JPH04200917A - Device for jointing metallic strip - Google Patents

Abstract

PURPOSE:To accurately butt the strip during passing through and to weld it while running by arranging the pinch roll having the centering function on the inlet side or the outlet side of the welder of the strip continuous treating line. CONSTITUTION:To the pinch roll having the centering function, two pairs of pinch rolls 6, 7 are provided in a direction parallel to the lateral direction of the strip carrying path. The upper side pressing rolls 6a, 7a adjusted the pressurizing force with the rolling reduction cylinder 8. By monitoring the eccentric quantity of the strip with the meander detecting unit, the base stand 11 is moved to the direction to make this eccentric quantity small by operating the cylinder 12 for centering. And the pinch roll pair of left and right are moved respectively by theta, then the outside component force beta are generated, so it is operated so as to widen the strip in the lateral direction, and the wrinkles is not generated.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to continuous processing lines for metal strips (hereinafter simply referred to as strips), such as cold rolling, continuous pickling, continuous annealing, continuous plating, etc. of steel strips. In a line that processes strips through continuous threading, the preceding strip (hereinafter referred to as the leading strip) and the following strip (hereinafter referred to as the trailing strip) are joined together to thread the strip without any break. This invention relates to a strip joining device used for.

(Prior Art) This type of welding device is equipped with a welder and a means for transporting the strips, such as a transport roll and a guide, on the exit side, and the transport means further includes a welder, and a means for transporting the strips, such as a transport roll and a guide, when the strips are butted together prior to welding. It is customary to have a structure with a center link function to suppress meandering of the strip.

For example, JP-A No. 59-1.18281 and Utility Model Publication No. 59-1.18281] -1
Publication No. 00677 and the like disclose a centering mechanism formed by combining a guide, a clamp, a cylinder, and the like.

(Problem to be solved by the invention) In the above centering mechanism, damage to the strip,
In other words, in order to avoid edge bending or cracking due to contact between the strip edge and the guide, or occurrence of scratches on the plate surface due to contact with the clamp, the following steps should be taken: Centering is not performed during line passing, such as during feeding of a trailing strip, that is, it is necessary to perform centering after each strip stops, which is an obstacle to shortening welding work time.

On the other hand, when centering after stopping the strip, wrinkles are likely to occur especially in the parts of the thin material that are held down by the slip and slip guides, and if wrinkles occur, the centering by the guide becomes insufficient, and the welded joints will not be properly centered. The planar shape of the l-1 lubricant is bent, forcing so-called dogleg welding, and furthermore, if the wrinkled area is clamped, the wrinkles will not recover even after welding is completed, which will impede subsequent sheet threading.
It remains as a defect.

In addition, in a line that passes steel plates continuously, a looper is placed on the output side of the welding machine as a buffer mechanism for the processing line, and the line tension on the welding machine side and inside the looper is divided via a priddle roll. If the steel plate thickness range or wide line to be processed is customary, the retention force of the priddle roll between the welding machine and the looper must be ensured, otherwise the strip will be drawn into the looper during the early stages of welding. . This drawing in of the strip becomes more pronounced as the thickness of the strip becomes thinner. This problem can be solved by installing a presser roll on the entrance or exit side of the welding machine as an auxiliary mechanism for the priddle roll, or depending on the shape of the steel plate (unilateral elongation, camber, wedge, etc.), a presser roll or a strip can be used. This may cause ``<-shaped welding''.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a strip joining device that can center a strip during threading without causing shape defects or surface defects.

(Means for Solving the Problems) The present invention provides at least one of the input side and output side of a welding machine that joins the abutting portion between the tail end of a leading strip and the tip end of a trailing strip in a continuous strip processing line. A strip joining device characterized in that a pinch roll with a centering function is arranged on one side.

In addition, the pinch roll with a centering function has a two-layered roll with a surface layer around the roll body, and the surface layer has multiple elastic layers tilted toward the roll axis with respect to a plane perpendicular to the roll axis. In practice, it is advantageous to have a collection of elastic bodies, each of which has the ability to elastically deform in response to an applied external force.

(Function) As shown in FIG. 1, the welding device according to the present invention has pinch rolls 2 with a centering function disposed on the entrance and exit sides of the welding machine 1 [7. A device for achieving centering during sheet threading] It is. Note that 3 is a position detector at the end of the strip.

Since this welding device has a pinch roll with a centering function arranged on the input side and/or output side of the welding machine 1, the tail end of the leading strip 4 shown in FIG. (b), and the tip of the trailing strip 5 reaches the position where it meets the tail end of the leading strip 4 from the welding machine entry side, as shown in FIG. It is possible to center the strip at one end or at the free end during threading, etc. In other words, in the process of reaching the butting position, centering can be performed without wrinkles, as shown in Figure (C).
It is possible to achieve abutment in which the leading strip 4 and the trailing strip 5 are brought into uniform contact with their end surfaces without any deviation. Therefore, the leading strip 4 and the trailing strip 5 can be linearly welded together without any wrinkles or flaws in the strips during sheet passing.

(Example) A preferred embodiment of the pinch roll 2 with centering function in the joining apparatus shown in FIG. 1 is shown in FIG. 3. The pinch roll with centering function is composed of two pairs of pinch rolls 6.7 arranged in parallel in the width direction of the strip conveyance path, and presser rolls 6a, 7a on the two sides of each pinch roll.
The pressing force J is adjusted by the pressing cylinder 8.

These pinch rolls 6.7 are supported by a frame 10 via bearings 9, this frame 10 is supported by a base 11,
Furthermore, a center link cylinder 12 is installed on this base 11.

The centering of the strip using the pinch rolls described above is carried out as follows.

A meandering detector (not shown) installed near the welding machine including the pinch roll monitors the amount of eccentricity of the strike J knob.

By operating the centering cylinder 12 to move the base 11 in a direction that reduces this amount of eccentricity, the strip is returned to the center of the conveyance path.

Further, since the force acting on the strip from the pinch rolls during centering is applied so as to spread the strip in the width direction, wrinkles do not occur in the strip. This steering is realized, for example, as shown in FIG. 3(b), by swinging the left and right pinch roll pairs from the traveling direction toward the side edges by an amount θ to generate an outward component force β.

Furthermore, since the strip is held down by the presser rolls 6a and 7a, even if the holding force of the bridle roll between the welding machine and the looper decreases due to roll wear, the strip will not be drawn into the looper, making it easier to maintain the equipment. increases.

Next, another preferred example of the pinch roll 2 with centering function in the joining apparatus shown in FIG. 1 is shown in FIG. 4. The illustrated example is a pinch roll that allows easy centering even when the strip is moving at low speed and under no tension, and also allows centering even when the strip is stopped. The force has the advantage of acting uniformly across the width of the strip.

That is, each roll of the illustrated pinch roll has a roll axis 1
A surface layer portion 15 is provided along the outer periphery of a thin cylindrical roll body 14 coaxially fixed to the roll body 3. This surface layer portion 15 is
The constituent element is an elastic body 16 that is fixed to the inner diameter or the outer circumference of the roll cylinder 14 in an attitude tilted toward the roll axis 13 with respect to a plane orthogonal to the roll axis 13, and a plurality of elastic bodies 16 are attached in the inclined direction or as strips. 4 conveyance path center L (center of roll body length)
The rollers are arranged at approximately equal intervals in the direction of the roll axis 13 in a symmetrical direction. The elastic body 16 is made of an elastic material such as non-woven fabric, and when pressure is applied to the surface layer 15 of the roll in the radial direction, the inclination of the elastic body 16 to which pressure is applied increases, and when the pressure is removed, it returns to its original state. The structure is as follows.

As mentioned above, the elastic body that makes up the roll surface layer is
In addition to having elasticity itself, the roll cylinder to which the elastic body is fixed may be made of an elastic material, and the elastic body may be made of a highly rigid material, so that the inclination of the entire elastic body can be changed and restored. Furthermore, the elastic body is not limited to a continuous body as shown in the illustrated example, but may be discontinuous like flower petals, or a collection of striated bodies, so-called a brush.In short, the elastic body is elastically deformed in response to external force. The material and shape are not restricted as long as the

The mechanism that enables centering of the strip when the above-mentioned roll whose surface layer is covered with an elastic material in a pleated manner (hereinafter referred to as an inclined pleated roll) is pressed against the strip will be explained in detail with reference to Fig. 5. state

This figure schematically shows the state in which the inclined pleated roll is pressed against the surface of the strip 4.
) corresponds to the side, and figure (b) corresponds to the front, respectively.The definitions of the symbols in the figures are as follows.

D = Radius of the roll cylinder - Amount of movement h of the tip of the elastic body: Amount of sinking of the elastic body From the same figure, it is possible to derive 5=HG-EF, where EF=II sin θ2.

The above equation shows that the strip can move by the above amount S when there is no slippage between the tip of the elastic body and the strip surface.

Therefore, even if the strip is stationary or is not under tension, it is possible to move the strip in the roll axis direction by applying pressure to the roll.

Furthermore, when the roll is rotating, the elastic body pressed against the strip will be updated and moved, so the inclination of the elastic body will be increased sequentially, and the strip will be forced to move by the above amount S each time. That will happen.

In this inclined pleated roll, the greater the inclination of the elastic body and the greater the pressing force of the roll, the longer the strip travels, and the easier it is to adjust the strip travel. Note that the amount of movement of the strip in response to the pushing force of the roll can be arbitrarily set depending on the material of the elastic body, inclination, length in the radial direction, density, structure of planting on the roll body, etc.

Further, when the roll is rotating, the amount of movement of the strip increases in proportion to the number of rotations.

In the illustrated example, the strip 4 is pinched using inclined pleated rolls arranged vertically in which the direction of inclination of the elastic body 16 which plays the above-mentioned role is symmetrical with respect to the center of the conveyance path. Since the direction of inclination Y1 of the elastic body of the roll and the direction Y2 of the steering force are the same, the strip 4
is always subject to a centering force. Note that FIGS. 3B and 3C schematically show the distribution of the steering force (per unit axial length) generated in the inclined pleated roll in the axial direction.

In the figure, the product of the vertical axis and the horizontal axis represents the steering force.

In other words, if the strip 4 deviates from the conveyance path, the same figure (C
), the steering force increases on the long side (Y4) where the contact length between the inclined pleated roll and the strip is at the center of the conveying path, and the strip 4 moves to the opposite side. As a result, the strip 4 advances to the point where the contact length is equal on both sides of the center of the conveyance path, as shown in FIG. The position of the strip is fixed because the steering forces of the two are counterbalanced.

Therefore, if the inclined pleated rolls shown in FIG. 4 are used, centering can be performed with one pair of inclined pleated rolls as shown in FIGS. 6(a) and (b), and the position detector 3 An appropriate center link can be obtained by detecting the amount of eccentricity of the strip 4 by arranging the eccentricity of the strip 4, and operating the reduction cylinder 8 on the working side or the drive side in accordance with the detected amount.

Furthermore, as shown in FIG. 7(a), a roll according to FIG. 4 is arranged on either side of the pinch rolls, and the other -+3
It is also possible that - and - are rolls with no normal steering ability. The centering function in this case is as explained in FIG.

In the example of FIG. 7(a), it is also possible to force the strip to pass through at a desired position by tilting the inclined pleated rolls, that is, by making the roll gaps uneven, as shown. That is, when the roll is tilted, the steering force per unit axial length of the tilted pleated roll exhibits a distribution where it is maximum on the side where the rolling reduction is large. Since the centering force acts so that the steering forces on both sides of the center of the conveyance path are opposite and equal, by tilting the roll as shown in Figure (b), the center of the width of the strip can be moved a distance from the center of the conveyance path. Only S can be intentionally shifted. This operation is particularly advantageous when the strip itself has a bend and the eccentricity caused by the bend is to be corrected.

(Effects of the Invention) According to the welding device of the present invention, it is possible to center the strip being threaded without using guides or clamps, that is, without the occurrence of wrinkles. Since the joint can be welded, welding work time can be significantly shortened. In addition, centering allows the strips to butt together accurately, making it possible to achieve normal welding without dogleg welding.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing a welding device according to the present invention, Figs. 2 (a) to (C) are schematic diagrams explaining the centering function of the rolls, and Fig. 3 shows a pinch roll with a centering function used in the welding device. 4 and 7 (a) are side sectional views showing a pinch roll with a centering function according to the present invention, and FIGS. 4 (b) and (C).
and Fig. 7(b) is a schematic diagram showing the magnitude of centering force, Fig. 5(a) and (b) are schematic diagrams explaining the steering mechanism by roll, and Fig. 6(a) is a schematic diagram showing the centering force. 2 is a two-sided view showing an example of application of the pinch roll, and FIG. 2B is a side view thereof. 1... Welding machine 2... Pinch roll with centering function 3... Position detector 4... Leading strip 5... Trailing strip 6, 7... Pinch rolls 6a, 7a.
・・Pressure roll ・・Reduction cylinder 9 ・・Bearing 10 ・・Frame 11 ・・Base 12 ・・Centering cylinder

Claims (1)

[Claims] 1. In a continuous metal strip processing line, at least one of the input side and output side of a welding machine that joins the abutting portion of the tail end of the preceding metal strip and the tip of the trailing metal strip. A metal strip joining device characterized in that a pinch roll with a centering function is arranged on one side. 2. The pinch roll with centering function has a two-layered roll with a surface layer around the roll body, and the surface layer has a plurality of layers inclined toward the roll axis with respect to a plane perpendicular to the roll axis. 2. The device according to claim 1, wherein the device is a collection of elastic bodies, each elastic body having the ability to elastically deform in response to an applied external force.