JPH08197138A - Controller for meandering of metallic strip - Google Patents

Abstract

PURPOSE: To provide a controller which is capable of correcting the meandering of a metallic strip even in a state where tension is not imparted. CONSTITUTION: The meandering controller 20 is constituted of a detecting means 29 for detecting the meandering quantity of a transported metallic strip, control means 37, bridle roll 30, snubber roll 32 and tilting means 36 provided in the snubber roll. In a state where no tension is imparted to the metallic strip 28, the detecting means 29 detects the meandering quantity of the strip 28 and, in response to that output, the control means 37 calculates the tilting quantity, which is the quantity to be controlled, and outputs it to the tilting means 36. In response to that output, the tilting means 36 tilts the axial line of the snubber roll 32, in a horizontal plane including that axial line, against a perpendicular plane including the axial line of the bridle roll 30. Thus, a meandering correcting force is imparted to the metallic strip 28.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a meandering control device for metal strips provided on the entrance side of a process line.

[0002]

2. Description of the Related Art Generally, in a process line such as a hot dip coating line and an electroplating line, metal strips are sequentially welded at the line entrance side, and then continuously conveyed to a subsequent processing device for processing. When the metal strip is continuously conveyed, meandering of the metal strip may occur due to various causes such as a decrease in tension of the metal strip. Since the meandering of the metal band mainly causes a positional deviation in the plate width direction, after various treatments, when winding the metal band on the take-up reel at the exit side, there is a problem that the end of the metal band becomes uneven. Occurs. The following prior art is disclosed as a meandering control device for preventing such meandering.

FIG. 10 is a plan view showing a simplified structure of the meandering control device disclosed as the prior art.
The meandering control device 9 is provided on both ends of the steering roll 10 for correcting the meandering by contacting the metal strip 12 being conveyed, and a cylinder for imparting a swing angle θ to the steering roll 10 in a horizontal plane. 11, a meandering amount detection device 13, and a swing angle calculation device 14
It has and. The swing angle θ is a tilt angle when the axis of the steering roll 10 is tilted by an angle θ from a reference state that is perpendicular to the transport direction of the metal strip 12 in the horizontal plane. Since the meandering correction amount changes depending on the magnitude of the swing angle θ, the swing angle θ is represented as a function of the meandering correction amount. Therefore, when the meandering amount detecting device 13 detects the meandering amount of the metal strip 12, the swing angle computing device 1
The swing angle θ at which the meandering amount is zero is calculated by 4, and the swing angle θ is given to the steering roll 10 by the cylinder 11, and the meandering of the metal strip 12 is corrected.

[0004]

The meandering control device 9 of the prior art has a good meandering control characteristic when the metal strip 12 is tensioned. However,
There is a problem that the effect of correcting the meandering is hardly recognized when the metal band 12 is not tensioned. Further, in the above process line, when the tail end of the preceding metal strip is cut and then conveyed to the welding machine, the tension at the tail end of the metal strip becomes zero, so that the metal strip meanders on the upstream side of the bridle roll. There is. When welding is performed in such a meandering state, as shown in FIG. 11, for example,
The leading metal strip 16 and the trailing metal strip 17 form a dogleg shape in the welded portion 18, that is, a so-called dogleg weld, or as shown in FIG. , 17 are displaced and become uneven, so-called step welding. When the welded portions 18 and 19 shown in FIG. 11 or FIG. 12 are formed, a large tensile stress is locally generated in the welded portions 18 and 19 due to the influence of the tension in the process line, and the welded portions 18 and 19 are There is a risk of breaking at 19.

It is an object of the present invention to provide a meandering control device for a metal strip which is capable of correcting meandering even when no tension is applied to the entrance side of the process line.

[0006]

SUMMARY OF THE INVENTION The present invention is a payoff reel for supplying a metal strip coil, a shearing means for shearing the metal strip, a welding means for welding the metal strip, and a bridle roll for applying tension to the metal strip. In a meandering control device for a process line configured by arranging and in this order, a meandering amount detecting means provided between the welding means and the bridle roll to detect the meandering amount of the conveyed metal strip, and the bridle roll. A pressing roll that presses the metal strip to the helix, tilting means that tilts the axis of the pressing roll with respect to a plane including the axis of the bridle roll, and tilts the axis of the pressing roll in response to the output of the meandering amount detection means. A meandering control of a metal band, the control means driving the tilting means to control the metal band wound around the bridle roll so as not to meander. It is a device. Further, the pressing roll of the present invention is characterized in that its axis line is provided with a gap in the metal band conveyance direction with respect to the axis line of the bridle roll. Further, the tilting means of the present invention includes a bearing means for supporting one end portion in the axial direction of the pressing roll at a fixed position so as to be angularly displaceable around an axis line intersecting the axis line of the bridle roll, and the other end portion in the axial direction of the pressing roll. , And displacement adjusting means for adjusting the displacement by driving the displacement substantially in the front-rear direction.

[0007]

According to the present invention, the meandering control device for the metal strip detects the meandering amount of the metal strip by the meandering amount detecting means, and drives the tilting means for tilting the pressing roll by the control means to drive the metal strip by the bridle. The axis of the pressing roll pressed against the roll can be inclined with respect to the plane including the axis of the bridle roll according to the detected meandering amount.
As a result, the metal strip is applied with the meandering correction force through the tilting means by the control means while being sandwiched between the bridle roll and the pressing roll, so that the meandering control of the metal strip is possible even when no tension is applied. Yes, you can fix the meandering of the metal strip.

Further, according to the present invention, the pressing roll is provided such that its axis is spaced from the axis of the bridle roll in the direction of transport of the metal strip. As a result, when the pressing roll is tilted, the contact state between the pressing roll and the metal band largely changes, so that the pressing roll can apply a large meandering correction force to the metal band.

According to the invention, the tilting means causes the other end of the pressing roll to be displaced by the displacement adjusting means, and the pressing roll is tilted with the bearing means for supporting one end of the pressing roll so as to be angularly displaceable as the tilting center. Can be made. As a result, the tilting means can quickly and reliably apply the meandering correction force to the metal strip.

[0010]

1 is a block diagram showing a simplified construction of a meandering control device for a metal strip (hereinafter, referred to as a meandering control device) which is an embodiment of the present invention. FIG. 1 also shows a simplified configuration of the entrance side of the process line including the meandering control device 20. The metal strip coils 21 and 22 such as cold rolled steel strips have payoff reels 23 and 24 for each coil.
Be attached to. The preceding metal strip coil 21 is unwound from the pay-off reel 23, the tip portion thereof is sheared by the shearing means 25, and then conveyed to the downstream side for processing. The trailing metal strip coil 22 is unwound from the pay-off reel 24, the tip portion thereof is sheared by the shearing means 26, is conveyed to the welding means 27, is stopped and stands by. When the preceding metal strip coil 21 is rewound to the coil tail end portion, the tail end portion is sheared by the shearing means 25 and conveyed to the welding means 27, where the leading end portion of the trailing metal strip coil 22 which is waiting in advance. Welded with. The welded metal strip 28 includes a meandering amount detecting means 29 and an upstream bridle roll (hereinafter, abbreviated as bridle roll) 3
0, through the downstream bridle roll 31, it is conveyed to the subsequent processing equipment, for example, hot dip galvanizing equipment, and processed.

The bridle roll 30 is provided with an upstream snubber roll (hereinafter abbreviated as snubber roll) 32 which is a pressing roll. The snubber roll 32 is provided to maintain the tension on the downstream side when the tension on the upstream side of the bridle roll 30 becomes zero. The state where the tension on the upstream side of the bridle roll 30 becomes zero occurs when the tail end portion of the preceding metal strip coil 21 leaves the payoff reel 23, for example. Snubber roll 32 is a metal strip 28
2 is pressed against the bridle roll 30 and conveyed.
It follows 8 and rotates. The pressing force of the snubber roll 32 is
It is provided by the double-acting air cylinder 33. The same applies to the downstream bridle roll 31. In this embodiment, the pressing force applied to the metal strip 28 by the snubber roll 32 and the downstream snubber roll 34 is maintained at a constant value.

The meandering control device 20 includes a metal strip 2 to be conveyed.
8 meandering amount detecting means 29 for detecting the meandering amount, control means 37, bridle roll 30, snubber roll 32
And a tilting means 36 provided on the snubber roll 32. As described above, when the tail end of the preceding metal strip coil 21 leaves the payoff reel 23 and is conveyed to the welding means 27, the tension of the metal strip 28 on the upstream side of the bridle roll 30 becomes zero, so 28 may meander. In such a state, when the meandering amount of the metal strip 28 is detected by the meandering amount detecting means 29, the controlling means 37 responds to the output thereof to calculate the tilting amount of the tilting means 36 which is a control amount, Output to the tilting means 36. In response to the output, the tilting means 36 tilts the axis of the snubber roll 32 in the horizontal plane including the axis with respect to the vertical plane including the axis of the bridle roll 30. As a result, the metal strip 28 becomes the bridle roll 3
Since the pressing force distribution in the axial direction of the snubber roll 32 can be changed in the state where it is sandwiched between 0 and the snubber roll 32, the meandering correction force is applied to the metal strip 28.

FIG. 2 is a perspective view showing a simplified structure of the meandering amount detecting means in the meandering control device shown in FIG. The meandering amount detection means 29 includes a light source 43 arranged below the metal band 28, and two image sensors 41 and 42 arranged above the metal band 28 so as to face each other. Metal strip 2
8 is conveyed between the light source 43 and the image sensors 41 and 42. The image sensors 41 and 42 are arranged at both ends of the metal strip 28 in the plate width direction. If the metal strip 28 meanders in the plate width direction, the amount of light received by the image sensors 41 and 42 increases or decreases in correspondence with the meandering direction, so that the amount of meandering can be detected.

FIG. 3 is a side view showing a simplified structure near the bridle roll of the meandering control apparatus shown in FIG.
FIG. 4 is a plan view showing a simplified structure near the bridle roll shown in FIG. The metal band 28 is wound around the bridle roll 30 and the downstream bridle roll 31 and conveyed. The bridle roll 30 and the downstream bridle roll 31 are rolls coated with, for example, a high-density nonwoven fabric made of synthetic resin fiber, and the drive motors 50, 5 are provided.
Each of them is rotationally driven by 1. The axes of the bridle roll 30 and the downstream bridle roll 31 are parallel to each other and are perpendicular to the transport direction of the metal strip 28.
A snubber roll 32 is provided above the bridle roll 30.
And a swing holding table 52 for holding the same are provided so as to be able to be displaced toward and away from the bridle roll 30.

The swing holding table 52 is a frame-shaped member including a first horizontal frame 53, a second horizontal frame 54, a first vertical frame 55, and a second vertical frame 56, and is adjacent to adjacent parts. Joined and fixed,
It is formed in a substantially rectangular shape. First horizontal frame 53 and second horizontal frame 5
4 is a substantially rectangular plate-shaped member, the axis of which is a metal strip 28.
Parallel to the transport direction of. The plate surface portion of the first horizontal frame 53 is erected at a right angle to the plate surface of the metal strip 28, and its installation position is the drive motor 50 side of the bridle roll 30 in the plate width direction of the metal strip 28 ( Hereinafter, the drive side will be abbreviated). The second horizontal frame 54 is erected on the non-driving side (hereinafter abbreviated as the working side) of the metal strip 28 in the plate width direction with the first horizontal frame 53 and the plate surface portion facing each other in parallel. The first vertical frame 55 and the second vertical frame 56 are tubular members, and their axes are perpendicular to the transport direction of the metal strip 28. The first vertical frame 55 is
They are arranged in parallel with each other on the upstream side of the second vertical frame 56.

An upstream end of the second horizontal frame 54 has a mount 57.
A pin holding member 58 provided in the above is swingably pin-coupled via a pin 59. The other end of the second horizontal frame 54 is rotatably pin-connected to the double-acting air cylinder 33 via a pin 60. The configuration of the first horizontal frame 53 is similar to that of the second horizontal frame 54. The swing holding base 52 can swing and displace with the pin 59 as a fulcrum when the double-acting air cylinder 33 moves up and down, and the snubber roll 32 can be moved toward and away from the bridle roll 30 as shown by an imaginary line 89. The double-acting air cylinder 33 is rotatably pin-connected to the mount 57 via a pin 46.

A fixed base 61 is provided on the drive side of the swing holding base 52.
Is provided. One end of the fixed base 61 on the drive side is the first
It is joined and fixed to the lower end surface of the horizontal frame 53 via a rib 62, and the other end of the fixed base 61 is arranged from the first vertical frame 55 to
It is joined and fixed to the lower surface of the beam 63 that is stretched over the vertical frame 56. Further, also in the downstream side bridle roll 31, the downstream side snubber roll 34, the downstream side swing holding table 39 for holding the same, and the pins 48, 48 for the downstream side bridle roll 31, as in the bridle roll 30.
Double-acting air cylinder 3 that is moved toward and away from each other via 49
And 5 are provided. The double-acting air cylinder 35 is rotatably pin-coupled to the mount 57 via a pin 47.

The snubber roll 32 is, for example, a rubber roll, and is formed in a right column shape over the entire length of the bridle roll 30 in the axial direction. The tilting means 36
When not operating, the axis of the snubber roll 32 is parallel to the axis of the bridle roll 30, and the vertical plane including the axis of the snubber roll 32 is spaced from the vertical plane including the axis of the bridle roll 30 in the transport direction of the metal strip 28. Offset by L. The interval L is, for example, the metal strip 28.
Is 95 mm on the downstream side in the conveyance direction.

A bearing means 65 is provided at the working journal portion of the snubber roll 32. The bearing means 65 is
It includes a working-side bearing support member 69 and a self-aligning roller bearing (not shown) fitted thereto. The working journal portion of the snubber roll 32 is fitted to the self-aligning roller bearing.

The working-side bearing support member 69 is fixed to the support member mounting plate 66 with bolts and nuts, and the support member mounting plate 66 has a rib on the lower end surface of the second horizontal frame 54 of the swing holding base 52. It is joined and fixed via 67. The setting change of the offset amount is performed by changing the working side bearing support member 69.
Can be moved by the offset amount adjusting member 68. The configuration of the drive side journal portion of the snubber roll 32 is as described later.

FIG. 5 is a partial cross-sectional side view near the tilting means of the meandering control device as seen from the section line VV shown in FIG.
6 is a plan view near the tilting means of the meandering control device shown in FIG. 5, and FIG. 7 is a cross-sectional view taken along the section line VII-VII shown in FIG.

The tilting means 36 is a displacement adjusting means 39 for displacing and adjusting the axially driving side end of the snubber roll 32 forward and backward in the transport direction of the metal strip 28, and the snubber roll 3.
Snubber roll 32 at the fixed position at the end on the working side in the axial direction of 2
Bearing means 65 for supporting the snubber roll 32 such that the snubber roll 32 can be angularly displaced about the vertical axis.

The displacement adjusting means 39 includes the fixed base 61 provided on the drive side of the swing holding base 52 and the movable base 7 provided below the fixed base 61 in parallel with a space therebetween.
1 and the movable base 71 mounted on the fixed base 61 and the metal body 28.
Drive means 72 for slidably displacing in the conveying direction of the sheet, and the fixed base 6.
1 is provided between the movable table 71 and the fixed table 61 and the movable table 7
And a connecting member 73 that slidably connects 1 to each other.

The drive means 72 includes a drive motor 75, a coupling 76, and a screw jack 77. The drive motor 75 can be rotationally driven to linearly drive the screw rod 78 of the screw jack 77 through the coupling 76 in the axial direction.

The moving base 71 is rotatably connected to the free end of the screw rod 78 of the screw jack 77 via the connecting arm 79, and can be linearly displaced by the rotational drive of the drive motor 75. The linear displacement amount of the moving table 71 is 10 mm on the upstream side and the downstream side of the metal strip 28 in the transport direction.

The connecting member 73 includes a guide rail 81 and a sliding member 82 having a fitting groove, and the fitting groove is slidably fitted in the guide rail 81. Since the bottom of the fitting groove of the sliding member 82 is formed wider than the upper part, the connecting member 73 formed by fitting with the guide rail 81 can support the vertical load.

A drive-side bearing support member 85 is fixed to the lower surface of the movable table 71, and the drive-side journal portion of the snubber roll 32 is fitted to the drive-side bearing support member 85 via a self-aligning roller bearing 90. Since the raceway surface of the outer ring of the self-aligning roller bearing 90 forms a spherical surface, the self-aligning roller bearing 90 has the aligning property. Moving base 71, drive-side bearing support member 85
The load on the driving side of the snubber roll 32 is slidably supported by the connecting member 73.

Since the bearing means 65 is provided on the working side of the snubber roll 32 and configured as described above, automatic adjustment is possible even if the axis of the snubber roll 32 is inclined with respect to the vertical plane including the axis of the bridle roll 30. Center roller bearing 90
Thus, the working-side journal portion of the snubber roll 32 can be rotatably supported in the inclined state. Therefore, the bearing means 65 forms the tilt center of the snubber roll 32 and can support the snubber roll 32 so as to be angularly displaceable around the vertical axis.

As described above, the tilting means 36 has the bearing means 65 in the horizontal plane including the axis of the snubber roll 32.
Can be tilted about the tilt center, so that the axis of the snubber roll 32 can be tilted with respect to the vertical plane including the axis of the bridle roll 30.

FIG. 8 shows the snubber roll 32 by tilting the snubber roll 32 when the snubber roll 32 is offset with respect to the bridle roll 30, and the metal strip 28.
It is a schematic diagram which looked at the contact condition with the drive side. In FIG. 8, when the snubber roll 32 is not tilted,
As shown in FIG. 8A, the snubber roll 32 is at the position of the offset amount L, and the snubber roll 32 and the metal strip 28 are in line contact with each other. In FIG. 8, when the snubber roll 32 is tilted upstream by the tilt amount K1,
As shown in (2), the snubber roll 32 and the metal strip 28 are in surface contact with each other, and the contact area is significantly increased. In FIG. 8, when the snubber roll 32 is tilted downstream by the tilt amount K2, as shown in FIG.
2 and the metal strip 28 are no longer in contact with each other. Thus, when the snubber roll 32 is offset with respect to the bridle roll 30, the snubber roll 32 and the metal strip 28
Since the state of contact with is largely changed depending on the tilting direction and the tilting amount, the snubber roll 32 can apply a large meandering correction force to the metal strip 28.

FIG. 9 is a flow chart for explaining the operation of the meandering control device. In step s1, it is determined whether or not the tail end remaining length of the preceding metal strip coil 21 mounted on the payoff reel 23 is 10 m or less.
If this determination is negative, wait until this determination is positive. If this determination is affirmative, the process proceeds to step s2.

In step s2, the snubber roll 32 is pressed against the metal strip 28. The pressing of the snubber roll 32 is performed immediately before the metal strip 28 leaves the payoff reel 23 and the tension at the tail end becomes zero.

In step s3, it is determined whether the metal strip 28 meanders. The judgment is based on the meandering control device 2
This is performed depending on whether or not the meandering amount detecting means 29 of 0 detects the meandering amount of the metal strip 28. If the metal band 28 is not meandering, the process proceeds to step s6, and if the metal band 28 is meandering, the process proceeds to step s4.

In step s4, the control means 37 of the meandering control device 20 calculates the amount of tilting of the snubber roll 32 required to make the amount of meandering zero. The tilt amount calculation is
This is performed based on a calculation formula that is obtained in advance for each meandering direction. After the calculation, the tilting control signal corresponding to the calculated value is output from the control means 37 to the tilting means 36 of the meandering control device 20.

In step s5, the snubber roll 32 is tilted, and the meandering control of the metal strip 28 is performed. The tilting of the snubber roll 32 is performed by the tilting means 36. As described above, the snubber roll 32 is the bridle roll 3
Since it is offset with respect to 0, the meandering correction force can be applied to the metal band 28 by tilting by the tilting means 36, and the meandering of the metal band 28 can be corrected.

In step s6, it is determined whether the tail end of the metal strip 28 and the tip of the trailing metal strip coil 22 have been welded and the tension of the metal strip 28 has risen again. If this determination is negative, wait until this determination is positive. If this determination is affirmative, the process proceeds to step s7. In step s7, the snubber roll 32 is released.

As described above, according to this embodiment, the meandering of the metal strip 28 can be corrected even when the tension is not applied to the metal strip 28. Therefore, in the welding means 27 provided on the inlet side of the process line,
It is possible to prevent welding failure due to meandering of the tail end portion of the metal band 28 to which no tension is applied, for example, dogleg welding or step welding.

Incidentally, instead of the meandering amount detecting means 29 and the controlling means 37 of the present embodiment, the meandering control of the metal strip 28 can be suitably performed even if the operator performs visual control.

[0039]

As described above, according to the present invention, it is possible to control the meandering of the metal strip even when the tension is not applied by the meandering control device for the metal strip. With this welding means, it is possible to prevent welding defects due to meandering of the tail end of the metal strip to which no tension is applied, such as dog-leg welding and step welding. Therefore, breakage of the metal strip due to poor welding is prevented, and the downtime of the line is significantly reduced.

Further, according to the present invention, since the snubber roll is provided such that its axis line is spaced from the axis line of the bridle roll in the conveying direction of the metal band, the meandering correction force is significantly increased, and the metal band is greatly increased. The meandering correction can be performed more easily and surely.

Further, according to the present invention, since the tilting means can quickly and surely tilt the snubber roll,
The metal strip meandering control device can quickly and surely correct the metal strip meandering.

[Brief description of drawings]

FIG. 1 is a block diagram showing a simplified configuration of a meandering control device for metal strips, which is an embodiment of the present invention.

FIG. 2 is a perspective view showing a simplified configuration of a meandering amount detecting means in the meandering control device shown in FIG.

FIG. 3 is a side view showing a simplified configuration near a bridle roll of the meandering control device shown in FIG. 1.

FIG. 4 is a plan view showing a simplified configuration near the bridle roll shown in FIG.

5 is a partial cross-sectional side view near the tilting means of the meandering control device as seen from the section line VV shown in FIG.

FIG. 6 is a plan view of the vicinity of the tilting means of the meandering control device shown in FIG.

FIG. 7 is a sectional view taken along section line VII-VII shown in FIG.

FIG. 8 is a schematic view of the contact state between the snubber roll and the metal strip due to tilting of the snubber roll when the snubber roll is offset from the bridle roll, as viewed from the driving side.

FIG. 9 is a flowchart for explaining the operation of the meandering control device.

FIG. 10 is a plan view showing a simplified configuration of a meandering control device disclosed as a prior art.

FIG. 11 is a plan view showing a state in which a leading metal band and a trailing metal band are V-shaped at a welded portion.

FIG. 12 is a plan view showing a state in which a leading metal band and a trailing metal band are stepped at a welded portion.

[Explanation of symbols]

 9, 20 Meandering control device 10 Steering device 23, 24 Payoff reel 25 Shearing means 27 Welding means 29 Meandering amount detecting means 30 Upstream bridle roll 32 Upstream snubber roll 33, 35 Double-acting air cylinder 36 Tilt means 37 Control means 39 Displacement adjustment Means 41, 42 Image sensor 43 Light source 52 Swing holding base 61 Fixed base 65 Bearing means 69 Working side bearing support member 71 Moving base 72 Driving means 73 Connecting member 78 Screw rod 79 Connection arm 81 Guide rail 82 Sliding member 85 Driving side Bearing support member 90 Spherical roller bearing

Claims (3)

[Claims] 1. A payoff reel for supplying a metal strip coil, a shearing means for shearing the metal strip, a welding means for welding the metal strip, and a bridle roll for applying tension to the metal strip are arranged in this order. In the meandering control device of the configured process line, the meandering amount detection means is provided between the welding means and the bridle roll to detect the meandering amount of the conveyed metal strip, and the pressing roll for pressing the metal strip to the bridle roll. And tilting means for tilting the axis of the pressing roll with respect to a plane including the axis of the bridle roll, and driving the tilting means to tilt the axis of the pressing roll in response to the output of the meandering amount detecting means to drive the bridle. A meandering control device for a metal band, comprising: a control means for controlling a metal band wound around a roll so as not to meander. 2. The meandering control device for a metal band according to claim 1, wherein the pressing roll is provided such that its axis line is spaced from the axis line of the bridle roll in the metal band transport direction. 3. The bearing means for supporting one end portion in the axial direction of the pressing roll at a fixed position so as to be angularly displaceable around an axis line intersecting the axis line of the bridle roll, and the other end portion in the axial direction of the pressing roll. The meandering control device for a metal band according to claim 1 or 2, further comprising: displacement adjusting means for displacing and adjusting the portion substantially in the front-rear direction.