Title:
Coil-handling apparatus
United States Patent 2262118


Abstract:
This invention relates to coil-handling apparatus, and more particularly to apparatus for handling coils of strip material from the time they reach an uncoiler's loading station until they are unwound by strip-processing apparatus. 6 Heretofore coiled metal strip has generally been deposited...



Inventors:
Sieger, Maurice P.
Application Number:
US25959539A
Publication Date:
11/11/1941
Filing Date:
03/03/1939
Assignee:
UNITED ENG FOUNDRY CO
Primary Class:
Other Classes:
72/183, 72/237, 242/559.4, 242/561, 242/562, 414/684, 414/908
International Classes:
B21C47/24
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Description:

This invention relates to coil-handling apparatus, and more particularly to apparatus for handling coils of strip material from the time they reach an uncoiler's loading station until they are unwound by strip-processing apparatus. 6 Heretofore coiled metal strip has generally been deposited on a vertically movable saddle or cradle disposed between and below a pair of horizontally movable spindles forming part of an uncoiler. The spindles are moved towards each 1 other to receive the coil from the raised cradle, and the empty cradle is then lowered. The outer end of the coiled strip is then pulled away from the coil and led to strip-engaging apparatus which feeds it into strip-processing apparatus, 1 such as a rolling mill. Even if possible, it is not feasible to place a new coil on the cradle until the preceding one has been entirely unwound. During the time that a new coil is being loaded onto the cradle, raised into the uncoiler, received by I the uncoiler spindles, and started into the stripprocessing apparatus the latter runs idle. As steel mill machinery and its operation are very expensive, this periodic idleness totals up to a material production loss every day. Additional factors that contribute to the length of time required to mount a new coil in the uncoiler are the slow speed at which the spindles must be moved toward each other to prevent their damaging the edges of the coil strip by impact therewith, and the delay incident to entering the leading end of the strip into strip-feeding means. Furthermore, the portion of the outer convolution of the coil which has to be pulled away from the coil in order to start the leading end of the strip into the processing apparatus is often marked or excessively bent during this opening operation, whereby coil-breaks and other flaws which can not be eliminated by subsequent finishing operations are caused and cropping of the damaged end portion is necessitated.

It is among the objects of this invention to materially shorten the idle periods of strip-processing apparatus due to periodic charging of the uncoiler with new coils of strip, and to substantially eliminate the necessity for cropping arising from opening a coil to permit the leading end of the strip to be fed to the processing apparatus. More specific objects are to provide coilhandling apparatus in which a coil is mounted on a cradle ready for quick mounting in an uncoiler while the preceding coil is being unwound, in which the leading end portion of the strip is bent away from the coil by a non-marking device ah amount Insufficient to cause breaks, in which thi leading end is quickly entered into the stripfeeding apparatus without damage, in which uncoiler spindles are moved toward each other rapidly without damaging the ends of the coil, and in which several operations may be performed at the same time instead of in sequence.

The preferred embodiment of this invention is illustrated in the accompanying drawings in which Fig. 1 is a plan view of my coil-handling o apparatus adjoining a rolling mill; and Fig. 2 is a side view of the apparatus taken on the line I--II of Fig. 1, but showing the loading platform gate in lowered position.

Referring to the drawings, an inclined platform 10 that forms a loading station for an uncoiler 120 is supported by frame I I over a pit in which a coil manipulator 80 is disposed. Coils 12 (Fig. 2) of tightly wound metal strip are deposited on incline 10 by any suitable means, such i0 as a crane, and are prevented from rolling off the sides of the incline by adjustable side guards 15. The lower or discharge end portion of the incline is formed principally by a gate 20 having fingers 26 projecting rearwardly between for25 wardly extending fingers 16 of the main body of the incline. The gate is keyed on a shaft 22 rotatably mounted in a frame 24 below the incline.

As shown in Fig. 1, raising and lowering of the gate is effected by rocking shaft 22 that is opers n atively connected through a speed-reducing gear unit 44 with a reversible electric motor 45 provided with a magnetic brake 46. The speed-reducing unit may be made self-locking by using a worm drive. A limit switch 47 driven through 3r a speed-reducing gear unit 48 by motor 45 breaks the circuit to the motor, energizes the magnetic brake, and operates a reversing switch (not shown) in both positions of the gate. The raised position of the gate is shown in full lines in Fig. 1 40 and in broken lines in Fig. 2. In this position the gate serves as a stop for the coils deposited on incline 10. When the gate is lowered, the first coil rolls down the incline to the position of coil 12' where it rests on coil manipulator 80. 45 To permit the gate to be swung upwardl' past the overhanging portion of coil 12', an apron 28 hinged to the discharge end of the gate swings downwardly relative to the gate when the latter is raised. The apron is normally held in line 50 with the. gate by levers 32 which are secured to the sides of the apron And are connected by coil springs 34 to the gate. The apron and gate are supported in lowered position by abutments 38 and 48, respectively, which engage a fixed memS55 ber beneath them.

Disposed below the lower end of incline 10 is coil opener 50 comprising two laterally space standards 52 each of which carries a pivot pin 5 on which is mounted a gear segment 54 and lever arm 56. The'two arms carry at their oute ends a gripping device adapted to pull the oute end portion of the strip away from the coil. Al though many different types of such gripping de vices may be employed, for handling magnetical ly permeable material it is preferred to use ai electromagnet 60 pivotally mounted at 62 on th lever arms. The pole pieces 64 which projec from the magnet are adjustable for engagemen with cylindrical coil surfaces of different curva. tures, due to coils of different diameters. Mesh. ing with gear segments 54 are pinions 66 keyec to a shaft 68 which is journaled in bearings 69 on standards 52. As shown in Fig. 1, this shaft is operably connected through a speed-reducing gear unit 70 to a reversible motor 72 having a magnetic brake 74. Control means, shown to be operated by a hand lever 79, sets a limit switch 76 to stop magnet 60 in any desired top position and in an unvarying bottom position. As the magnet is swung downwardly by arm 56 (gate 20 having previously been raised), it pulls the outer end portion of the coiled strip back and down over a bending anvil 42 mounted between standards 52.

Coil 12' is supported on manipulator 80 by rollers 82 and 84 carried by a cradle 86 slidably mounted in the head portion of a vertical plunger 88 disposed in a fluid pressure cylinder 90 carried by a carriage 98. Roller 84 is connected through a chain and sprocket drive 92 and speed-reducing gear unit 94 with a reversible motor 96 rigidly mounted in the cradle. The carriage has a front upright 100 that serves as a stop to limit forward motion of the slidably mounted cradle which carries bumpers 102 urged forward by coil springs 104. When the coil rolls off the loading platform and onto rollers 82 and 84 it pushes the cradle forward against upright 100, but the bumpers and springs absorb the force of this loading impact.

Another feature of this invention is to permit the cradle to be moved laterally from its coilreceiving position to uncoiler 120. Accordingly, carriage 98 is provided with flanged wheels 106 mounted on tracks 108 that extend forwardly from beneath coil opener 50 to a point below the uncoiler, and the carriage is moved back and forth on these tracks by fluid pressure motor 112 connected to the carriage through rod 114. Elevating cylinder 90 is connected to a source of fluid under pressure by means of a flexible tube 1 6 (Fig. 2) which does not interfere with the movements of the carriage.

The uncoiler 120 comprises two substantially similar devices mounted on both sides of the pit or coil conveyor 80. Each device includes par- 6 allel tracks 122, slidably mounted on which is a pedestal 124 provided with an upright portion 126 in which a coil-supporting spindle 128 is journaled. As shown in Fig. 1, each spindle has a tapering end and a limiting flange 130, and its 6 shaft is encircled by a brake drum 132 actuated by a lever 136 for regulating the resistance of the spindle to turning in order to put tension on the strip as it is being unwound. Pedestals 124 are moved toward and away from each other 70 by rigidly mounted double action fluid pressure motors 140, the pistons of which are rigidly connected by rods 142 to the pedestals. The two motors are connected by pipes 145 to a common header (not shown). 75 a The outermost positions of pedestals 124 are d limited by motors 140 but their inner positions 8 are determined by stops 146 slidably mounted a on tracks 122. These stops are moved toward r and away from each other in unison by threaded r shafts 148 driven through bevel gears 154 (Fig. - 1) and speed-reducing gear unit 156 by a rever- sible electric motor 158. The two threaded shafts - are connected together at their inner ends by a n 10 connecting shaft 149 that is broken away in Fig. e 1 so as to more clearly show the underlying elet ments. This motor also rotates the pointer 162 t of an indicator 164 which shows at all times on a - graduated dial the position of stops 146.

" 15 Strip-feeding apparatus 170, by which strip is fed from a coil in the uncoiler to mill 200, includes a lower pinch roll 174 journaled in a frame 172 Swhere it is driven through a spindle 176 by an electric motor 180, as shown in Fig. 1. The top pinch roll 184 is carried by the upper arms of a pair of laterally spaced bell cranks 186 that are rockably mounted at 188 on frames 172. The lower arms of the cranks are operatively connected to the upper ends of piston rods 190 vertically reciprocable in fluid pressure cylinders 192.

This construction permits the upper roll to be swung upwardly a considerable distance away from the lower roll to allow the leading end of the strip to be quickly fed between them, where.0 upon the top roll is lowered and the strip is fed through adjustable guides 202 to rolling mill 200, or to any other desired strip-processing apparatus.

In the operation of this apparatus a coil 12 S3 is deposited on inclined platform 10 and allowed to roll down against upraised gate 20. Additional coils may be deposited on the incline and prevented by wedges from following the first coil over the gate when the latter is lowered. Coil manipulator 80 is moved to the position below coil opener 50 shown in broken lines in Fig. 2.

In this position the axes of cradle roller 84 and pivot pins 58 of the coil opener are in the same vertical plane. Fluid pressure is admitted to car4 riage cylinder 90 whereby plunger 88 and cradle 86 are lifted until the axis of roller 84 coincides with that of pivot pins 58. The positions of rollers 82 and 84 at this time are indicated in broken lines in Fig. 2. Gate 20 is then lowered so that 0, the first coil 12 may roll over it and into the Position of coil 12' where it is supported by the cradle rollers. The gate is then raised, apron 28 permitting it to swing upwardly past the overhanging portion of coil 12'. The next succeeding 5 coil 12 is then permitted to roll down against the upright gate.

Cradle roller 84 is turned by motor 96 mounted in the cradle to rotate coil 12' until the outer end of its strip is substantially at the top of the 0 coil. Electromagnet 60 is then swung upwardly by arms 56 through the space just previously occupied by gate 20. When in its upper position, indicated in broken lines in Fig. 2, the pivotally mounted magnet grips the outer end portion of Sthe strip and is then swung downwardly to its original position beneath the incline. As the magnet pulls the outer portion of the strip away from the coil it bends it back over cradle roller 84 and down over the top of bending anvil 42.

The upper surface of this anvil is curved and forms with the adjacent curved surface of roller 84 a substantially continuous curved surface over which the strip is bent. The diameter of roller 84 and the radius of the curved bending anvil are great enough to prevent breaks or damaging stresses in the strip, but they are small enough to permit the strip to be bent beyond its elastic limit in order to permanently bend the leading end portion of the strip away from the coil. After the strip has been bent over anvil 42 electromagnet 60 is deenergized, whereupon the released bent portion of the strip swings upwardly to some extent, depending upon its resiliency.

Coil 12' is then rotated again by cradle roller 84 to bring the outwardly bent portion of the strip into the upper and generally horizontal position shown in broken lines in Fig. 2.

The foregoing coil-preparing operations can all be performed while a preceding coil is being unwound in uncoiler 120. As soon as such a coil is entirely unwound, uncoiler pedestals 124 are moved apart by fluid pressure motors 140, and pedestal stops 146 are moved either toward or away from each other the necessary distance if coil 12' is of a different length than the preceding one. Fluid pressure motor 112 then moves carriage 98 forward on tracks 108 until the coil carried by the elevated cradle is in the position shown by coil 12" in Fig. 2, wherein the axis of the coil is substantially in line with the axes of uncoiler spindles 128. If necessary, cradle 86 may be raised or lowered to produce this alignment. In moving the coil laterally into position in the uncoiler the outstretched leading end of the strip is positioned directly above pinch roll 174 of the strip-feeding apparatus, the other roll 184 having been raised to prevent it from interfering. Roll 184 may then be swung downwardly, by cylinder 192, to its broken line position in Fig. 2, whereby the strip is gripped between the two rollers.

As soon as cradle 86 positions coil 12" between the uncoiler spindles, pedestals 124 are moved inwardly by motors 140 to insert the spindles in the ends of the coil. As the coils generally ar not exactly centered longitudinally relative to the spindles, one of the two spindles will engag4 the coil before the other and then slow down iI its lateral movement on account of the increasec resistance offered by the coil which it slides slow ly along the cradle rollers until the spindle i arrested by the adjacent stop 146. Just befor this arrest of movement the opposite end of th coil is pushed over the other spindle which il the meantime has been moved as far inwardl as allowed by its stop 146. The equalizing effec of the common header of the two fluid pressur motors 140 permits the second spindle to mov faster than the first spindle that meets wit greater resistance by engaging the coil firs whereby the engaged coil is shifted gradually an without destructive impact. This beneficial el feet is further enhanced by the compressibilil of the pressure fluid in the motors 140.

After coil 12" has been thus mounted in tl uncoiler where it is supported by spindles 12 the empty cradle 86 may be lowered to the ft line position shown in Fig. 2 by releasing tl pressure fluid from cylinder 90. Carriage 98 then moved to the right by motor 112, and t] cradle is again elevated in order to receive t next coil 12' from the loading platform. Wh the cradle is being reloaded and the coil openc coil 12" is unwound and fed by feeding app ratus 170 into rolling mill 200. Although a ro ing mill has been illustrated in the drawings, will be obvious that the coil-handling apparat disclosed herein may be used with any ott type of strip-processing apparatus, such as shear, continuous pickler, etc.

It will thus be seen that with this apparatus very little time is spent in placing a new coil in the uncoiler after the preceding one has been unwound, because the second coil is mounted on the cradle and opened while the first one is being unwound. Likewise, the leading end of the strip is positioned in the feeding apparatus more or less automatically when a coil is moved into the uncoiler. As a result, the strip-processing apparatus is idle for only a very short time and production is thereby speeded up. The coil opener does not mark the strip, and it bends the leading end portion away from the coil without breaking or otherwise injuring the strip. The uncoiler also receives coils without damaging the edges of the strip.

According to the provisions of the patent statutes, I have explained the principle and construction of my invention and have illustrated and described what I now consider to represent its best embodiments. However, I desire to have it understood that, within the scope of the appended claims, the invention may be practiced otherwise than as specifically illustrated and described.

I claim: 1. Coil-handling apparatus comprising an uncoiler, a cradle adapted to receive a coil of strip material at a point laterally spaced from the uncoiler, means disposed adjacent said coil-receiving point for bending the outer end portion of said strip away from the coil mounted on said cradle, means for moving the cradle substantially horizontally to the uncoiler for delivering the coil thereto, and means for lowering the empty cradle beneath the uncoiler and returnS ing it to said coil-receiving point.

2. Coil-handling apparatus comprising an uncoiler, a cradle adapted to receive a coil of strip S40 material at a point laterally spaced from the unS coiler, means disposed adjacent said coil-receiving point for bending the outer end portion of e said strip away from the coil mounted on said i cradle, means for moving the cradle toward the - , uncoiler for delivering the coil thereto, means s for moving the cradle vertically beneath the une coiler, pinch rollers disposed adjacent the une coiler, and means for spreading said rollers wide n apart for receiving between them said outer end y 50 portion of the strip.

yt 3. Coil-handling apparatus comprising an une coiler, tracks disposed below the uncoiler and ,e extending laterally away from it, a carriage h mounted on the tracks, a vertical cylinder cart, 55 ried by the carriage, a plunger disposed in the Ad cylinder, a coil-receiving cradle slidably mounted E_ on the plunger, said carriage being provided with ty means for limiting sliding of the cradle thereon, resilient buffer means disposed between the ie 60 cradle and said limiting means, means for mov8, ing the carriage along the tracks, and means ll for introducing fluid under pressure into said le cylinder to elevate the plunger and cradle. is 4. Coil-handling apparatus comprising an untie 65 coiler, a support for coils spaced therefrom, a te cradle adapted to receive a coil of strip material ile from said coil support, means disposed at the ed, delivery end of said coil support for bending a- the outer end portion of said, strip away from l- 70 the coil on said cradle, means for moving the it cradle substantially horizontally to the uncoiler us for delivering the coil thereto, means for lowerier ing the empty cradle beneath the uncoiler, pinch a rollers disposed adjacent the uncoiler, laterally spaced arms pivoted on a horizontal axis and carrying one of said rollers at their free end, and means for swinging said arms on their pivots to swing the roller carried thereby away from the other roller.

5. Coil-handling apparatus comprising a pair of axially aligned spindles, a cradle adapted to receive a coil of strip material at a point laterally spaced from the spindles, means for moving the cradle toward the spindles to locate the coil between them, means for moving the spin- 1 dles toward each other to project them into the ends of the coil, stops limiting the inward movement of the spindles, means for adjusting the stops toward andc away from each other in unison, and means for lowering the empty cradle 1 from the spindles and coil.

6. Coil-handling apparatus comprising an uncoiler, a loading platform spaced therefrom, a cradle for receiving a coil of metal strip from the platform and transporting it to the uncoiler, means for lowering the empty cradle below the uncoiler, a bending anvil disposed adjacent the delivery end of the platform, and means for bending the outer end portion of said strip away from the coil and back over said anvil. 7. Coil-handling apparatus comprising an uncoiler, a loading platform spaced therefrom, a cradle for receiving a coil of metal strip from the platform and transporting it to the uncoiler, means for lowering the empty cradle below the uncoiler, a bending anvil disposed adjacent the platform, and means for bending the outer end portion of said strip away from the coil and back over said anvil, the curvature of the anvil being such as to bend the strip beyond its elastic limit without weakening it.

8. Coil-handling apparatus comprising an uncoiler, a loading platform spaced therefrom, a cradle for receiving a coil of metal strip from the platform and transporting it to the uncoiler, means for lowering the empty cradle below the uncoiler, a bending anvil disposed adjacent the platform, laterally spaced arms pivoted on a horizontal axis, an electromagnet carried by the outer ends of the arms for engaging the outer end portion of said strip, and means for swinging said arms to cause said magnet to pull said end portion away from the coil and bend it back 0 over said anvil.

9. Coil-handling apparatus comprising an uncoiler, a loading platform spaced therefrom and having a vertically movable delivery end portion, a cradle for receiving a coil of metal strip 5 from said end portion of the platform and transporting it to the uncoiler, means for moving the cradle vertically below the uncoiler, a bending anvil mounted below said end portion of the platform, means for raising said end portion to uncover the anvil, and means for pulling the end of said strip away from the coil and bending it back over said anvil.

10. A coil handling apparatus comprising horizontally disposed spindle means, axially movable for.engaging the center of the coil and supporting it for rotation, a coil supporting carriage mounted for movement below said spindle means and on tracks extending at right angles to the axis of said spindle means, coil supporting means on said carriage, elevating means for raising and lowering said coil supporting means and power means for moving said carriage on said tracks to and from a loading position registering with said spindle means whereby a coil may be mounted on said coil supporting means while another coil is being unwound from said spindle means and moved with a minimum time interval to a position registering with said spindle means.

MAURICE P. SIEGER.