US3538729A - Control system for strip coiling apparatus - Google Patents

Control system for strip coiling apparatus Download PDF

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Publication number
US3538729A
US3538729A US652454A US3538729DA US3538729A US 3538729 A US3538729 A US 3538729A US 652454 A US652454 A US 652454A US 3538729D A US3538729D A US 3538729DA US 3538729 A US3538729 A US 3538729A
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United States
Prior art keywords
strip
mandrel
coil
counter
trailing end
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Expired - Lifetime
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US652454A
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English (en)
Inventor
John D Sterrett Jr
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Westinghouse Electric Corp
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Westinghouse Electric Corp
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Publication date
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
    • B21C47/003—Regulation of tension or speed; Braking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
    • B21C47/02—Winding-up or coiling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H26/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions, for web-advancing mechanisms

Definitions

  • the present invention is particularly adapted for use with continuous hot strip rolling mills.
  • the strip As it proceeds from the last tandem finishing stand, is carried over a long table, called the runout table, and thence through pinch rolls to a downcoiler where it is wound into coils for shipment or further processing.
  • the hot strip has been coiled on such a downcoiler mandrel, it is necessary to position the trailing end of the strip under the coil before the coil is stripped from the mandrel. That is, when the coil is stripped from the mandrel, it is deposited onto rollers or guideways where it is conveyed, along a path extending parallel to the coil axis, to some remote location. If the trailing end of the strip is not beneath the coil such that the weight of the coil will restrain it on the aforesaid guideways, the end will possibly unwind or flop around, an obviously undesirable condition.
  • the present invention provides a control system for strip coiling apparatus which insures that the trailing end ofthe strip will come to rest at a preselected angular position about the mandrel on which it is coiled.
  • an object of the invention is to provide a control system for a hot mill downcoiler which positions the trailing end of the strip beneath the coil such that when the coil is stripped from the mandrel and deposited on guideways, the trailing end will be constrained from unwinding.
  • means are provided for sensing passage of the trailing end of the strip past a detecting device, together with means operative essentially just before passage of the trailing end of the strip past the detecting means for producing a first electrical signal indicative of the number of revolutions of the coiler mandrel required to wind on the coil the length of the strip between the detecting means and the coil. Further means are provided for producing a second electrical signal when the end of the strip passes the detecting means.
  • the sensing means the aforesaid first and second electrical signals are applied to apparatus which causes the mandrel to first rotate through a number of revolutions necessary to wind the remaining length of strip onto the coil, plus a predetermined arcuate distance, and then stop.
  • the strip end detecting means comprises a current or the like sensing means on a drive motor for Patented Nov. 10,1970
  • the strip usually makes approximately a tangential contact with the coil on which it is being wound at the top thereof, while the aforesaid predetermined arcuate distance is sutlicient to rotate the trailing end of the strip from the point of tangential contact at the top of the coil to a position beneath the coil.
  • the number of revolutions of the coiler mandrel required to wind the length of the strip between the coiler and the pinch rolls is dependent upon the diameter of the coil; and this diameter will gradually increase as the strip is being wound. Accordingly, the diameter of the coil is continually monitored. This is accomplished by means of first and second counters, the first of which counts pulses proportional to the number of revolutions of the coiler mandrel and the other of which counts pulses proportional to the number of revolutions of the pinch rolls.
  • the pinch roll counter is preset to count a fixed number of pulses indicative of the length of the strip between the pinch rolls and the coiler. Each time the predetermined count of the pinch roll counter is reached, it resets itself and also resets the aforesaid first counter which is counting the number of revolutions of the man drel coiler. The count of the first counter, upon passage of the trailing end of the strip through the pinch rolls, is then preset into a mandrel downcounter which counts down in an amount equal to the distance between the pinch rolls and the coiler plus the predetermined angular distance required to position the trailing end of the strip beneath the coil. After the mandrel down-counter has counted down, therefore, the trailing end of the strip will be at the bottom of the coil and the drive motor for the mandrel down-counter will be stopped.
  • FIG. 1 is a schematic illustration of a downcoiler showing the guideways on which the coil is transported at the completion of a coiling operation
  • FIG. 2 is a schematic circuit diagram illustrating the control system of the present invention for positioning the trailing end of strip material beneath the coil as shown in FIG. 1.
  • a hot strip downcoiler is schematically illustrated and includes a mandrel 10 driven by means of a suitable motor, not shown, and around which steel strip material 12 is wound.
  • the strip is normally constrained by means of rollers 14 which are movable radially inwardly or outwardly.
  • the rollers 14 are normally held in engagement with the coil during a coiling operation in order to constrain the strip, but are permitted to move radially outwardly as the coil expands.
  • the coil After the coil is wound, it is normally deposited onto skids or guideways 16 and 18 and then pushed along the guideways 16 and 18 to some remote location for further processing. However, before the coil is positioned on the guideways 16 and 18, it is necessary to position the trailing end of the strip, indicated at 20, beneath the coil in order that it will rest on the guideways 16 and 18. Otherwise, if the trailing end 20 is at the top of the coil, for example, it will flop around and the coil will begin tounwind. In the past, the trailing end of the coil 20 was normally positioned at the bottom of the coil by manual control on the part of the operator. Needless to say, this is a somewhat cumbersome and time-consuming operation.
  • the apparatus of the present invention for automatically positioning the trailing end 20 beneath the coil at the completion of a coiling operation is shown in FIG. 2.
  • the pinch roll 24, for example, is driven by means of motor 26.
  • the mandrel 10 is driven by means of a drive motor 28 provided with an external control winding 30.
  • the motor 28, in turn, is driven by a direct current generator 32 connected, in the usual case, to a three-phase alternating current motor 34.
  • the generator 32 is provided with a control winding 36 which is, in turn, connected to a generator control circuit 38. Control of the generator 32 via winding 36 and circuit 38, therefore, will also control the motor 28 in accordance with usual practice.
  • the trailing end of the strip should preferably be midway between points A and B shown in FIG. 2. Furthermore, if the trailing end of the strip rotates beyond point A, as when the mandrel is rotating too fast to stop at the desired position, it will be necessary to rotate the mandrel through an additional almost 360".
  • 0 is the distance, D, expressed as an angle, between the bite of the pinch rolls 40 and the point 42 of essentially tangential contact of the strip 12 with the coil
  • the value of (94- is determined by means including a tachometer pulse generator 44 connected to the mandrel 10.
  • the output pulses from the generator 44 are, in turn, applied as input pulses to a mandrel up-counter 62. It will be appreciated that the number of revolutions of the mandrel required to coil a given length of strip will be dependent upon the diameter of the coil, the greater the diameter, the fewer the number of required revolutions. Therefore, in order to rotate the mandrel 10 through an arcuate distance equal to (0+), it is necessary to continuously monitor the diameter of the coil. This is accomplished by means including a second tachometer pulse generator 47 connected to the pinch roll 24.
  • the output of the tachometer generator 47 will be a series of pulses, the number of which is proportional to the length of the strip passing between the pinch rolls. These pulses are applied to a pinch roll counter 50 which will produce an output on lead 52 after it has counted a number of pulses corresponding to the distance D, or 0, between points 40 and 42.
  • the pinch roll counter 50 When the pinch roll counter 50 thus reaches the count corresponding to the distance D, it resets itself via lead 54 and again begins counting until it reaches a count corresponding to the distance D.
  • the output pulse on lead 52 resets the mandrel up-counter 62 and enables a gate 58 to transfer the count from counter 62 to a mandrel down-counter 48.
  • the pulse generator 44 produces 1000 pulses during the time required to wind a length of strip equal to the distance D.
  • the mandrel up-counter 62 therefore, will count 1000 pulses until it is reset by a pulse on lead 52, whereupon it will transfer the count to the mandrel downcounter 48 which is preset to the count of the mandrel up-counter 62 plus a number of pulses necessary for the mandrel to rotate through the distance or arc
  • This latter number will be fixed regardless of the diameter of the coil.
  • the count stored in counter 48 is 1050.
  • the number of revolutions required to wind a length of strip equal to D decreases.
  • the number of pulses produced at a larger diameter by the pulse generator 44 during winding of a length of strip equal to D is 500.
  • the mandrel up-counter 62 will count up to 500, whereupon a pulse on lead 52 will reset it and open gate 56 to transfer the count to the mandrel down-counter 48.
  • the count stored by counter 48 will now be 550 rather than 1050. In this manner, it can be seen that as the coil diameter increases during a coiling operation, the count stored in the mandrel down-counter 48 will be periodically decreased. This action will continue with the count of counters 62 and 48 being changed periodically (i.e., each time the counter counts up to the distance D and produces an output pulse) until a gate circuit 58 is opened or enabled to apply pulses from generator 44 to the mandrel down-counter 48.
  • the gate 58 is opened by means of a current sensing magnetic amplifier connected across one of the input leads to the drive motor 26.
  • a current sensing magnetic amplifier connected across one of the input leads to the drive motor 26.
  • the magnetic amplifier 60 will produce an output on lead 46 to open the gate 58.
  • the magnetic amplifier 60 is only one type of device for sensing the passage of the trailing end of the strip beyond the point at which the distance D begins. That is, photocells, magnetic detecting devices or the like can be used with equal effectiveness to produce a signal which opens the gate 58.
  • the pulses from pulse generator 44 are applied to the mandrel down-counter 48 which proceeds to count down from the value (t9+).
  • the output of the mandrel down-counter 48 is applied to a digital-to-analog converter and function generator 64 which will apply a control signal to the gen erator control circuit 38 via lead 66 to stop the generator 32 and motor 28 when the count of counter 48 indicates that the count has been decreased almost to Zero.
  • the digital-to-analog converter 64 its output will gradually decrease as the counter 48 counts down whereby the rotational speed of the motor 28 and mandrel 10 also gradually decreases to the point where the mandrel stops with the trailing end of the strip ahead of point A.
  • the count of counter 48 will not be exactly zero. If, however, the count of counter 48 should reach zero, indicating that the trailing end of the strip has passed point A, the counter 48 will be reset via lead 68 to rotate the mandrel 10 through something less than 360 whereby the coil will come to rest with the trailing end of the strip preferably midway between points A and B.
  • the mandrel upcounter '62 produces a first output signal (which can be on a plurality of leads) indicative of the number of revolutions of the mandrel required to wind a length of strip equal to the distance D.
  • a second electrical signal is produced by circuit 60; and these two signals activate the down-counter 48, converter 64 and circuit 38 to rotate the mandrel through a number of revolutions equal to or slightly less than (H+), whereupon it stops.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Winding, Rewinding, Material Storage Devices (AREA)
US652454A 1967-07-11 1967-07-11 Control system for strip coiling apparatus Expired - Lifetime US3538729A (en)

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Application Number Priority Date Filing Date Title
US65245467A 1967-07-11 1967-07-11

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US3538729A true US3538729A (en) 1970-11-10

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US (1) US3538729A (enrdf_load_stackoverflow)
FR (1) FR1576668A (enrdf_load_stackoverflow)
GB (1) GB1233057A (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3898436A (en) * 1974-03-22 1975-08-05 Armco Steel Corp Coil diameter control system
US3953713A (en) * 1974-11-04 1976-04-27 Westvaco Corporation Reel diameter discriminator
US4001562A (en) * 1974-09-09 1977-01-04 Molins Limited Speed sensing devices
US4001552A (en) * 1975-04-04 1977-01-04 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Method and apparatus for measuring web material wound on a reel
US4052599A (en) * 1974-04-25 1977-10-04 Bethlehem Steel Corporation Method and apparatus for determining coil sheet length
AT383755B (de) * 1986-02-28 1987-08-25 Voest Alpine Ag Haspelvorrichtung fuer ein blechband
CN113245398A (zh) * 2021-04-29 2021-08-13 广西钢铁集团有限公司 双臂芯轴旋转定位方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1882219A (en) * 1929-03-22 1932-10-11 Cutler Hammer Inc Controller for motor driven machines
US3028114A (en) * 1959-09-21 1962-04-03 Kloeckner Werke Ag Arrangement for coiling metal strip material
US3208683A (en) * 1962-12-03 1965-09-28 Gen Electric Automatic control systems for rolling mills

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1882219A (en) * 1929-03-22 1932-10-11 Cutler Hammer Inc Controller for motor driven machines
US3028114A (en) * 1959-09-21 1962-04-03 Kloeckner Werke Ag Arrangement for coiling metal strip material
US3208683A (en) * 1962-12-03 1965-09-28 Gen Electric Automatic control systems for rolling mills

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3898436A (en) * 1974-03-22 1975-08-05 Armco Steel Corp Coil diameter control system
US4052599A (en) * 1974-04-25 1977-10-04 Bethlehem Steel Corporation Method and apparatus for determining coil sheet length
US4001562A (en) * 1974-09-09 1977-01-04 Molins Limited Speed sensing devices
US3953713A (en) * 1974-11-04 1976-04-27 Westvaco Corporation Reel diameter discriminator
US4001552A (en) * 1975-04-04 1977-01-04 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Method and apparatus for measuring web material wound on a reel
AT383755B (de) * 1986-02-28 1987-08-25 Voest Alpine Ag Haspelvorrichtung fuer ein blechband
CN113245398A (zh) * 2021-04-29 2021-08-13 广西钢铁集团有限公司 双臂芯轴旋转定位方法

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Publication number Publication date
FR1576668A (enrdf_load_stackoverflow) 1969-08-01
GB1233057A (enrdf_load_stackoverflow) 1971-05-26

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