JP4808639B2 - How to make a preceding steel strip loop during welding of a continuous strip treatment facility - Google Patents

Description

The present invention relates to a steel strip when welding and joining the rear end of a preceding steel strip and the front end of a subsequent steel strip on the entrance side of a continuous steel strip processing facility such as a continuous annealing line or a continuous hot dip galvanizing line. The present invention relates to a method of creating a preceding steel strip loop (sag) during welding of a continuous processing facility.

Conventionally, in a steel strip continuous processing facility, when welding and connecting the rear end of the preceding steel strip and the front end of the subsequent steel strip, the rear end of the preceding steel strip is stopped in the welding device, and the welding device After gripping the longitudinal position of the preceding steel strip in the longitudinal direction on the exit side of the steel strip with the clamp device, the rear clamp device is fixed and the front clamp device is moved toward the rear clamp device. Thus, the entire length of the preceding steel strip is reversed, and a loop of the preceding steel strip is formed on the outlet side of the welding apparatus (see, for example, Patent Document 1). Also, a deflector pinch roll is placed on the entrance side of the welding device, and a clamp device is placed on the exit side. By making it move, a loop is formed in the preceding steel strip (see, for example, Patent Document 2).

Japanese Patent Publication No. 48-29694 JP 2001-191116 A

However, in the invention described in Patent Document 1, a steel strip cleaning device is provided on the entrance side of the steel strip continuous processing facility in order to reverse the entire length of the preceding steel strip (toggling in the direction opposite to the transport direction of the preceding steel strip). When present, there is a problem that the processing liquid is taken out from the steel strip cleaning device, and tension fluctuation occurs in the preceding steel strip, causing meandering in the preceding steel strip and a heat buckle in the furnace. Furthermore, due to the reverse size, the preceding steel strip loosens in the steel strip cleaning device and comes into contact with peripheral equipment, causing flaws on the surface of the preceding steel strip, and in the worst case, the leading steel strip breaks. There is. Further, in the invention described in Patent Document 2, it is necessary to grip the stopped preceding steel strip with a clamp device, sandwich the preceding steel strip with a deflector pinch roll, and move the deflector pinch roll in the feed direction. In the method, the rear end of the preceding steel strip cannot be stopped in the welding apparatus for welding.

The present invention has been made in view of such circumstances, and suppresses fluctuations in the tension of the preceding steel strip being processed in the steel strip continuous processing facility and the removal of the processing liquid from the steel strip cleaning device, and enters the steel strip continuous processing facility. When welding the tail end of the preceding steel strip and the tip of the succeeding steel strip on the side, the preceding steel at the time of welding of the steel strip continuous processing equipment that can quickly form a loop on the rear side of the preceding steel strip An object is to provide a band loop creation method.

The preceding steel strip loop creation method for welding a continuous steel strip treatment facility according to the present invention in accordance with the above-described object includes a welding device and a first bridle from the upstream side along the steel strip transport path on the entrance side of the continuous steel strip treatment facility It has a roll, a steel strip cleaning device, a second bridle roll, and a looper device, and transports and fixes the front side of the succeeding steel strip to the standby position in the welding device while processing the preceding steel strip. A method of creating a preceding steel strip loop during welding of a continuous treatment facility for steel strip that stops feeding of the preceding steel strip and welds the rear end portion of the preceding steel strip and the front end portion of the subsequent steel strip,
In a state where the first bridle roll is driven, the preceding steel strip passing through the steel strip cleaning device and the second bridle roll is stopped, and the preceding steel strip is disposed downstream of the first bridle roll. A first step of stopping the first bridle roll after forming the first loop of the band;
The preceding steel strip is gripped and fixed by the preceding steel strip clamping means provided on the downstream side of the welding apparatus, and the first bridle roll is reversed for a short time so that part or all of the first loop is And a second step of forming a second loop between the first bridle roll and the preceding steel strip clamping means.

In the method for creating a preceding steel strip loop during welding of a steel strip continuous treatment facility according to the present invention, in the first step, the first bridle roll, the steel strip cleaning device, and the second bridle roll are passed. When the plate speed of the preceding steel strip is gradually decreased and the rear end position of the preceding steel strip reaches a preset position, the operation of the first bridle roll is maintained to It is preferable to stop the movement of the preceding steel strip passing through the steel strip pretreatment device and the second bridle roll while feeding the steel strip.

In the method for creating the preceding steel strip loop during welding of the steel strip continuous processing equipment according to claim 1 and 2, since the second loop can be formed on the rear side of the preceding steel strip without reverse dimensioning the entire preceding steel strip, It is possible to prevent the occurrence of looseness in the preceding steel strip by preventing the tension fluctuation of the preceding steel strip. As a result, it is possible to prevent meandering and heat buckles in the furnace from occurring in the preceding steel strip, and the preceding steel strip loosens in the steel strip cleaning device due to the reverse size and comes into contact with peripheral equipment on the surface of the preceding steel strip. It becomes possible to prevent wrinkles from occurring. In addition, since the preceding steel strip is not reversed in the electrolytic cleaner of the steel strip cleaning device, it is possible to prevent contact damage to the electrodes in the electrolytic cleaner and to prevent the processing liquid from being taken out from the steel strip cleaning device.

In particular, in the welding method of the steel strip continuous processing facility according to claim 2, the first loop is formed during the stop operation of the preceding steel strip necessary for welding with the succeeding steel strip, Since the second loop necessary for alignment of the preceding steel strip is formed using the loop, the second loop can be formed quickly.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
Here, FIG. 1 is an explanatory diagram of a steel strip continuous treatment facility to which a method for creating a preceding steel strip loop during welding of a steel strip continuous treatment facility according to an embodiment of the present invention is applied, and FIG. Explanatory drawing which shows the movement condition of a preceding steel strip by the welding preceding steel strip loop creation method of a continuous strip treatment facility, (B) is an explanation showing a state where a first loop is formed on the downstream side of the first bridle roll. FIG. 3C is an explanatory diagram showing a state in which the first bridle roll is reversed and a second loop is formed between the first bridle roll and the preceding steel strip clamping means, and FIG. 3 is the first bridle. It is explanatory drawing which shows the time change of the plate | board speed of the preceding steel strip which passes a roll, a steel strip cleaning apparatus, and a 2nd bridle roll.

As shown in FIG. 1, a steel strip continuous treatment facility 10 to which a method for creating a preceding steel strip loop during welding of a steel strip continuous treatment facility according to an embodiment of the present invention is applied to a steel strip transport path 11 on the entry side. , A welding device 12, a first bridle roll 13, a steel strip cleaning device 14, a second bridle roll 15, and a looper device 16 are provided from the upstream side. This will be described in detail below.

As the welding device 12, a conventionally used welding device can be used. For example, the front side position of the rear end portion of the preceding steel strip 17 stopped in the welding device 12 is grasped and preceded at the time of welding. A preceding steel strip clamp (not shown) for adjusting the position of the steel strip 17 and the rear side of the leading end of the subsequent steel strip 18 conveyed to the standby position in the welding apparatus 12 are gripped at the time of welding. The welding steel strip clamp 19 (see FIG. 2) for adjusting the position of the steel strip 18, the rear end of the preceding steel strip 17 held and fixed by the welding steel strip clamp, and the welding steel strip Adjusting the position by operating a cutting blade (not shown) that cuts and removes the tip of the trailing steel strip 18 held and fixed by the clamp 19, a preceding steel strip clamp for welding, and a preceding steel strip clamp for welding Welding electrodes (not shown) for welding the connected preceding and following steel strips 17 and 18 together It is equipped with a. When the rear end of the preceding steel strip 17 and the leading end of the succeeding steel strip 18 are connected and the processing of the preceding steel strip 17 is completed, the processing of the subsequent steel strip 18 can be started subsequently.

Further, on the downstream side of the welding device 12, a preceding steel strip clamping means 20 for holding and fixing the preceding steel strip 17 whose rear end portion is stopped in the welding device 12 is provided. Here, the preceding steel strip clamp means 20 has first and second preceding steel strip clamps 21 and 22 for gripping positions at two different positions in the longitudinal direction of the preceding steel strip 17. The preceding steel strip clamps 21 and 22 are independently connected to a drive source (not shown) that is moved in the width direction of the steel strip transport path 11. And a drive source is an edge part position detector (not shown) which detects the width direction edge part position of the preceding steel strip 17 in two different positions between the 1st, 2nd preceding steel strip clamps 21 and 22. The first and second preceding steel strip clamps 21 and 22 are moved on the basis of the output signal from).

Further, a downstream steel strip clamp means 23 is provided on the upstream side of the welding device 12 to grip and fix the subsequent steel strip 18 conveyed to the standby position in the welding device 12. Here, the trailing steel strip clamp means 23 includes first and second trailing steel strip clamps 24 and 25 for gripping two different positions in the longitudinal direction of the trailing steel strip 18. The second trailing steel strip clamps 24 and 25 are independently connected to a driving source (not shown) that is moved in the width direction of the steel strip conveying path 11. The drive source is an end position detector that detects the position in the width direction of the trailing steel strip 18 at two different positions between the first and second trailing steel strip clamps 24, 25 (see FIG. The first and second trailing steel strip clamps 24 and 25 are moved on the basis of an output signal from (not shown).

Accordingly, the preceding steel strip clamping means 20 moves the rear end of the preceding steel strip 17 in the steel strip conveying path 11 so that the rear side of the preceding steel strip 17 is parallel to the center of the steel strip conveying path 11. Can be aligned. Further, the trailing steel strip clamping means 23 moves the tip of the trailing steel strip 18 in the steel strip conveying path 11 so that the front side of the trailing steel strip 18 is parallel to the center of the steel strip conveying path 11. Can be aligned. The rear end side of the preceding steel strip 17 is gripped by the preceding steel strip clamp for welding in the welding device 12, and the front end side of the subsequent steel strip 18 is gripped by the trailing steel strip clamp 19 for welding in the welding device 12. Then, the holding of the preceding steel strip 17 by the preceding steel strip clamping means 20 is released, the holding of the trailing steel strip 18 by the following steel strip clamping means 23 is released, and the rear end of the preceding steel strip 17 is used as the trailing steel strip. 18, and the rear end center position of the preceding steel strip 17 is matched with the center position of the steel strip transport path 11.

The steel strip cleaning device 14 has an action of removing dirt adhering to the surface of the preceding steel strip 17 and smoothing the surface. For example, an alkaline liquid is stored from the upstream side to which the preceding steel strip 17 is supplied. An alkaline immersion tank 26 that passes through the preceding steel strip 17 to remove oil and fat adhering to the surface, and a roller that squeezes out the alkaline liquid adhering to the surface of the preceding steel strip 17 that has passed through the alkaline immersion tank 26 And an alkaline solution removing mechanism 28 having a group 27.

Further, the steel strip cleaning device 14 includes an electrolytic cleaning tank 29 for passing the preceding steel strip 17 from which the alkaline solution has been removed from the surface between the electrodes filled with the electrolytic cleaning solution to smooth the surface, and an electrolytic cleaning tank. And an electrolytic cleaning liquid removing mechanism 31 including a roller group 30 that squeezes the electrolytic cleaning liquid adhering to the surface of the preceding steel strip 17 that has passed through 29. Further, the steel strip cleaning device 14 has a cleaning tank 32 that passes the preceding steel strip 17 that has passed through the electrolytic cleaning liquid removing mechanism 31 through the cleaning liquid and rinses the electrolytic cleaning liquid remaining on the surface thereof. Have.
And the preceding steel strip 17 which passed the washing tank 32 is supplied to the 2nd bridle roll 15 provided with the drive source (not shown) by the conveyance direction being changed by the deflection rolls 33 and 34, and the 2nd The preceding steel strip 17 fed out from the bridle roll 15 is supplied again into the looper device 16 with its conveying direction changed again by the deflection roll 35.

The looper device 16 hangs the deflection roll 36 that changes the conveying direction of the preceding steel strip 17 sent out from the second bridle roll 15 and the preceding steel strip 17 that has passed through the deflection roll 36 in, for example, the vertical direction. A plurality of steel strip storage portions 39 including a pair of upper and lower roller groups 37 and 38 that are allowed to pass while forming a plurality of loops are provided. Further, the looper device 16 is provided between the steel strip storage part 39 and sends out the preceding steel strip 17 and the preceding steel strip 17 that has passed through the last steel strip storage part 39 is sent downstream. Does not have a discharge part. Here, the roller group 37 disposed on the upper side is configured to be movable up and down, and by raising and lowering the roller group 37, the loop length of the preceding steel strip 17 spanned in the vertical direction can be adjusted.

Therefore, by adjusting the position of each roller group 37 in the looper device 16, it is possible to discharge while storing a certain amount of the preceding steel strip 17 flowing into the looper device 16. For this reason, even if the inflow of the preceding steel strip 17 to the looper device 16 stops, the preceding steel strip 17 stored in the looper device 16 can be discharged by lowering the roller group 37. As a result, even when the inflow of the preceding steel strip 17 to the looper device 16 is stopped, the preceding steel strip 17 can be discharged from the looper device 16 and the processing of the preceding steel strip 17 can be performed continuously.

The first bridle rolls 13 are arranged side by side, are rotated by rotational power from a drive source, and rotate in contact with the preceding steel strip 17, respectively, and first and second cylindrical rotating bodies 41 and 42, and first and second And the snubber roll 43 that presses the preceding steel strip 17 in contact with the cylindrical rotating bodies 41 and 42 from the outside. Thereby, the preceding steel strip 17 can be fed into the steel strip cleaning device 14 by rotating the first and second cylindrical rotating bodies 41 and 42. The second bridle rolls 15 are also arranged side by side, and rotate by rotational power from the drive source, respectively, and contact the preceding steel strip 17 to be in contact with the preceding steel strip 17, first, second, It has a snubber roll 46 that presses the preceding steel strip 17 in contact with the second cylindrical rotating bodies 44 and 45 from the outside. Accordingly, the preceding steel strip 17 can be fed into the looper device 16 by rotating the first and second cylindrical rotating bodies 44 and 45.

Then, the preceding steel strip loop creation method at the time of welding of the steel strip continuous processing equipment concerning one embodiment of the present invention is explained.
As shown in FIG. 2 (A), for example, in a steady state in which the preceding steel strip 17 supplied from a steel strip supply device (not shown) is continuously processed by the steel strip continuous processing facility 10, the preceding steel strip 17 is It passes through the welding device 12, is sent out by the rotation of the first and second cylindrical rotating bodies 41 and 42 provided on the first bridle roll 13, and is supplied into the steel strip cleaning device 14. At this time, as shown in FIG. 3, the plate passing speeds of the preceding steel strip 17 passing through the first bridle roll 13, the steel strip cleaning device 14, and the second bridle roll 15 are substantially the same (for example, 200 to 500 m / min).

Here, the subsequent steel strip 18 to be processed next to the preceding steel strip 17 is a steel strip provided by a steel strip supply device (not shown) provided in parallel with the steel strip supply device that supplied the preceding steel strip 17. It is paid out into the conveying path 11 and the leading end of the trailing steel strip 18 is conveyed to a standby position in the welding apparatus 12. Next, two different positions in the longitudinal direction of the succeeding steel strip 18 are gripped by the first and second succeeding steel strip clamps 24 and 25 of the succeeding steel strip clamp means 23 provided on the upstream side of the welding device 12. Is done. Then, the end position detector detects the width direction end position of the trailing steel strip 18 at two different positions between the first and second trailing steel strip clamps 24, 25, and outputs an output signal thereof. The first and second trailing steel strip clamps 24 and 25 are moved in the width direction of the steel strip conveying path 11 by operating the drive source based on the above, and the leading end of the trailing steel strip 18 is moved to the steel strip conveying path 11. Is adjusted so that the front side of the trailing steel strip 18 is aligned with the center of the steel strip conveying path 11.

When the processing of the preceding steel strip 17 proceeds and, for example, the length from the center position of the welding device 12 to the rear end of the preceding steel strip 17 reaches a preset length, as shown in FIG. The plate passing speed of the preceding steel strip 17 passing through the first bridle roll 13, the steel strip cleaning device 14, and the second bridle roll 15 is decreased at a constant deceleration (step 1A above). Then, when the movement position of the preceding steel strip 17 reaches a preset movement position (the rear end of the preceding steel strip 17 is 400 to 600 mm upstream from the center of the welding apparatus), the operation of the first bridle roll 13 is maintained. Then, the preceding steel strip 17 is sent out for a short time, and the movement of the preceding steel strip 17 passing through the steel strip pretreatment device 14 and the second bridle roll 15 is stopped. Thereby, the first loop 47 of the preceding steel strip 17 is formed on the downstream side of the first bridle roll 13. After the formation of the first loop 47, the first bridle roll 13 is stopped, and the rear end of the preceding steel strip 17 is stopped in the welding device 12 (the 1B step, the 1A step and the 1B). The first step is composed of steps). Here, the length of the first loop 47 is, for example, 400 to 600 mm.

When the tail end of the preceding steel strip 17 stops in the welding device 12, as shown in FIG. 2C, the first and second of the preceding steel strip clamping means 20 provided on the downstream side of the welding device 12. The preceding steel strip clamps 21 and 22 hold the positions of two different locations in the longitudinal direction of the preceding steel strip 17. Then, the first bridle roll 13 is reversed and stopped for a short time, and a part or all of the first loop 47 is moved to the first bridle roll 13 and the first preceding steel band clamp 21 of the preceding steel band clamping means 20. To form a second loop 48 (the second step).
Here, on the downstream side of the first preceding steel strip clamp 21, a lifting means 51 having a contact roller 49 that contacts the lower surface of the preceding steel strip 17 and an arm member 50 that pushes the contact roller 49 upward. By providing and pushing up the contact roller 49 in synchronization with the reverse rotation of the first bridle roll 13, the second loop 48 can be formed immediately downstream of the first preceding steel strip clamp 21.

Next, the end position detector detects the width direction end position of the preceding steel strip 17 at two different positions between the first and second preceding steel strip clamps 21 and 22, and based on the output signal. Then, the drive source is operated to move the first and second preceding steel strip clamps 21 and 22 in the width direction of the steel strip conveying path 11 respectively. At this time, since the second loop 48 is formed in the preceding steel strip 17, the rear end of the preceding steel strip 17 can be easily moved in the steel strip conveying path 11. The side can be aligned so as to be parallel to the center of the steel strip conveyance path 11.

Next, the trailing steel strip 18 is aligned so that the front side of the trailing steel strip 18 is parallel to the center of the steel strip conveying path 11, so that the center position of the tip is positioned behind the preceding steel strip 17. The rear end of the preceding steel strip 17 is made to coincide with the front end of the subsequent steel strip 18 so as to coincide with the end center position. For example, the rear end side of the preceding steel strip 17 is gripped by the preceding steel strip clamp for welding, the front end side of the trailing steel strip 18 is gripped by the subsequent steel strip clamp 19 for welding, and the leading steel strip clamping means 20 performs the leading end. In a state where the gripping of the steel strip 17 and the gripping of the trailing steel strip 18 by the trailing steel strip clamping means 23 are released, and the rear end side of the preceding steel strip 17 is gripped and lifted by the preceding steel strip clamp for welding. The leading end side of the trailing steel strip 18 is grasped by the trailing steel strip clamp 19 for welding and pulled out to the rear end side of the preceding steel strip 17, and the leading end center position of the trailing steel strip 18 is set to the rear end center of the leading steel strip 17. By matching the positions, the rear end portion of the preceding steel strip 17 can be overlapped with the front side of the following steel strip 18, and the rear end portion of the preceding steel strip 17 and the front end portion of the following steel strip 18 are welded. Can be connected.

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above-described embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included.
For example, the first bridle roll is used to feed the preceding steel strip to the steel strip cleaning device, but a pinch roll can be used instead of the first bridle roll.

It is explanatory drawing of the steel strip continuous processing equipment to which the steel strip continuous processing equipment at the time of welding of the steel strip continuous processing equipment concerning one embodiment of the present invention is applied. (A) is explanatory drawing which shows the movement condition of a preceding steel strip by the welding preceding steel strip loop creation method of the steel strip continuous processing equipment, and (B) is a first loop formed on the downstream side of the first bridle roll. (C) is an explanatory view showing a state in which the first bridle roll is reversed and a second loop is formed between the first bridle roll and the preceding steel strip clamping means. . It is explanatory drawing which shows the time change of the plate | board speed of the preceding steel strip which passes a 1st bridle roll, a steel strip cleaning apparatus, and a 2nd bridle roll.

Explanation of symbols

10: Steel strip continuous treatment equipment, 11: Steel strip transport path, 12: Welding device, 13: First bridle roll, 14: Steel strip cleaning device, 15: Second bridle roll, 16: Looper device, 17: Preceding steel strip, 18: trailing steel strip, 19: trailing steel strip clamp for welding, 20: preceding steel strip clamp means, 21: first leading strip clamp, 22: second leading strip clamp, 23 : Trailing steel strip clamp means, 24: first trailing steel strip clamp, 25: second trailing steel strip clamp, 26: alkali immersion tank, 27: roller group, 28: alkaline liquid removal mechanism, 29: Electrolytic cleaning tank, 30: Roller group, 31: Electrolytic cleaning liquid removal mechanism, 32: Cleaning tank, 33, 34, 35, 36: Deflection roll, 37, 38: Roller group, 39: Steel strip reservoir, 40: Drive roller mechanism, 41: first Cylindrical rotating body, 42: second cylindrical rotating body, 43: snubber roll, 44: first cylindrical rotating body, 45: second cylindrical rotating body, 46: snubber roll, 47: first loop, 48: second loop, 49: contact roller, 50: arm member, 51: lifting means

Claims (2)

It has a welding device, a first bridle roll, a steel strip cleaning device, a second bridle roll, and a looper device from the upstream side along the steel strip conveyance path on the entrance side of the steel strip continuous treatment facility. The front side of the succeeding steel strip is transported and fixed to the standby position in the welding apparatus while performing the processing, the feed of the preceding steel strip is stopped, and the rear end portion of the preceding steel strip and the succeeding steel A method of creating a preceding steel strip loop at the time of welding of a steel strip continuous processing equipment for welding the tip of the strip,
In a state where the first bridle roll is driven, the preceding steel strip passing through the steel strip cleaning device and the second bridle roll is stopped, and the preceding steel strip is disposed downstream of the first bridle roll. A first step of stopping the first bridle roll after forming the first loop of the band;
The preceding steel strip is gripped and fixed by the preceding steel strip clamping means provided on the downstream side of the welding apparatus, and the first bridle roll is reversed for a short time so that part or all of the first loop is A method of creating a preceding steel strip loop during welding of a steel strip continuous processing facility, comprising: a second step of forming a second loop between a first bridle roll and the preceding steel strip clamping means. 2. The method for creating a preceding steel strip loop during welding of a steel strip continuous treatment facility according to claim 1, wherein in the first step, the first bridle roll, the steel strip cleaning device, and the second bridle roll are passed. Gradually lowering the plate passing speed of the preceding steel strip, and when the rear end position of the preceding steel strip reaches a preset position, the operation of the first bridle roll is maintained and the preceding steel strip is maintained. , And the movement of the preceding steel strip passing through the steel strip pretreatment device and the second bridle roll is stopped.

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