JP5741258B2 - Method and apparatus for preventing meandering of steel strip - Google Patents

Description

  The present invention relates to a steel strip continuous processing line equipped with a steel strip continuous processing apparatus that continuously performs processing such as annealing, plating, painting, and washing of a steel strip, and enters the continuous steel strip processing apparatus. The present invention relates to a method and an apparatus for appropriately preventing meandering of the tail end of a paid-out steel strip when a plurality of payoff reels for alternately feeding out steel strips (coils) are provided as equipment.

  In the steel strip continuous processing line equipped with a steel strip continuous processing device that continuously performs processing such as annealing, plating, painting, washing, etc. of the steel strip, as the entrance equipment to the steel strip continuous processing device, Generally, it has a plurality of (for example, two) payoff reels, and when the payout of the steel strip (preceding steel strip) from one payoff reel is completed, the next steel strip (following) is started from the other payoff reel. The tip of the steel strip is dispensed, and then the tip of the traveling steel strip and the tail end of the preceding steel strip are welded with a welding device, and the steel strip is continuously dispensed. In detail, the defective part of the tail end of the preceding steel strip and the defective part of the leading end of the succeeding steel strip are cut and removed by a cutting device, respectively, so that the tail end and the following of the newly formed preceding steel strip are formed. The tip of the steel strip is welded with a welding device.

  At that time, the tail end of the preceding steel strip that has fallen off from the pay-off reel, that is, paid out from the pay-off reel, is no longer restrained by the pay-off reel. During the period until welding, meandering is likely to occur. And if this meander becomes large, the steel strip ears will hit the guide and be damaged, it must be removed from the transport roller before reaching the welding device, and the transport of the steel strip must be stopped, There arises a problem that a gap occurs in the width direction from the leading end of the belt, and it becomes necessary to perform re-welding, or breaks easily during subsequent line conveyance. Stopping conveyance, re-welding or breaking of the steel strip leads to stopping of the entire line.

  Therefore, as a method to prevent meandering of the tail end of the preceding steel strip, the pinch roll on the welding device outlet side is closed, and the brake is applied with the pinch roll on the welding device outlet side to give back tension in the line. Method (refer to Patent Document 1) and a pinch roll installed on the welding device outlet side can be rotated in the width direction of the steel strip, and the pinch roll can be rotated according to the meandering of the tail end of the preceding steel strip To prevent meandering (see Patent Document 2) and a tilting roll that can be tilted in the vertical direction on the exit side of the welding apparatus, and tilting the tilting roll according to the meandering of the tail end of the preceding steel strip A method of controlling meandering (see Patent Document 3) has been proposed.

JP 2002-321011 A JP 09-010836 A Japanese Patent Laid-Open No. 10-263694

  However, in the method described in Patent Document 1, the tail end of the preceding steel strip slips out from the payoff reel, that is, until the tail end of the preceding steel strip is discharged from the payoff reel and reaches the welding apparatus. The steel strip is conveyed while being pinched by the pinch roll on the welding device exit side, but at this time, the tail end of the preceding steel strip upstream from the pinch roll on the welding device exit side is in a state where no tension is applied. In addition, since the tail end of the preceding steel strip can move freely in the width direction, the meandering phenomenon of the preceding steel strip occurs.

  Moreover, in the method of patent document 2, since the tail end of a preceding steel strip is allowed to meander and the pinch roll is rotated according to the meandering, it is prevented appropriately depending on the amount of meandering generated. There are cases where this is not possible.

  Moreover, in the method of patent document 3, it is necessary to install a tilting roll newly, and securing of the installation cost and installation space for that becomes a problem.

  The present invention has been made in view of the circumstances as described above, and is a continuous steel strip provided with a steel strip continuous processing apparatus that continuously performs processing such as annealing, plating, painting, and washing of the steel strip. In the processing line, as the entry side equipment to the steel strip continuous treatment apparatus, when having the entrance side equipment that alternately pays out the steel strip (coil) from a plurality of payoff reels, the equipment was paid out from the payoff reel. An object of the present invention is to provide a method and an apparatus for preventing the meandering of a steel strip that can appropriately prevent the tail end of the rear end of the steel strip.

  In order to solve the above problems, the present invention has the following features.

[1] In a steel strip continuous processing line provided with a steel strip continuous processing apparatus that continuously processes steel strips while being transported, the steel strips are alternately paid out as an entrance facility to the steel strip continuous processing device. A plurality of payoff reels, a cutting device that cuts and removes defective portions at the front end portion and tail end portions of the steel strip alternately paid out from the plurality of payoff reels, After cutting and removing the defective portion of the tail end portion with the cutting device, the tip portion of the preceding steel strip and the other payoff reel are paid out and the defective portion of the tip portion is cut and removed with the cutting device. A welding device that welds the tip of the trailing steel strip, a pinch roll (pinching roll between the cutting device and the welding device) that is disposed between the cutting device and the welding device and that rotates between the steel strip, and Arranged on the exit side of the welding equipment When is it and a pinch roll (welding device outlet side pinch roll) for rotating sandwiches the steel strip,
Before the tail end of the preceding steel strip is withdrawn from the payoff reel, the preceding steel strip is sandwiched between the cutting device-welding device pinch roll and the welding device outlet pinch roll, and the tail end of the preceding steel strip is the trailing steel During conveyance until the end of the belt is welded by the welding device, the peripheral speed of the welding device outlet side pinch roll is made slower than the conveying speed of the preceding steel belt, and the circumference of the pinch roll between the cutting device and the welding device is reduced. A method for preventing meandering of a steel strip, characterized in that the speed is made slower than the peripheral speed of the welding device outlet side pinch roll.

  [2] The steel strip according to [1], wherein the pinch roll between the cutting device and the welding device and the welding device outlet side pinch roll are pinch rolls having a convex center shape in the roll width. To prevent meandering.

[3] In a steel strip continuous processing line equipped with a steel strip continuous processing apparatus that continuously processes steel strips while being transported, steel strips are alternately paid out as an entrance facility to the steel strip continuous processing device. A plurality of payoff reels, a cutting device that cuts and removes defective portions at the front end portion and tail end portions of the steel strip alternately paid out from the plurality of payoff reels, After cutting and removing the defective portion of the tail end portion with the cutting device, the tip portion of the preceding steel strip and the other payoff reel are paid out and the defective portion of the tip portion is cut and removed with the cutting device. A welding device that welds the tip of the trailing steel strip, a pinch roll (pinching roll between the cutting device and the welding device) that is disposed between the cutting device and the welding device and that rotates between the steel strip, and Arranged on the exit side of the welding equipment A pinch roll (welding apparatus output side pinch roll) that is rotated by sandwiching the steel strip, and a pinch roll control device that controls the movement of the cutting apparatus / welding apparatus pinch roll and the welding apparatus output side pinch roll. Have
The pinch roll control device sandwiches the preceding steel strip between the cutting device-welding device pinch roll and the welding device outlet pinch roll before the tail end of the preceding steel strip is paid out from the payoff reel. During the conveyance until the tail end of the steel strip is welded to the tip of the subsequent steel strip by the welding device, the peripheral speed of the welding device outlet pinch roll is made slower than the transport speed of the preceding steel strip, and the cutting device An apparatus for preventing meandering of a steel strip, characterized in that a peripheral speed of a pinch roll between welding apparatuses is made slower than a peripheral speed of the outlet pinch roll of the welding apparatus.

  [4] The steel strip according to [3], wherein the pinch roll between the cutting device and the welding device and the welding device outlet side pinch roll are pinch rolls having a convex center shape in the roll width. Anti-meandering device.

  In the present invention, in a steel strip continuous processing line equipped with a steel strip continuous processing apparatus that continuously performs processing such as annealing, plating, painting, and washing of steel strip, the steel strip is alternately arranged from a plurality of payoff reels. In the case where the entry side equipment for paying out the (coil) is provided, it is possible to appropriately prevent the tail end of the steel strip from slipping out from the payoff reel, that is, after being paid out from the payoff reel. As a result, it is possible to prevent damage to the steel strip ears and stop the conveyance of the steel strip, and to efficiently and satisfactorily treat the steel strip.

It is a figure which shows the steel strip continuous processing line in one Embodiment of this invention. It is a figure which shows the example of the pinch roll used in one Embodiment of this invention. It is a schematic diagram which shows the time transition of the conveyance speed of the steel strip in one Embodiment of this invention, and the peripheral speed of a pinch roll. It is a comparison result of the amount of meandering of the example of the present invention and the comparative example in Example 1 of the present invention.

  An embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a side view showing a steel strip continuous treatment line 1 in one embodiment of the present invention.

  As shown in FIG. 1, in the steel strip continuous processing line 1 in this embodiment, a steel strip continuous processing device 3 that performs continuous processing while transporting the steel strip 5, and an entrance to the steel strip continuous processing device 3. A side facility 2 and a delivery side facility 4 from the steel strip continuous processing device 3 are provided.

  And the entrance side equipment 2 is arrange | positioned at the exit side of the upper side pass line 10, the lower side pass line 20, the welding apparatus 31, and the welding apparatus 31, and pinch roll (welding apparatus) which sandwiches the steel strip 5 and is driven to rotate. Output side pinch roll) 32.

  Here, the upper pass line 10 has a pay-off reel 11 for paying out the steel strip 5 (5a), a defective portion at the tip of the steel strip 5 (5a) paid out from the pay-off reel 11, and a defect at the tail end. A cutting device 15 that cuts and removes a portion, a pinch roll (pay-off reel outlet pinch roll) 12 that is disposed on the outlet side of the pay-off reel 11 and is driven to rotate by sandwiching the steel strip 5 (5a); A pinch roll (intermediate position pinch roll) 13 that is disposed at an intermediate position of the cutting device 15 and rotates and sandwiches the steel strip 5 (5a), and a steel strip 5 (5a) that is disposed on the entry side of the cutting device 15 is provided. A pinch roll 14 that is sandwiched and rotationally driven (cutting device entry side pinch roll) 14 and a pinch roll that is disposed between the cutting device 15 and the welding device 31 and rotationally drives by sandwiching the steel strip 5 (5a). A cutting device, welding device between the pinch rolls) 16 is installed.

  Further, the lower pass line 20 has a payoff reel 21 for paying out the steel strip 5 (5b), and a defective portion at the tip and a tail end of the steel strip 5 (5b) paid out from the payoff reel 21. A cutting device 25 that cuts and removes a portion, a pinch roll (pay-off reel outlet pinch roll) 22 that is arranged on the outlet side of the payoff reel 21 and that rotates by sandwiching the steel strip 5 (5b); A pinch roll (cutting device input side pinch roll) 24 that is disposed on the entry side and rotates and sandwiches the steel strip 5 (5b), and a steel strip 5 (5b) disposed between the cutting device 25 and the welding device 31. A pinch roll (pinch roll between the cutting device and the welding device) 26 that is rotationally driven with a pinch interposed therebetween is installed.

  The movement of each of the pinch rolls 12, 13, 14, 16, 22, 24, 26, and 32 is controlled by a pinch roll control device (not shown).

On the other hand, the exit side equipment 4 includes a bridle roll 33, and the transport speed of the steel strip 5 is controlled by the bridle roll 33. In the steel strip continuous processing line 1 configured as described above, the upper pass line 10 The payoff reel 11 and the payoff reel 21 of the lower pass line 20 are alternately paid out of the steel strip 5 so that the payout of the steel strip 5 is not interrupted.

  That is, for example, when the payout of the steel strip (preceding steel strip) 5a from the payoff reel 11 of the upper pass line 10 is completed, the tip of the next steel strip (following steel strip) 5b from the payoff reel 21 of the lower pass line 20 is completed. After that, the tip end of the steel strip 5b and the tail end of the preceding steel strip 5a are welded by the welding device 31, and the steel strip 5 is continuously discharged. Specifically, the cutting portion 15 cuts and removes the defective portion of the tail end portion of the preceding steel strip 5a, and the cutting portion 25 cuts the defective portion of the leading end portion of the succeeding steel strip 5b. The tail end of the steel strip 5a and the tip of the succeeding steel strip 5b are welded by the welding device 31.

  Similarly, when the payout of the steel strip 5 is completed by the payoff reel 21 of the lower pass line 20, the tip of the next steel strip 5 is paid out from the payoff reel 11 of the upper passline 10, and the payout of the steel strip 5 is continued.

  In addition, in this embodiment, for example, the tail end of the steel strip (preceding steel strip) 5 a paid out from the payoff reel 11 of the upper pass line 10 and the payoff reel 21 of the lower pass line 20 are paid out. When welding the tip of the next steel strip (following steel strip) 5b by the welding device 31, the preceding steel strip 5a decelerates the payout reel 11 from the tail end of the steel strip and reduces the conveying speed Vs. When starting, the leading steel strip 5a is sandwiched between the cutting device / welding device pinch roll 16 and the welding device outlet side pinch roll 32, which have been open until then, and the tail end of the preceding steel strip 5a and the trailing steel strip During the conveyance until the tip of 5b is welded by the welding device 31, the circumferential speed Vr of the welding device outlet side pinch roll 32 is made slower than the conveyance speed of the preceding steel strip 5a (the circumferential speed of the bridle roll 33) Vs. The peripheral speed Vq of the cutting device, welding device between the pinch rolls 16 so that slower than the peripheral speed Vr of the welding device outlet side pinch roll 32. That is, Vs> Vr> Vq. More specifically, for example, the speed difference (Vs−Vr) / Vs = 3 to 7% and the speed difference (Vr−Vq) / Vr = 3 to 7%.

  Thereby, during conveyance until the tail end of the preceding steel strip 5a is welded to the tip of the succeeding steel strip 5b by the welding device 31, the preceding steel strip 5a between the bridle roll 33 and the welding device output side pinch roll 32. In addition, tension is also generated in the preceding steel strip 5a between the welding machine outlet pinch roll 32 and the cutting device / welding device pinch roll 16, so that the tail end of the leading steel strip 5a is meandered. It can be prevented appropriately.

  FIG. 3 schematically shows the procedure described above. The conveying speed Vs of the preceding steel strip 5a, the peripheral speed Vr of the welding device outlet side pinch roll 32, and the cutting device / welding device pinch roll 16 are shown in FIG. It is a schematic diagram which shows the time transition of the circumferential speed Vq.

  That is, in FIG. 3, the following time transition is followed.

  (Time A) The preceding steel strip 5a starts to decelerate the conveyance speed Vs in advance of paying off the tail end of the steel strip 5a from the payoff reel 11.

  (Time B) The preceding steel strip 5a is sandwiched between the cutting device / welding device pinch roll 16 and the welding device outlet side pinch roll 32. Then, the peripheral speed Vr of the welding device outlet side pinch roll 32 is made slower than the conveying speed Vs of the preceding steel strip 5a, and the peripheral speed Vq of the cutting device / welding device pinch roll 16 is set to the peripheral speed of the welding device outlet side pinch roll 32. Lower than the speed Vr (Vs> Vr> Vq).

  (Time C) The tail end of the preceding steel strip 5 a is paid out from the payoff reel 11.

  (Time D) The tail end of the preceding steel strip 5a arrives at the cutting device 15 and temporarily stops the conveyance (Vs = 0, Vr = 0, Vq = 0).

  (Time E) A defective portion of the tail end portion of the preceding steel strip 5a is cut and removed by the cutting device 15 to form a new tail end.

  (Time F) The conveyance of the preceding steel strip 5a is resumed (Vs> Vr> Vq).

  (Time G) The tail end of the preceding steel strip 5a passes through the pinch roll 16 between the cutting device and the welding device.

  (Time H) The tail end of the preceding steel strip 5a arrives at the welding apparatus 31, and the conveyance is temporarily stopped (Vs = 0, Vr = 0).

  (Time I) The tail end of the preceding steel strip 5a is welded to the tip of the trailing steel strip 5b by the welding device 31.

  (Time J) The welding apparatus outlet side pinch roll 32 is opened.

  (Time K) The conveyance of the preceding steel strip 5a + following steel strip 5b is started.

  In the above, the tail end portion of the preceding steel strip 5a is further sandwiched between the intermediate position pinch rolls 13 arranged at the intermediate position between the payoff reel 11 and the cutting device 15, and the peripheral speed Vp of the intermediate position pinch roll 13 is set to It may be made slower than the peripheral speed Vq of the pinch roll 16 between the cutting device and the welding device (Vq> Vp). For example, the speed difference (Vq−Vp) / Vq = 3 to 7%.

  As a result, tension is generated also in the preceding steel strip 5a between the intermediate position pinch roll 13 and the pinch roll 16 between the cutting device and the welding device, and the tail end of the preceding steel strip 5a is more appropriately prevented. be able to.

  Moreover, it is preferable that each pinch roll 13,16,32 used in the above is a pinch roll which the roll width center part became convex shape as shown in FIG. Incidentally, FIG. 2A shows a pinch roll 41 having an elliptical roll ridgeline, FIG. 2B shows a pinch roll 42 having a trapezoidal roll ridgeline, and FIG. 2C shows a central portion of the roll ridgeline. A trapezoidal pinch roll 43, FIG. 2 (d) shows a pinch roll 44 having a convex roll ridgeline.

  In this way, meandering due to the ear extension of the steel strip 5 can be prevented by using the pinch rolls 41 to 44 having a convex roll width central portion.

  That is, the maximum tension in the width direction can be applied to the center portion in the width direction of the steel strip 5 by applying the maximum reduction to the center portion in the width direction of the steel strip 5 by the pinch rolls 41 to 44. Even when the shape of 5 is not uniform, the tension balance in the width direction of the steel strip 5 can be kept uniform.

  In the above description, the case where the payout of the steel strip 5 from the payoff reel 11 of the upper pass line 10 is completed and the next steel strip 5 is paid out from the payoff reel 21 of the lower passline 20 has been described. When the payout of the steel strip 5 from the payoff reel 21 of the pass line 20 is completed and the next steel strip 5 is paid out from the payoff reel 11 of the upper passline 10, the same operation as described above may be performed.

  As Example 1 of this invention, the continuous treatment of the steel strip was performed in the steel strip continuous processing line 1 shown in FIG.

  At that time, as an example of the present invention, the steel strip was prevented from meandering based on the above-described embodiment of the present invention. That is, for example, the tail end of the steel strip (preceding steel strip) 5 a paid out from the payoff reel 11 of the upper pass line 10 and the next steel strip (following) paid out from the payoff reel 21 of the lower pass line 20. When the front end of the steel strip 5b is welded by the welding device 31, the preceding steel strip 5a is sandwiched between the cutting device / welding device pinch roll 16 and the welding device outlet side pinch roll 32, and the tail end of the preceding steel strip 5a is During conveyance until the tip of the subsequent steel strip 5b is welded by the welding device 31, the peripheral speed Vr of the welding device outlet side pinch roll 32 is determined from the transport speed of the preceding steel strip 5a (peripheral speed of the bridle roll 33) Vs. At the same time, the peripheral speed Vq of the pinch roll 16 between the cutting device and the welding device was made slower than the peripheral speed Vr of the welding device outlet side pinch roll 32.

  On the other hand, as a comparative example, the steel strip was prevented from meandering based on the technique described in Patent Document 1. That is, for example, the tail end of the steel strip (preceding steel strip) 5 a paid out from the payoff reel 11 of the upper pass line 10 and the next steel strip (following) paid out from the payoff reel 21 of the lower pass line 20. When the front end of the steel strip 5b is welded by the welding device 31, the preceding steel strip 5a is sandwiched only by the welding device outlet side pinch roll 32, the brake is applied by the welding device outlet side pinch roll 32, and back in the line. Tension was applied.

  FIG. 4 compares the meandering amount when the tail end of the preceding steel strip arrives at the welding apparatus 31 in the present invention example and the comparative example. As shown in FIG. 4, the meandering amount of the steel strip is greatly reduced in the inventive example as compared with the comparative example.

  This confirmed the effectiveness of the present invention.

DESCRIPTION OF SYMBOLS 1 Steel strip continuous processing line 2 Entrance side equipment 3 Steel strip continuous processing apparatus 4 Outlet side equipment 5 Steel strip 5a Leading steel strip 5b Trailing steel strip 10 Upper pass line 11 Payoff reel 12 Payoff reel outlet pinch roll 13 Intermediate position pinch Roll 14 Cutting device entry side pinch roll 15 Cutting device 16 Pinch roll between cutting device and welding device 20 Lower pass line 21 Payoff reel 22 Payoff reel exit side pinch roll 24 Cutting device entry side pinch roll 25 Cutting device 26 Cutting device / welding Inter-device pinch roll 31 Welding device 32 Welding device exit side pinch roll 33 Bridle roll 41 Pinch roll in which roll ridgeline is elliptical shape 42 Pinch roll in which roll ridgeline is trapezoidal shape 43 Center part of roll ridgeline is trapezoidal shape Pinch roll 44 Roll ridge line is convex Pinch roll

Claims (4)

In a steel strip continuous processing line equipped with a steel strip continuous processing device that continuously processes steel strips while being transported, a plurality of payoffs for alternately feeding steel strips as an entry side facility to the steel strip continuous processing device A reel, a cutting device that cuts and removes the defective portion of the tip end portion and the defective portion of the tail end portion that are alternately paid out from the plurality of payoff reels, and the cutting device that is paid out from one payoff reel Subsequent steel after the defective portion at the tail end is cut and removed from the tail end of the preceding steel strip and the other payoff reel, and the defective portion at the tip is cut and removed by the cutting device. a welding device for welding the tip of the band, the cutting device and the welding and the first Pinchiro Le for rotating sandwich the strip is arranged between the device, the arranged outlet side of the welding apparatus the strip the to sandwiched by rotating the 2 If you have a Nchiro Le,
Before tail edge of preceding steel strip are paid out from the pay-off reel, sandwiching different positions of the preceding steel strip by the second Pinchiro Le and the first pinch rolls, the tail end of the preceding steel strip and the leading end of the trailing steel strip During the conveyance until welding by the welding device, the circumferential speed of the second pinch roll is made slower than the conveyance speed of the preceding steel strip, and the circumferential speed of the first pinch roll is made to be the circumferential speed of the second pinch roll. A method for preventing meandering of a steel strip, characterized by being made slower. 2. The method for preventing meandering of a steel strip according to claim 1, wherein the first pinch roll and the second pinch roll are pinch rolls having a convex center shape in the roll width. In a steel strip continuous processing line equipped with a steel strip continuous processing device that continuously processes steel strips while being transported, a plurality of payoffs for alternately feeding steel strips as an entry side facility to the steel strip continuous processing device A reel, a cutting device that cuts and removes the defective portion of the tip end portion and the defective portion of the tail end portion that are alternately paid out from the plurality of payoff reels, and the cutting device that is paid out from one payoff reel Subsequent steel after the defective portion at the tail end is cut and removed from the tail end of the preceding steel strip and the other payoff reel, and the defective portion at the tip is cut and removed by the cutting device. a welding device for welding the tip of the band, the cutting device and the welding and the first Pinchiro Le for rotating sandwich the strip is arranged between the device, the arranged outlet side of the welding apparatus the strip the to sandwiched by rotating the 2 Has a Nchiro Le, and a pinch roll control device for controlling the movement of the first pinch roll and the second pinch roll,
The pinch roll controller, before the tail edge of preceding steel strip are paid out from the pay-off reel, sandwiching different positions of the preceding steel strip by the second Pinchiro Le and the first pinch rolls, the tail end of the preceding steel strip During the conveyance until the tip of the subsequent steel strip is welded by the welding device, the peripheral speed of the second pinch roll is made slower than the transport speed of the preceding steel strip and the peripheral speed of the first pinch roll is An apparatus for preventing meandering of a steel strip, characterized in that it is slower than the peripheral speed of the second pinch roll. The meandering prevention device for a steel strip according to claim 3, wherein the first pinch roll and the second pinch roll are pinch rolls having a convex central portion in the roll width.

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