US3779735A - Heat sink for tubular conveyor rolls - Google Patents

Heat sink for tubular conveyor rolls Download PDF

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Publication number
US3779735A
US3779735A US00163585A US3779735DA US3779735A US 3779735 A US3779735 A US 3779735A US 00163585 A US00163585 A US 00163585A US 3779735D A US3779735D A US 3779735DA US 3779735 A US3779735 A US 3779735A
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US
United States
Prior art keywords
roll
ribbon
rolls
temperature
wall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00163585A
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English (en)
Inventor
R King
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pilkington North America Inc
Original Assignee
Libbey Owens Ford Co
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Filing date
Publication date
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Assigned to LOF GLASS, INC. reassignment LOF GLASS, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: LIBBEY-OWENS-FORD COMPANY AN OH. CORP.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/02—Skids or tracks for heavy objects
    • F27D3/026—Skids or tracks for heavy objects transport or conveyor rolls for furnaces; roller rails
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B39/008—Rollers for roller conveyors
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B35/00—Transporting of glass products during their manufacture, e.g. hot glass lenses, prisms
    • C03B35/14—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands
    • C03B35/16—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands by roller conveyors
    • C03B35/18—Construction of the conveyor rollers ; Materials, coatings or coverings thereof
    • C03B35/183—Construction of the conveyor rollers ; Materials, coatings or coverings thereof specially adapted for thermal adjustment of the rollers, e.g. insulating, heating, cooling thereof
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B35/00—Transporting of glass products during their manufacture, e.g. hot glass lenses, prisms
    • C03B35/14—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands
    • C03B35/16—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands by roller conveyors
    • C03B35/18—Construction of the conveyor rollers ; Materials, coatings or coverings thereof
    • C03B35/183—Construction of the conveyor rollers ; Materials, coatings or coverings thereof specially adapted for thermal adjustment of the rollers, e.g. insulating, heating, cooling thereof
    • C03B35/184—Cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path
    • F27B9/24—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path being carried by a conveyor
    • F27B9/2407—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path being carried by a conveyor the conveyor being constituted by rollers (roller hearth furnace)

Definitions

  • ABSTRACT Reducing warping of tubular rolls employed in conveying sheet material at elevated temperatures.
  • a liquid or gaseous medium is maintained within the interior of the rolls to act as a heat sink for equalizing the wall temperature circumferentially around and longitudinally along the rolls, thereby minimizing warping due to differentials in temperature 7 Claims, 3 Drawing Figures HEAT SINK FOR TUBULAR CONVEYOR ROLLS BACKGROUND OF THE INVENTION 1.
  • the present invention relates broadly to the conveying of sheet material, and more particularly to rolls used in the conveying of the continuous sheet or ribbon of glass from a facility where it is produced, through an annealing lehr, to a capping area where it is separated into individual blanks for subsequent processing.
  • heat is supplied as by gas-fired burners whereby the temperature of the ribbon is allowed to gradually decrease according to a predetermined pattern as it moves through the lehr, until it reaches a level at which it can safely exit from the enclosed portion and continue along the horizontal path for cooling to room temperature in the ambient atmosphere.
  • the ribbon may be at a temperature on the order of 1,100 to 1,200 F., and for carrying the ribbon in this region chrome plated steel or stainless steel rolls are preferred.
  • chrome plated steel or stainless steel rolls are preferred at subsequent stages of the annealing process, where the ribbon has cooled somewhat.
  • metallic rolls covered with a heat resistant material such as asbestos have conventionally been employed.
  • rolls of chrome plated steel are preferred over asbestos covered rolls in this area because of their durability and superior surface quality.
  • Such chrome plated rolls sometimes have a tendency to bow or warp during use due to creation of unequal temperatures around their periphery. If the warping becomes pronounced, it tends to become self-perpetuating.
  • the portion bowed convexly will contact the heated ribbon while the opposite or concavely bowed portion will not do so because of the supporting rolls at either side.
  • Heat will be conducted to the portion which periodically engages the relatively hot ribbon, while the opposite portion will not be heated to a similar extent.
  • the temperature differential around the roll periphery, and hence the warping is increased. This, in turn, tends to increase the temperature differential until a stable condition of unequal temperatures is reached.
  • a liquid or gaseous medium is introduced into the interior of the lehr rolls.
  • the medium acts as a heat sink within the rolls to prevent formation of and even out existing temperature differentials around the wall as the rolls r0- tate. Existing warpage due to uneven peripheral temperatures is thus substantially reduced and, since the temperature tends to equalize circumferentially around and longitudinally along the rolls, they do not warp through extended use.
  • FIG. 1 is a longitudinal side view, partially in vertical section, of an annealing and conveying apparatus embodying the invention
  • FIG. 2 is a plan view, partially in section, of the apparatus and
  • FIG. 3 is a longitudinal sectional view through a typical roll of the invention and taken substantially along line 3-3 of FIG. 1.
  • FIG. 1 a typical annealing lehr for a continuous ribbon of glass.
  • an annealing lehr comprised of an enclosed section 11 and an open section 12.
  • a continuous glass ribbon 13 produced by suitable apparatus such as shown in the aforementioned U. S. Pat. No. 3,469,964, is carried through the enclosed portion and along the open section of the lehr on a series of aligned rolls 14 which are suitably driven in a conventional manner (not shown).
  • the ambient atmosphere circulates beneath the rolls in the open section of the lehr so that they are subjected to a substantial temperature differential. In the enclosed portion, the temperature is substantially uniform around any given roll.
  • the problem with which the present invention is concerned occurs primarily in the open section of the lehr, and only the exit end of the enclosed section 11 has been illustrated for purposes of describing the invention. It will be understood, however, that the principles of the invention are applicable to rolls at any location in the annealing process where warping occurs due to temperature differentials around or along the rolls, and that while the invention is described with reference to an annealing lehr for flat glass, it is generally applicable to conveying of any type of sheet material or any products at elevated temperatures.
  • the enclosed portion 11 of the lehr includes a roof l5, floor l6, opposite side walls 17, and an exit end wall 18.
  • the ribbon 13 emerges from the enclosed section 11 of the lehr through an opening 19 in the end wall 18.
  • Suitable heaters (not shown) are provided within the enclosed section to maintain the necessary temperature pattern so that the ribbon will be gradually cooled down to the appropriate level at the exit point.
  • the ribbon is generally at a temperature on the order of 350 F. to 400 F. at this point, and is then allowed to gradually cool down to atmospheric temperature as it traverses the open section 12.
  • a partition 20 is provided over the open section of the lehr within the lehr building to reduce convection currents moving therealong due to the temperature differential between the opposite ends of the open section.
  • An electronic optical thickness gauge such as disclosed closed in U. S. Pat. No. 3,591,293 issued July 6, 1971 to Robert E. Maltby et al., illustrated generally at 21, may be positioned over the ribbon to continually monitor its thickness.
  • the operation of such optical instruments is dependent upon the ribbon remaining a fixed distance from the scanning mechanism. Warping of the rolls l4 therebeneath, whereby the ribbon is caused to fluctuate vertically, is thus particularly troublesome in that it causes erroneous and unreliable thickness readings.
  • warping in the rolls 14 is substantially eliminated, or at least reduced to the point of insignificance, by introducing a liquid or gaseous medium to the interior of the rolls to act as a heat sink for equalizing the temperature around and along the roll.
  • the hollow cylindrical roll 14 is closed at the ends as by plates 22 forming a closed chamber 23 therein.
  • a filler plug 24 may be threaded into an opening 25 in one of the end plates so as to provide access for admitting the heat sink medium to the chamber 23.
  • Shafts 26 may be provided at the ends for joumaling and driving the rolls in a suitable manner, or they may be mounted for driven rotational movement in any other suitable manner conventional in the art.
  • the shafts 26 may be hollow and the heat sink medium may also be admitted through one of the shafts to the chamber 23.
  • the bodies of such rolls in a conventional annealing lehr are on the order of 14 feet in length and have an inside diameter of about I 1 inches, so that they have an internal volume of about 9.24 cubic feet or 69.16 gallons.
  • any liquid which is stable at the temperatures encountered and which does not adversely affect the rolls as by corrosive attack thereon, may be employed in practicing the invention.
  • Ordinary water has been found to perform very well in the rolls at the cooler end of the lehr where the temperature does not exceed its boiling point.
  • open-ended rolls having a surface temperature considerably above the boiling point of water, on the order of 450 F. to 500 F.
  • very dramatic reductions in roll warp have been achieved by dripping water onto the interior surface from a pipe (not shown) inserted through the end thereof.
  • the water droplets are immediately converted to steam and the steam serves to equalize the temperature around the roll.
  • a roll operating at a surface temperature of 480 F. had a warp or run-out of 0. 102 inch.
  • warp was decreased to 0.005 inch, the amount of deviation measured with the roll at atmospheric temperature prior to the trial.
  • Warping may occur to varying degrees throughout the open section 12 of the lehr due to the combined effect of the temperature of the glass ribbon and the temperature of the ambient atmosphere surrounding the rolls. However, it has been found that the tendency to warp to an appreciable extent is greatest in the first 12 or 15 rolls following the closed section 11, with the most severe warping occurring in the vicinity of and immediately after the partition 20.
  • the amount by which the warping or run-out is reduced by the invention is generally proportional to the volume of heat transfer medium within the roll acting as a heat sink, up to the point where run-out attributable to temperature differential is substantially eliminated.
  • the second roll preceding the partition 20 had a maximum surface temperature at the glass ribbon of 245 F. and a run-out of 0.303 inch.
  • Five gallons of Dowtherm A were inserted through the opening 25 to form a liquid heat sink 27 (FIG. 3) in the lower portion of the roll chamber 23. After operating conditions stabilized, the run-out was reduced to 0.145 inch.
  • apparatus for conveying a continuous ribbon of material at an elevated temperature along a predetermined path through an atmosphere at a temperature substantially lower than that of said ribbon, including a plurality of spaced tubular rolls upon which said ribbon is supported and means for driving said rolls to advance said ribbon along said path, the improvement comprising a liquid heat exchange medium thermally isolated within and partially filling the hollow interior of at least one of said tubular rolls in a zone where said ribbon is at said elevated temperature for exchanging heat with the wall of said roll to reduce the temperature differential in said wall as said roll rotates.
  • apparatus for conveying a continuous ribbon of material at an elevated temperature along a predetermined path through an atmosphere at a temperature substantially lower than that of said ribbon, including a plurality of spaced tubular rolls upon which said ribbon is supported and means for driving said rolls to advance said ribbon along said path, the improvement comprising a fluid heat exchanging medium within the hollow interior of at least one of said tubular rolls for exchanging heat with the wall of said roll to reduce the temperature differential in said wall as said roll rotates, said one roll being open at one of its ends and including a pipe extending into the interior of said roll from the open end, means supplying a vaporizable liquid to said pipe, and means in said pipe allowing said liquid to drip onto the interior wall of said one roll, said wall being at a temperature above the vaporizing point of said liquid so that all of said liquid vaporizes as it drips onto said wall to fill said hollow interior and form said heat exchange medium.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Rollers For Roller Conveyors For Transfer (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
US00163585A 1971-07-19 1971-07-19 Heat sink for tubular conveyor rolls Expired - Lifetime US3779735A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US16358571A 1971-07-19 1971-07-19

Publications (1)

Publication Number Publication Date
US3779735A true US3779735A (en) 1973-12-18

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US00163585A Expired - Lifetime US3779735A (en) 1971-07-19 1971-07-19 Heat sink for tubular conveyor rolls

Country Status (10)

Country Link
US (1) US3779735A (enrdf_load_stackoverflow)
JP (1) JPS5344932B1 (enrdf_load_stackoverflow)
BE (1) BE786231A (enrdf_load_stackoverflow)
CA (1) CA978936A (enrdf_load_stackoverflow)
DE (1) DE2236023A1 (enrdf_load_stackoverflow)
FR (1) FR2146355B1 (enrdf_load_stackoverflow)
GB (2) GB1400992A (enrdf_load_stackoverflow)
IT (1) IT961407B (enrdf_load_stackoverflow)
LU (1) LU65733A1 (enrdf_load_stackoverflow)
NL (1) NL7209955A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011082334A1 (de) * 2011-09-08 2013-03-14 Von Ardenne Anlagentechnik Gmbh Substratbehandlungsanlage
WO2013166754A1 (zh) * 2012-05-07 2013-11-14 深圳市华星光电技术有限公司 一种滚轮传送装置及其检测滚轮转动同步性的方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63151512U (enrdf_load_stackoverflow) * 1987-03-24 1988-10-05

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1392626A (en) * 1920-01-19 1921-10-04 Cox Walter Water-cooled glass-roller
US1536832A (en) * 1924-05-13 1925-05-05 Pittsburgh Plate Glass Co Fluid-cooled roll
US1754826A (en) * 1928-01-17 1930-04-15 Pittsburgh Plate Glass Co Fluid-cooled roll
US1841716A (en) * 1927-01-27 1932-01-19 Libbey Owens Ford Glass Co Heat absorbing means for sheet glass apparatus
US1844062A (en) * 1930-05-27 1932-02-09 Pittsburgh Plate Glass Co Fluid cooled roll

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1392626A (en) * 1920-01-19 1921-10-04 Cox Walter Water-cooled glass-roller
US1536832A (en) * 1924-05-13 1925-05-05 Pittsburgh Plate Glass Co Fluid-cooled roll
US1841716A (en) * 1927-01-27 1932-01-19 Libbey Owens Ford Glass Co Heat absorbing means for sheet glass apparatus
US1754826A (en) * 1928-01-17 1930-04-15 Pittsburgh Plate Glass Co Fluid-cooled roll
US1844062A (en) * 1930-05-27 1932-02-09 Pittsburgh Plate Glass Co Fluid cooled roll

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011082334A1 (de) * 2011-09-08 2013-03-14 Von Ardenne Anlagentechnik Gmbh Substratbehandlungsanlage
DE102011082334B4 (de) * 2011-09-08 2017-01-26 Von Ardenne Gmbh Substratbehandlungsanlage
WO2013166754A1 (zh) * 2012-05-07 2013-11-14 深圳市华星光电技术有限公司 一种滚轮传送装置及其检测滚轮转动同步性的方法

Also Published As

Publication number Publication date
JPS5344932B1 (enrdf_load_stackoverflow) 1978-12-02
NL7209955A (enrdf_load_stackoverflow) 1973-01-23
FR2146355B1 (enrdf_load_stackoverflow) 1976-08-13
LU65733A1 (enrdf_load_stackoverflow) 1972-10-30
GB1400190A (en) 1975-07-16
IT961407B (it) 1973-12-10
CA978936A (en) 1975-12-02
GB1400992A (en) 1975-07-16
FR2146355A1 (enrdf_load_stackoverflow) 1973-03-02
BE786231A (fr) 1972-11-03
DE2236023A1 (de) 1973-02-01

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AS Assignment

Owner name: LOF GLASS, INC.,OHIO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LIBBEY-OWENS-FORD COMPANY AN OH. CORP.;REEL/FRAME:004687/0980

Effective date: 19860320

Owner name: LOF GLASS, INC., 811 MADISON AVE., TOLEDO, OH 4369

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. SUBJECT TO CONDITION RECITED.;ASSIGNOR:LIBBEY-OWENS-FORD COMPANY AN OH. CORP.;REEL/FRAME:004687/0980

Effective date: 19860320

STCF Information on status: patent grant

Free format text: PATENTED FILE - (OLD CASE ADDED FOR FILE TRACKING PURPOSES)