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SPECIFICATIONS:
PURPOSE: COIL TO COIL HORIZONTAL FURNACE TO BRIGHT ANNEAL STAINLESS STEEL
STRIP IN A CONTROLLED HYDROGEN/NITROGEN ATMOSPHERE USING A WEB LOOP TENSION
CONTROL SYSTEM TO PREVENT STRETCHING AND SHAPE DEFORMITY.
MAXIMUM WIDTH OF STRIP: 16" (406MM)
THICKNESS OF STRIP: 0.005" - 0.060" (0.127MM - 1.5MM)
MAXIMUM OPERATING TEMPERATURE: 2250 DEG. F (1230 DEG. C)
MAXIMUM COIL WEIGHT: 4,000 LBS. (1815 KG)
LINE SPEED: 0-80 FPM (0-24M/MIN.)
PROGRAM SPECIFICATIONS:
ONE (1) SPECIAL CONTROLLED ATMOSPHERE, HORIZONTAL, ELECTRICALLY HEATED
CONTINUOUS STRIP ANNEALING FURNACE LINE. MAXIMUM FURNACE OPERATING TEMPERATURE
2250 DEG. F (1230 DEG. C). MATERIAL TO BE ANNEALED: STAINLESS STEEL STRIP
VARYING IN THICKNESS FROM 0.005" (0.127MM) TO 0.060" (1.5MM) AND MAXIMUM WIDTH
OF 16" (406MM). CYCLE: HEAT TO 2200 DEG. F (1200 DEG. C), COOL TO
APPROXIMATELY 150 DEG. F (65 DEG. C) IN THE FAST COOL SECTION.
CAPACITY: THE EQUIPMENT WILL HAVE SUFFICIENT HEATING AND COOLING AVAILABLE TO
CONTINUOUSLY PROCESS 900 LBS. (400 KG/HR.). PER HOUR OF 14" (355MM) STRIP
UNDER CYCLE SPECIFIED ABOVE. THE ABOVE REFERS ONLY TO THE AMOUNT OF HEATING
AND COOLING AVAILABLE. THE ACTUAL CAPACITY WILL DEPEND ON THE NATURE OF THE
MATERIAL BEING HEATED, ITS ABILITY TO ABSORB AND RELEASE HEAT, THE WIDTH AND
GAUGE OF THE STRIP BEING ANNEALED AND THE ACTUAL HEATING AND COOLING CYCLE
BEING EMPLOYED.
CONDITION OF THE MATERIAL: THE EQUIPMENT DESCRIBED HEREIN WILL PROVIDE FOR
CLEAN OR BRIGHT ANNEALING OF THE STAINLESS STEEL STRIP, PROVIDING THAT THE
MATERIAL BEING ANNEALED IS CLEAN AND NON-OXIDIZED. SOME TYPE OF STAINLESS
STEEL MAY LOOSE A CERTAIN AMOUNT OF LUSTER IN THE ANNEALING OF THE STAINLESS
STEEL STRIP, BUT THE MATERIAL WILL BE DELIVERED FROM THE EQUIPMENT IN NON-
OXIDIZED CONDITION, DEPENDING ON THE QUALITY AND QUANTITY OF THE PROTECTIVE
GAS ATMOSPHERE.
CONTROLS: NEMA 12 FLOOR MOUNTED ELECTRICAL ENCLOSURE WITH PLC CONTROLLER WITH
DIGITAL INTERFACE, AC/DC DRIVES, PANEL MATE TOUCH SCREEN OPERATOR INTER PHASE,
PC BASED DATA LOGGING SYSTEM, WITH COMPLETE SOFTWARE FOR SEQUENCING AND
CONTROL OF ALL SYSTEM LOGIC.
GENERAL ARRANGEMENT: THIS SECTION DESCRIBES GENERAL DIMENSIONS OF THE FURNACE
SYSTEM. PLEASE NOTE THAT THE ACTUAL LENGTH WILL DEPEND ON THE OPTIONS SELECTED
AND SPECIFIED BY THE PURCHASER.
1. DRIVEN UNCOILER WITH AC MOTOR, GEAR BOX AND ENCODER
INSIDE DIAMETER OF COIL: 16" (406MM)
MAXIMUM WEIGHT OF THE COIL: 4,000 LBS. (1815 KG)
MAXIMUM COIL WIDTH: 16" (406MM)
MANDREL SHAFT FACE WIDTH: 20" (508MM)
EXPANSION RANGE: 15" TO 16" (381MM - 406MM)
EXPANSION/COLLAPSE: HYDRAULIC
DRIVE: DRIVEN BY AC MOTOR
LINE SPEED: 80 FPM MAXIMUM (24M/MIN.)
BACK TENSION: BY 7.5 HP AC MOTOR AND GEAR BOX
DESCRIPTION: THE UNCOILER RECEIVES AND HOLDS THE COIL FOR FEEDING INTO THE
LINE ON UNDER PAY-OFF MODE. THE UNCOILER MANDREL HEAD WILL BE OF FOUR-SEGMENT
WEDGE TYPE ASSEMBLY. THE SEGMENTS ARE ATTACHED TO THE SLIDING SLEEVE THROUGH A
SERIES OF INTERLOCKING MACHINED WEDGE SURFACES. THE SEGMENTS WILL BE
RESTRAINED FROM SLIDING SLEEVE BY A FLANGE ON THE MANDREL THROUGH A WEAR
STRIP. A 4,000 LB. MAXIMUM WEIGHT COIL IS PLACED AND CENTERED ON THE MANDREL.
THE UNCOILER IS EQUIPPED WITH HYDRAULIC EXPANSION FEATURE TO HOLD THE COIL. A
7.5 HP AC MOTOR AND GEAR BOX PROVIDES BACK TENSION. THE MANDREL SHAFT ASSEMBLY
IS MOUNTED ON A FABRICATED AND PRECISION-MACHINED HOUSING ON ANTI-FRICTION
BEARING. THE BEARING END COVERS ARE PROVIDED WITH GREASE NIPPLES FOR
LUBRICATION OF BEARINGS. THE ACTUATION OF THE MANDREL HEAD EXPANSION AND
COLLAPSE WILL BE BY HYDRAULICALLY OPERATED SCREW MECHANISM FROM THE FRONT SIDE
OF THE HEAD ASSEMBLY.
2. BANNER ENGINEERING ULTRA SONIC COIL DIAMETER SENSOR
3. ABSOLUTE 1024 PULSE ENCODER
4. TENSION BRIDLE # 1 (AT ENTRY SIDE):
TYPE OF BRIDLE: S - TYPE
NO. OF ROLLS: TWO
DIAMETER OF THE ROLLS: 16" (406MM)
FACE WIDTH OF ROLLS: 16" (406MM)
LINE SPEED: 80 FPM (24M/MIN.)
ROLL DRIVE: BY 5 HP, 1500 RPM, DC MOTOR WITH GEAR BOX.
DESCRIPTION: THE TENSION BRIDLE WILL HAVE TWO BRIDLE ROLLS MOUNTED ON A COMMON
BASE FRAME. BOTH THE ROLLS ARE DRIVEN BY A 5 HP DC MOTOR THROUGH A HELICAL
REDUCTION GEARBOX. THE POLYURETHANE COVERED ROLLS ARE MOUNTED ON THE BASE
FRAME ON ANTI-FRICTION BEARINGS.
5. DEFLECTOR ROLL: NEXT TO THE TENSION BRIDLE ROLL # 1, A DEFLECTOR ROLL IS
PROVIDED IN FRONT OF THE FURNACE ENTRY CHAMBER. THE DIAMETER OF THE ROLL IS 4"
AND IT IS A TUBULAR CONSTRUCTION MOUNTED ON BEARING BLOCKS ON ANTI-FRICTION
BEARINGS. THE BARREL OF THE DEFLECTOR ROLL IS GROUNDED AND HARD CHROME PLATED.
6. TENSION LOAD CELLS # 1: THIS IS USED TO GIVE THE TENSION FEEDBACK BETWEEN
THE ENTRY BRIDLE AND DEFLECTOR ROLL AT THE END OF FURNACE. IT IS DESIGNED TO
CONTROL THE STRIP TENSION IN THE FURNACE LOOP. A TENSION MEASURING LOAD CELLS
ARE PROVIDED UNDER THE DEFLECTOR ROLL IN FRONT OF THE TENSION BRIDLE # 1 AT
THE DELIVERY SIDE OF THE LINE TO MEASURE AND CONTROL PRECISELY AND PERMANENTLY
TO ALLOW FOR A RELIABLE THE REFERENCE VALUE, THERE ARE IRREGULARITIES IN THE
MATERIAL BEING TREATED IN THE PRODUCTION RUN AS SUCH. THESE IRREGULARITIES
WILL BE CORRECTED IMMEDIATELY BY THIS TENSION MEASURING LOAD CELLS. THIS UNIT
CONSISTS OF THE WEB TENSION MONITOR (LOAD CELLS) MOUNTED ON THE BRACKETS OF A
ROLL. THE WEB TENSION MONITOR DETERMINES THE ACTUAL TENSION VALUES, CONVERTED
INTO LINEAR, OVERLOAD-PROOF ANALOG SIGNALS, ARE PASSED ON TO THE DC MOTOR
CONTROLLER AND AMPLIFIED. THE SIGNALS HAVE A HIGH ZERO POINT CONSTANCY. THE
PLC COMPARES THE REFERENCE VALUE WITH THE ACTUAL VALUE AND THE LOGIC EMITS A
SIGNAL TO THE DC MOTOR CONTROLLER.
7. CHARGE END GAS ATMOSPHERE ENTRY SECTION: A SPECIAL ATMOSPHERE SEAL
ASSEMBLY, INCLUDING GAS TIGHT STEEL HOUSING OF WELDED CONSTRUCTION WILL BE
PROVIDED. THE HOUSING WILL INCORPORATE A SEAL SYSTEM INCORPORATING FELT PADS
WITH ONE ROLL EACH ABOVE AND BELOW THE STRIP ARRANGED FOR EASY ADJUSTMENT OR
REPLACEMENT. IN ADDITION, A FABRICATED NITROGEN CURTAIN SYSTEM WILL BE
INCORPORATED ADJACENT TO THE SEALS TO MINIMIZE AIR INFILTRATION AND MAINTAIN
POSITIVE FURNACE PRESSURE. THERE WILL BE PROVISION FOR A WATER-JACKETED
EXTENSION ADJACENT TO THE CHARGING END OF THE FURNACE-HEATING CHAMBER. THE
EXTENSION WILL HAVE INNER AND OUTER SHELLS OF GAS TIGHT WELDED CONSTRUCTION.
THE INNER AND OUTER SHELL WILL BE FABRICATED FROM 1/2" THICK T 316L ALLOY
PLATES, REINFORCED AND SUPPORTED WHERE NECESSARY AND EQUIPPED WITH STAINLESS
STEEL WATER INLET AND OUTLET FITTINGS FOR CONNECTION TO THE PLANT WATER SUPPLY
AND DRAIN LINES. THE ENTRY CHAMBER AT PASS LINE WILL HAVE HIGH TEMPERATURE
ALLOY ROLL COVERED WITH GRAPHITE TUBE. THE ISOSTATICALLY MOLDED GRAPHITE TUBE
WILL BE OF HLM GRADE, 4.00" +/- .005" O.D. X 3.050" +/- .005" I.D. X 26" LONG
WITH POLISHED SURFACE GRADE 890S. THE ROLL WILL BE DRIVEN BY A 1.5 HP AC MOTOR
AND MATCHING GEAR BOX.
8. FURNACE: A 20 FT. LONG X 4 FT. 10" WIDE X 4 FT. HIGH HOT ZONE MADE OF 1/2"
STEEL PLATE, WITH ELECTRICAL HEATING ELEMENTS KANTHAL K-A1 PROVIDING THE
HEAT(240 KW, 240V, DELTA 2 IN SERIES). THERE IS FURNACE MUFFLE MADE OF HT
ALLOY 600 18" X 16" X 17.5' LONG. THE FURNACE COVERING WILL BE COVERED ON THE
UNDERSIDE WITH FIREBRICKS RATED TO 2600 DEGREES F TO MAINTAIN UNIFORM HEAT
ENCLOSE IN THE HEAT CHAMBER ENCLOSURE. HIGH PURITY ALUMINA FIREBRICKS ON ALL
SIDE CAPABLE OF WITHSTANDING 2,600 DEGREES F WILL LINE THE FURNACE. THE
OPERATING TEMPERATURE WILL BE 2150 DEGREES F, WHICH WILL BE DIGITALLY
CONTROLLED WITH PROCESS/CONTROL THERMOCOUPLES X 3 ZONE CONTROL AND DIGITAL
TEMP. PID CONTROL SYSTEM. THE FURNACE WILL BE DESIGNED TO PREVENT ANY SCRATCH
MARKS ON THE MATERIAL AND THE TENSION CONTROL SYSTEM WILL PREVENT STRETCHING
OF THE MATERIAL IN THE HEAT ZONE.
9. JET COOLING SECTION: THE HOT ZONE IS FOLLOWED BY A 25 FT. LONG COOLING ZONE
MADE OF 1/4" STEEL WITH THREE GRAPHITE TUBING COVERED DRIVEN ROLLS. THE JET
COOL SECTION HAS 0.5 HP AC MOTOR DRIVEN GAS TIGHT BLOWER FAN X 3 WITH
PROVISION FOR WATER COOLING. IT IS DESIGNED TO OPERATE IN EXTREME TEMPERATURE
ENVIRONMENTS. CONTINUOUS WELDED HOUSINGS, SPECIAL BRACING AND CENTERLINE
SUPPORTS ARE USED, TO ALLOW FOR THERMAL EXPANSION AND TO STRENGTHEN BLOWER
RIGIDITY. IT HAS GAS TIGHT CONSTRUCTION AND HAS SHAFT SEALS, COOLING SECTION,
SPECIAL BEARINGS AND OTHER FEATURES TO ALLOW FOR OPERATION AT HIGH
TEMPERATURE. THERE IS ALSO PROVISION FOR HEAT EXCHANGER WITH ALUMINUN FINS.
IT IS WATER COOLED WITH CIRCULATING WATER TO RAPIDLY COOL THE STAINLESS STEEL
STRIP. PROCESS HYDROGEN AND PURGE NITROGEN IS INTRODUCED AT THE BEGINNING OF
THE COOL ZONE VIA STAINLESS TUBING TO PREVENT OXIDATION. TEMPERATURE IS
MONITORES BY K TYPE THERMOCOUPLE. THEY HAVE EXCELLENT LONG TERM OUTPUT
STABILITY AT HIGH TEMPERATURES, TEMP. UP TP 1335 deg. c (2440 deg. f) AND HAVE
LOW THERMAL DRIFT. HAZARDOUS AREA CERTIFIED DEW POINT TRANSMITTER TRANSMET IS
(MITCHELL INSTRUMENT) IS USED TO MONITOR PROCESS DEW POINT. THE INTRINSICALLY
SAFE TRANSMET I.S. CERAMIC DEWPOINT TRANSMITTER MEASURES DEW POINT OVER THE
RANGE -100/+20 deg. c. IT IS DESIGNED FOR USE WITHIN THE FOLLOWING HAZARDOUS
AREAS: CLASS i, DIVISION 1, GROUPS a, b, c & d t4 WHEN USED WITH AN
APPROPIATE SAFETY BARRIER(s). THE TRANSMET I.S. IIS CONNECTED AS A 3-WIRE
TRANSMITTER WITH A CURRENT SINK OUTPUT, WHICH CAN BE SWITCH SELECTED FOR
EITHER 4-20ma or 0-20ma. THIS OUTPUT IS LINEAR OVER THE ENTIRE DEWPOINT
MEASUREMENT RANGE, from -100/+20 deg. c dp. TRANSMET I.S. IS APPROVED AS AN
INTRINSICALLY SAFE DEVICE FOR USE IN HAZARDOUS LOCATIONS
10. DISCHARGE END
11. AUTO EDGE WEB GUIDE SYSTEM
12. TENSION BRIDLE #2
type of bridle: s - type
no. of rolls: two
diameter of the rolls: 16" (406mm)
face width of rolls: 16" (406mm)
line speed: 80 fpm (24m/min.)
roll drive: by 7.5 hp, 1500 rpm, dc motor.
DESCRIPTION: THE TENSION BRIDLE WILL HAVE WO BRIDLE ROLLS MOUNTED ON A COMMON
BASE FRAME. BOTH THE ROLLS ARE DRIVEN BY A 5 hp dc MOTOR THROUGH A HELICAL
REDUCTION GEARBOX AND BULL GEAR. THE ROLLS ARE MOUNTED ON THE BASE DRAME ON
ANTI FRICTION BEARINGS. THE ROLLS ARE COVERED WITH POLYURETHANE LINING.
13. TENSION LOAD CELL #2 WITH DEFLECTOR ROLL: NEXT TO A SET OF DEFLECTOR ROLLS
ARE PROVIDED, SUPPORTED BY ROLL BEAARING AND TWO to 200 lbs. LOAD CELLS. THE
DIAMETER OD THE ROLLS IS 3" AND IT IS A TUBULAR CONSTRUCTION MOUNTED ON
BEARING BLOCKS ON ANTI FRICTION BEARINGS. THE BARREL OF THE ROLL IS GROUNDED
AND HARD CHROME PLATED. THIS IS USED TO GIVE THE TENSION FEEDBACK BETWEEN THE
BRIDLE AND RECOILER. TENSION MEASURING LOAD CELLS ARE PROVIDED TO MEASURE AND
CONTROL WRAP TENSION PECISELY AND PERMANENTLY TO ALLOW FOR A RELIABLE
PRODUCTION PROCESS.
14. AUTO EDGE WEB GUIDE SYSTEM WITH HYDRAULIC CYLINDER AND POWER PACK AT THE
EXSIT END OF THE BRIDLE A DEFLECTOR ROLL WITH LOAD CELL IS PROVIDED, WHICH HAS
A TUBULAR CONSTRUCTION MOUNTER ON BEARING BLOCKS ON ANTI FRICTION BEARINGS.
THE BARREL OF THE DEFLECTOR ROLL IS GROUNDED AND HARD CHROME PLATED.
15. RECOILER SYSTEM: IT CONSIST OF A REGULAR MANDREL BASED RECOILER
inside diameter of coil: 20"/24" (508mm/610mm)
maximum weight of the coil: 5,000 lbs. (2268 kg)
maximum coil width: 16" (406mm)
mandrel shaft face width: 26" (660mm)
expansion range: 20" to 24" (508mm - 610mm)
expansion/collapse: hydraulic
line speed: 125 fpm (38m/min.)
drive motor: 15 hp, 0-750-1500 rpm, ac motor
DESCRIPTION: IT IS USED TO WIND THE STRIP COMING FROM CLEANING LINE INTO A
COIL FORM AND IS DESIGNED FOR UNDER WINDING. THE CAPACITY OF THE RECOILER IS
5000 LBS. AND DRIVEN BY A 15HP AC MOTOR THROUGH A GEARED COUPLING AND
REDUCTION GEARBOX. THIS UNIT CONSISTS OF A FIXED BASE, MOVABLE HOUSING,
MANDREL SHAFT ASSEMBLY AND A PUSHER PLATE. MOVABLE HOUSING IS MOUNTED ON THE
FIXED FRAME ON MACHINED LUBRICATED GUIDE WAYS WITH REPLACEABLE WEAR STRIPS.
FIXED BASE IS GROUTED ON FOUNDATION. THE ACTUATION OF THE MANDREL HEAD
EXPANSION AND COLLAPSE WILL BE BY HYDRAULICALLY OPERATED MECHANISM FROM THE
FRONT SIDE OF THE HEAD ASSEMBLY. THE MANDREL HEAD WILL BE OF FOUR-SEGMENT
WEDGE TYPE ASSEMBLY. THE SEGMENTS ARE ATTACHED TO THE SLIDING SLEEVE THROUGH A
SERIES OF INTERLOCKING MACHINED WEDGE SURFACES. THE SEGMENTS WILL BE
RESTRAINED FROM SLIDING SLEEVE BY A FLANGE ON THE MANDREL THROUGH A WEAR
STRIP. A PNEUMATICALLY OPERATED PUSHER PLATE IS PROVIDED TO UNLOAD THE COILS
FROM THE MANDREL HEAD. THE LATERAL MOVEMENT OF THE RECOILER IS CONTROLLED BY
AN AUTOMATIC OPTO-HYDRAULIC EDGE GUIDE SYSTEM TO AVOID TELESCOPIC WINDING OF
COILS ON THE RECOILER. THE EDGE GUIDE SYSTEM MAINLY CONSISTS OF INFRARED
SENSOR, DIGITAL AMPLIFIER, ELECTRO HYDRAULIC POWER UNIT, SERVO CENTER AND A
HYDRAULIC CYLINDER.
15. HYDRAULIC POWER PACK & VALVE STAND: COMPLETE NECESSARY HYDRAULIC POWER
PACK + VALVE STAND SHALL BE PROVIDED FOR ENTRY AND EXIT SIDE EQUIPMENT OF THE
SLITTING LINE FOR PROPER AND SMOOTH OPERATION OF ALL THE HYDRAULIC CYLINDERS
AND HYDRAULIC MOTORS CONSIDERED IN THE LINE.
16. DRIVE SYSTEM FOR STRIP SUPPORT ROLLS AT FURNACE: THERE IS ONE STRIP
SUPPORT ROLLER AT THE ENTRY SIDE OF THE FURNACE. TO AVOID ANY SCRATCHES ON THE
STRIP SURFACE DURING STRIP TRAVEL WE WILL PROVIDE DRIVE SYSTEM(1.5 HP AC
MOTOR) TO THIS FURNACE ROLLER AND ITS SPEED IS SYNCHRONIZED WITH THE LINE
SPEED. THE DRIVE IS THROUGH A REDUCTION GEARBOX, UNIVERSAL COUPLING AND
SPROCKET AND CHAIN ARRANGEMENT.
BRIEF DESCRIPTION OF THE SYSTEM:
THESE ARE TECHNICAL SPECS FOR A CUSTOM ENGINEERED DRIVE SYSTEM TO POWER AND
CONTROL, CONTROLLED ATMOSPHERE BRIGHT ANNEALING LINE.
THIS CUSTOM ENGINEERED DRIVE SYSTEM WILL INCLUDE ASSEMBLIES OF MULTIPLE AC
DRIVE CONTROLS FOR THE INDIVIDUAL SECTION OF THE BA LINE PLUS ASSOCIATED
FURNACE CONTROL. THESE UNITS ARE MOUNTED IN A CONTINUOUS LINE-UP OF NEMA
CABINETS WITH INTERCONNECTING CONTROL FOR THE OPERATION AS AN INTEGRATED
SYSTEM.
ADDITIONAL PROCESSORS AND ASSOCIATED HARDWARE AND SOFTWARE ARE INCLUDED WITH
THE INDIVIDUAL DRIVE CONTROLS TO PROVIDE THE MASTER REFERENCE, LINE CONTROL
SEQUENCING AND OTHER SPECIFIED FUNCTIONS OF THE FURNACE. THESE INCLUDE THE
OPERATOR INTERFACE, DATA HANDLING, FAULT OR STATUS ANNUNCIATION, AND
COMMUNICATION WITH OTHER SYSTEMS.
IN ADDITION TO THE CONTROL EQUIPMENT, THIS CUSTOM ENGINEERED DRIVE SYSTEM
INCLUDES SEPARATELY MOUNTED AC MOTORS AND DRIVE TRANSFORMERS AND MISCELLANEOUS
TRANSDUCERS FOR MOUNTING ON THE BA LINE.
AS A CUSTOM ENGINEERED DRIVE SYSTEM, IT INCLUDES ALL SYSTEMS ENGINEERING AND
CUSTOM CONTROL ENGINEERING REQUIRED TO PRODUCE A WELL-COORDINATED DRIVE SYSTEM
THAT MEETS THE REQUIREMENT OF THE APPLICATIONS.
THE LINE CONSISTS OF FOLLOWING DRIVES (MOTORS)
UNCOILER: 7.5 HP, 0-1800 RPM - AC MOTOR - AC DRIVE GS2-4010
ENTRY TENSION BRIDLE: 5 HP, 0-1800 RPM AC MOTOR - AC DRIVE GS2-4010
ENTRY FURNACE ROLL: 1.5, 0-1800 RPM AC MOTOR - AC DRIVE GS1-22P0
JETCOOL ROLL X 2: 1.5 HP, 0-1800 RPM AC MOTOR - AC DRIVE GS1-22P0
JETCOOL GASTIGHT FAN: 15 HP 0-1800 RPM AC MOTOR - AC DRIVE GS1-22P0
EXIT TENSION BRIDLE: 7.5 HP 0-1800 RPM AC MOTOR - AC DRIVE GS2-4010
RECOILER: 15 HP 0-1800 RPM AC MOTOR - AC DRIVE GS3-4015
ALL DRIVES ARE DRIVEN BY AC MOTORS. THE AC MOTORS ARE CONTROLLED BY 4-QUADRANT
REVERSIBLE DIGITAL DC DRIVES. THE SPEED IS VARIED BY ARMATURE VOLTAGE CONTROL
PROVIDED BY REVERSIBLE THYRISTORS. THE AC DRIVES HAVE FIELD THYRISTORS TO
SUPPLY FIELD VOLTAGE. COMMUNICATING CHOKES ARE PROVIDED FOR BOTH FIELD AND
ARMATURE CIRCUITS TO PROTECT THE THYRISTORS FROM CURRENT SURGES. SEMICONDUCTOR
FUSES ARE PROVIDED FOR BOTH FIELD AND ARMATURE CIRCUITS TO PROTECT THE
THYRISTORS FROM OVER LOAD AND SHORT CIRCUITS. THE CRITICAL REQUIREMENT OF THE
SYSTEM IS TO MAINTAIN CONSTANT TENSION BETWEEN ENTRY AND EXIT BRIDLES. ANOTHER
CRITICAL REQUIREMENT IS TO MAINTAIN CONSTANT TENSION BEFORE THE RECOILER
IRRESPECTIVE OF DIAMETER BUILD UP. LOAD CELL # 1 IS INSTALLED BEFORE EXIT
BRIDLE TO GIVE ACTUAL TENSION FEEDBACK BETWEEN THE TWO BRIDLES AND LOAD CELL #
2 IS INSTALLED BEFORE RECOILER TO GIVE A FEEDBACK OF RECOILER TENSION. THE
LOAD CELLS WILL GIVE 4 - 20 MA PROPORTIONAL TO THE TENSION.
TENSION BRIDLES: EXIT BRIDLE IS USED AS A MASTER DRIVE AND THE LINE SPEED
REFERENCE WILL BE GENERATED FROM EXIT BRIDLE DRIVE AND THE OTHER DRIVES WILL
FOLLOW THE INCREASE OR DECREASE OF EXIT BRIDLE SPEED. EXIT BRIDLE IS IN SPEED
MODE AND THE ENTRY BRIDLE WILL BE IN TENSION MODE. THE DRIVE IS PROVIDED WITH
ADDITIONAL TECHNOLOGY CONTROLLER TO ACHIEVE TENSION CONTROL. THE OPERATOR WILL
SET THE TENSION. LOAD CELL # 1 MONITORS THE TENSION BETWEEN TWO BRIDLES AND
GIVES FEEDBACK OF ACTUAL TENSION. IN CASE OF DEVIATION IN ACTUAL TENSION,
ENTRY BRIDLE IS ADJUSTED BY THE FEEDBACK OF THE LOAD CELL # 1 TO INCREASE OR
DECREASE THE TENSION ACCORDINGLY.
FURNACE ROLLERS: ROLLS ARE PROVIDED INSIDE THE FURNACE TO SUPPORT THE STRIP.
THE ROLLS ARE DRIVEN AT LINE SPEED TO AVOID SCRATCHES ON THE STRIP. ENTRY
ROLLS ARE DRIVEN BY ONE MOTOR, MIDDLE ROLLER IS DRIVEN BY ONE MOTOR AND EXIT
ROLLER IS DRIVEN BY ANOTHER MOTOR. EACH MOTOR IS CONTROLLED BY DIGITAL AC
DRIVE. ALL DRIVES ARE IN SPEED MODE.
RECOILER: RECOILER IS CONTROLLED BY A DIGITAL AC DRIVE WHICH RUNS IN TENSION
MODE. THE DRIVE IS FITTED WITH ADDITIONAL TECHNOLOGY CONTROLLER TO ACHIEVE
TENSION CONTROLLER. THE OPERATOR SETS TENSION REFERENCE AND THE TENSION
FEEDBACK IS DERIVED FROM LOAD CELL # 2 MOUNTED BEFORE RECOILER. THE TENSION ON
THE STRIP IS MAINTAINED CONSTANT BETWEEN EXIT BRIDLE ROLL AND RECOILER.
18. HYDROGEN-NITROGEN BLEND PANEL SYSTEM: IT IS DESIGNED TO SUPPLY EITHER 100%
NITROGEN OR A BLEND OF HYDROGEN AND NITROGEN GASES AT CONTROLLED RATES AND
BLEND RATIOS FOR USE AS A PROTECTIVE ATMOSPHERE IN BRIGHT ANNEALING OPERATION.
THE ELECTRICAL PANEL CONTAINS A PROGRAMMABLE LOGIC CONTROLLER WHICH CONTROLS
THE BLEND PANEL. A NUMBER OF SAFETY INTERLOCKS MONITOR THE SYSTEM; THESE
INTERLOCKS ALLOW HYDROGEN FLOW ONLY WHEN SAFE OPERATING CONDITIONS EXISTS, AND
CONTROL THE INITIATION AND DURATION OF THE NITROGEN PURGE. THE CONTROL
ENCLOSURE CONTAINS THE ELECTRICAL EQUIPMENT NECESSARY FOR START-UP AND
SHUTDOWN
OF THE SYSTEM. THE PANEL INCLUDES THE PLC, FLOW INDICATORS, ROTA METERS,
SELECTOR SWITCHES, PUSH BUTTONS, INDICATING LINES AND EMERGENCY STOP BUTTONS.
**PRICE QUOTED AS IS WHERE IS SUBJECT TO PRIOR SALE**
**ALL SPECIFICATIONS ARE SUBJECT TO VERIFICATION BY PURCHASER**
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