient of thermal expansion for said sleeve as for said brush roll.  
     
     
         9 . The roll of  claim 1 , wherein said sleeve has an axial length longer than its diameter and extends axially at least substantially along the axial length of said mandrel.  
     
     
         10 . The roll of  claim 7 , wherein said roll is a heat resistant roll, said roll contains insulation means, said elevated operational temperatures exceed about 1500° F., and said roll is adapted for conveying articles in sheet form.  
     
     
         11 . The roll of  claim 1 , wherein said sleeve is an incompressible heat insulating outer roll member having a seamless surface at its outer periphery, and said seamless surface is the outer working surface of said roll.  
     
     
         12 . The roll of  claim 1 , wherein said sleeve is a ceramic sleeve of one or more of fused silica, ceramic composite, graphitic composite and sintered material of silicon carbide, silicon nitride, alumina and zirconia.  
     
     
         13 . The roll of  claim 1 , wherein said sleeve is in sections, each section has a short axial length and said sections form a continuous or discontinuous sleeve along the axial length of said mandrel.  
     
     
         14 . The roll of  claim 1 , wherein said brush roll comprises a tubular portion having a peripheral surface and a multitude of radial projections extending from said peripheral surface.  
     
     
         15 . The roll of  claim 14 , wherein said brush roll tubular portion has an inner peripheral surface in secure engagement with an outer peripheral surface of said mandrel and said brush roll and mandrel maintain said secure engagement at elevated operational temperatures of said roll.  
     
     
         16 . The roll of  claim 15 , wherein said brush roll tubular portion has a smaller coefficient of thermal expansion than said mandrel.  
     
     
         17 . The roll of  claim 14 , wherein said tubular portion is an elongated, open-ended tube of cylindrical shape, has an axial length longer than its diameter and extends axially at least substantially along the axial length of said mandrel.  
     
     
         18 . The roll of  claim 14 , wherein said tubular portion is a metal tube, the radially extending projections are metal wires each having a substantially longer length than its diameter, with the wires extending from an outer peripheral surface of said tube, the metal of said tube and said wires is the same, or different, and the metal is one or more of steel including stainless steel and mild steel, and a heat resistant metal alloy.  
     
     
         19 . The roll of  claim 14 , wherein said brush roll tubular portion has an outer peripheral surface in secure engagement with an inner peripheral surface of said sleeve and said radial projections extend radially inwardly from said tubular portion.  
     
     
         20 . The roll of  claim 1 , wherein said brush roll is in sections, each section has a short axial length and said sections form a continuous or discontinuous brush roll along the axial length of said mandrel.  
     
     
         21 . The roll of  claim 20 , wherein said sections are discontinuous along the axial length of said mandrel and insulation disks are interposed between adjacent, spaced-apart sections.  
     
     
         22 . The combination comprising: 
 (a) a heating means capable of attaining elevated operational temperatures; and    (b) means for conveying material for transport at said elevated operational temperatures, said means for conveying comprising a plurality of rolls, and at least one roll comprising: 
 (1) a mandrel;  
 (2) a sleeve fitted thereover to define a radial clearance therebetween; and  
 (3) a brush roll interposed between said mandrel and sleeve within said radial clearance and engaging both said mandrel and sleeve.  
   
     
     
         23 . The combination of  claim 22  wherein said heating means is selected from the group consisting of glass conveying or pulling means, rolling mill means, metal conveying means and preheating means.  
     
     
         24 . The method of securing a sleeve to a mandrel for preparing a high temperature roll for supporting and conveying material for transport, wherein said mandrel has a first coefficient of thermal expansion and said sleeve has a second coefficient of thermal expansion, which method comprises: 
 providing a mandrel having an outer peripheral surface;    providing a sleeve having an inner peripheral surface defining a radial clearance from said outer peripheral surface of said mandrel;    establishing a brush roll of a tubular portion having a peripheral surface containing a multitude of radially extending projections; and    interposing said brush roll into said radial clearance, said brush roll engaging the outer peripheral surface of said mandrel as well as the inner peripheral surface of said sleeve.    
     
     
         25 . The method of  claim 24 , wherein said tubular portion of said brush roll is a tubular and elongated, open-ended tube of cylindrical shape with an inner peripheral surface, an outer peripheral surface having said projections extending outwardly therefrom, and said brush roll is slidingly engaged with said mandrel such that the inner peripheral surface of said tube engages the outer peripheral surface of said mandrel.  
     
     
         26 . The method of  claim 25 , wherein said sliding engagement provides secure frictional engagement between said mandrel and said brush roll and said brush roll occupies said radial clearance between said sleeve and said mandrel.  
     
     
         27 . The method of  claim 24 , wherein said tubular portion has an inner peripheral surface having said projections extending inwardly therefrom.  
     
     
         28 . The method of  claim 24 , wherein said sleeve is heated to provide radial thermal expansion of said sleeve, and said heated sleeve is then slid over said brush roll.  
     
     
         29 . An assembly adapted for engaging a mandrel to provide a high temperature roll for supporting and conveying material for transport, which assembly comprises: 
 a brush roll comprising; 
 a tubular portion having a peripheral surface, together with  
 a multitude of projections extending radially from said peripheral surface; and  
   a sleeve fitted over said brush roll in interference fit therewith.    
     
     
         30 . The assembly of  claim 29 , wherein said sleeve is a tubular and elongated open-ended sleeve of cylindrical shape and said interference fit is between an inner peripheral surface of said sleeve and the outside diameter of said brush roll, with the sleeve and the brush roll retaining secure frictional engagement at elevated operational temperatures of said roll.  
     
     
         31 . The roll of  claim 30 , wherein said secure frictional engagement at said elevated operational temperatures is contributed by said interference fit as well as by a smaller coefficient of thermal expansion for said sleeve as for said brush roll.  
     
     
         32 . The assembly of  claim 29 , wherein said sleeve is an incompressible heat insulating outer assembly member having a seamless surface at its outer periphery, and said seamless surface is the outer working surface of said roll.  
     
     
         33 . The assembly of  claim 29 , wherein said sleeve is a ceramic sleeve of one or more of fused silica, ceramic composite, graphitic composite and sintered material of silicon carbide, silicon nitride, alumina and zirconia.  
     
     
         34 . The assembly of  claim 29 , wherein said tubular portion is an elongated, open-ended tube of cylindrical shape and has an axial length longer than its diameter.  
     
     
         35 . The assembly of  claim 29 , wherein said tubular portion is a metal tube, the radially extending projections are metal wires extending from an outer peripheral surface of said tube, the metal of said tube and said wires is the same or different, and the metal is one or more of steel including stainless steel and mild steel, and a heat resistant metal alloy.  
     
     
         36 . The assembly of  claim 29 , wherein said tubular portion has an outer peripheral surface in secure engagement with an inner peripheral surface of said sleeve and said projections extend radially inwardly from said tubular portion.