JPH08215750A - Unit roller device for down coiler - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the occurrence of flaws on the strip surface when the strip is wound around a coil in a down coiler. [Structure] The strip step portion detecting means 7 installed on the upstream side of the rotation of the unit roller device is a strip 23.
The step portion 23a at the tip is detected. The unit frame position controller 8 that has received the detection result rotates and retracts the unit frame 3 to a certain position in response to the coil winding weight,
In addition, the unit roller pressing force controller 9 releases the hydraulic pressure of the unit roller pressing hydraulic cylinder 10 to quickly retract the unit roller 6, and reduces the coil pressing force at the position corresponding to the step portion 23a. Therefore, the surface defects of the strip due to the step portion 23a can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a unit roller device for tightly winding a coil by contacting the surface of the coil when the steel strip is wound on the coil by a down coiler, and more particularly, at the tip of the strip at the beginning of winding of the coil. The present invention relates to a unit roller device for preventing the occurrence of surface defects due to a step portion.

[0002]

2. Description of the Related Art A conventional unit roller device of a down coiler for winding a strip is disclosed in Japanese Patent Application Laid-Open No. 62-62.
There is one disclosed in Japanese Patent Publication No. 179814. In this down coiler, the strip is wound up as shown in FIG. That is, until the strip 23 guided by the pinch roll 21 and the guide 22 and entering the mandrel 24 is completely wound,
The mandrel 24 rotates at a reading speed with respect to the threading speed of the strip 23, and after the winding is completed, the mandrel 24 rotates in synchronization with the threading speed.

The unit roller 25 in this down coiler is arranged around the mandrel 24, and in order to wind the strip 23 around the mandrel 24 without loosening, the strip 23 is pressed toward the mandrel 24 with a constant pressure, and like the mandrel 24, the threading is performed. It rotates at a certain reading speed relative to the speed.

The unit roller 25 and the unit roller frame 26 are attached to the unit frame 29 via a pin 27 and a buffer spring 28, and the unit frame 2
9 is rotatable about a pin 30 attached to the housing, and is pressed in the direction of the mandrel 24 by a piston rod 33 connected to a piston 32 in a hydraulic cylinder 31. The hydraulic cylinder 31 is adjusted so as to maintain a set pressure that varies depending on the plate thickness.

However, the conventional general down coiler has the following problems when the strip is wound around the coil. That is, when the strip 23 is wound around the mandrel 24, the tip of the strip 23 rotates together with the mandrel 24. As shown in FIG. 3, when the tip of the strip 23 reaches the position of the unit roller 25,
A stepped portion at the tip of the strip 23 (in general, from the (n-1) th winding to the (n-2) th portion such as a portion changing from the first winding to the second winding)
The unit roller 25 is abruptly pushed up (bounced up) by the portion changing to the roll}, and the impact at that time causes the position corresponding to the tip of the strip 23 to fall into the inner surface of the strip 23 wound on the outside, There is a problem that flaws (called top marks) occur on the surface.

Further, due to the sudden jump of the unit roller 25, the time for the unit roller 25 to press the strip 23 against the mandrel 24 is reduced, and the strip 2
3 does not wind tightly around the mandrel 24, and slippage occurs on the surface of the strip 23 just before the winding is completed, which causes scratches and deteriorates the winding shape of the coil.

Therefore, in the down coiler disclosed in Japanese Patent Laid-Open No. 62-179814, in addition to the unit roller 25 described above, when the strip 23 is wound around the mandrel 24, the tip end of the strip 23 is removed. Distance detecting means for detecting passage of the formed step portion of the strip 23 from the distance to the surface of the strip 23 which changes as the step portion passes, and the step portion rotates the mandrel 24 more than the distance detecting means. A position control device for moving the unit roller 25 in the retreating direction based on a signal from the distance detecting means when the unit roller 25 arranged on the downstream side in the direction is reached, and a pressing force of the unit roller is applied to the tip of the strip. And a pressing force adjusting device that adjusts according to the shape of the stepped portion.

[0008]

However, in the down coiler disclosed in Japanese Unexamined Patent Publication No. 62-179814, the unit frame 29 is moved to the piston 32 in the hydraulic cylinder 31 to retract the unit roller 25. The piston rod 33 connected to the housing causes the piston 30 to rotate (counterclockwise in FIG. 2) around the pin 30 attached to the housing so as to be retracted, which causes the following problems. That is, since the unit frame 29 has a large weight, when the unit roller 25 is to be moved in the retreating direction based on the signal from the distance detecting means, due to its inertia, the unit frame 29 is completely moved to the retreat scheduled position. However, even if the stepped portion at the tip of the strip 23 comes to the position of the unit roller 25, the unit roller 25 has not yet completed the evacuation,
Moreover, it takes too long to return to the original state, and the unit roller 25 is separated from the surface of the strip 23 for too long. Therefore, as described above, the stepped portion at the tip of the strip 23 is embedded in the inner surface of the strip 23, which causes a top mark on the surface, causes scratches, and deteriorates the coil winding shape. There was a problem that was not solved yet.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and when the strip is wound around the coil in the down coiler, the unit frame is retracted in accordance with the winding speed of the coil. When the strip step reaches the unit roller position, the unit roller pressing force can be promptly reduced based on the step detection signal at the end of the strip, and the strip surface can be pressed promptly after passing the step. The purpose is to provide a device.

[0010]

A unit roller device according to the present invention is a unit which is rotatably supported by a rotation supporting shaft and which is rotated around the rotation supporting shaft by a unit frame rotating hydraulic cylinder. A frame, a unit roller frame that is rotatably supported by a rotation support shaft provided in the unit frame, and is given a force in a direction away from the unit frame by an elastic force of an elastic body, and this unit. A unit roller rotatably supported by a roller frame and in contact with the outer surface of the strip wound on the down coiler, a step portion detecting means for detecting a step portion at the tip of the strip wound by the down coiler, and this step portion detecting means. A unit for controlling the position of the unit frame by issuing a command to the hydraulic cylinder for rotating the unit frame in response to a signal from the unit frame. In a unit roller device of a down coiler having a frame position controller, the unit roller pressing hydraulic cylinder for changing the pressing force of the unit roller and the unit roller pressing hydraulic cylinder are generated in response to a signal from the step portion detecting means. And a unit roller pressing force controller for controlling the pressing force to be applied.

[0011]

The step detecting means detects the step at the tip of the strip, and the signal is sent to the unit frame position controller and the unit roller pressing force controller.

Then, a command is issued from the unit frame position controller to the unit frame rotating hydraulic cylinder, hydraulic pressure is supplied to the unit frame rotating hydraulic cylinder, the unit frame rotates, and the coil is thickened. Correspondingly retreat.

At the same time, an operation command is issued from the unit roller pressing force controller to the unit roller pressing hydraulic cylinder. By this command, the hydraulic pressure supplied to the unit roller pressing hydraulic cylinder and pressing the unit roller against the coil is released.

As a result, the unit roller can be driven only by the elastic force of the elastic body (spring, pneumatic cylinder, etc.).
As it comes into contact with the surface of the strip that is being wound up, when the stepped portion at the end of the strip passes through this unit roller, a top mark is generated on the surface of the strip that is newly wound up. There is no.

When the step passes through the unit roller, the hydraulic pressure is again supplied to the unit roller pressing hydraulic cylinder, and the unit roller is quickly pressed against the coil. Since the retracting operation of the unit roller is performed only by rotating the unit roller frame, the inertial force is smaller than that when the retracting operation is performed by rotating the unit frame. Therefore, it is possible to shorten the time that the unit roller is separated from the surface of the strip being wound, and wind the coil tightly. Therefore, slip does not occur between the strip and the mandrel unit roller, and scratches do not occur.

Although there are a plurality of unit roller devices for one down coiler, each of them operates as described above.

[0017]

EXAMPLE A unit roller device according to an example of the present invention is
This will be described with reference to FIG. This unit roller device includes a unit frame 3 which is rotatably supported around a pin 1 and is rotated around the pin 1 by a unit frame rotating hydraulic cylinder 2, and a pin 3 a provided on the unit frame 3. A unit roller frame 5 which is rotatably supported by the unit roller 5 and is given a rotational force in a direction away from the unit frame 3 by the elastic force of the buffer spring 4, and the unit roller frame 5 is rotatably supported by the unit roller frame 5. Strip 23 wound around mandrel 24 of down coiler
The unit roller 6 that contacts the outer surface (which is also the outer surface of the coil), and the strip 23 wound by the mandrel 24.
A step detector 7 that detects the step 23a at the tip and a signal from the step detector 7 issues a rotation command to the unit frame rotating hydraulic cylinder 2 to control the position of the unit frame 3. The unit frame position controller 8 and the unit roller pressing force controller 9 which controls the pressing force of the unit roller 6 by the signal from the stepped portion detector 7 and the command from the unit roller pressing force controller 9 A unit roller pressing hydraulic cylinder 10 for rotating the unit roller frame 5 to change the pressing force of the unit roller 6 is provided. In FIG. 1, reference numeral 11 is a hydraulic cylinder for constantly pressing the unit frame 3 toward the mandrel 24.

In this unit roller device, a method for changing the pressing force of the unit roller 6 when the step portion 23a at the tip of the strip 23 reaches the position of the unit roller 6 will be described below. That is, the strip 23 enters the down coiler and the mandrel 24
Through the gap between the unit roller 6 and the unit roller 6, the unit roller pressing hydraulic cylinder 10 winds the mandrel 24 while pressing it against the mandrel 24 and then winds it up.

When the step detector 7 detects the step 23a at the tip of the strip 23 while the strip 23 is wound around the mandrel 24 as described above, the step detector 7 A unit frame position controller 8 for controlling the unit frame rotating hydraulic cylinder 2 of the unit roller device arranged immediately downstream and a unit roller pressing force controller 9 for controlling the pressing force of the unit roller 6. A step passing signal is sent. At this time, the unit roller pressing force controller 9 calculates the passage time of the step 23a after the second roll.

Then, a certain time after the step detector 7 detects the passage of the step 23a, a command is issued from the unit frame position controller 8, the unit frame rotating hydraulic cylinder 2 is operated, and the unit is rotated. The frame 3 rotates counterclockwise around the pin 1 and retracts to a predetermined position. When the unit frame 3 rotates counterclockwise around the pin 1, the buffer spring 4 pressing the unit roller frame 5 toward the mandrel 24 expands, and the unit roller 6 contacting the surface of the strip 23 disappears. Although it tries to separate from the surface of the strip 23, the unit roller 6 is pressed against the surface of the strip 23 by the unit roller pressing hydraulic cylinder 10 with a force larger than the force to separate, so that the stepped portion 23a becomes a unit. When passing through the roller 6, the coil diameter increases stepwise by the plate thickness, so that the strip 23 of the newly wound portion is strongly pressed against the unit roller 6. Therefore, immediately before the step 23a at the tip of the strip 23 passes the unit roller 6, a command is issued from the unit roller pressing force controller 9 to the unit roller pressing hydraulic cylinder 10 so that the unit roller pressing hydraulic cylinder 10 receives the hydraulic pressure. Is supplied to retract the cylinder rod. Therefore, the force pressing the unit roller 6 against the surface of the strip 23 is only the elastic force of the buffer spring 4, and even if the step 23a passes through the unit roller 6, the strip 23 strongly presses against the unit roller 6. Therefore, the surface of the strip 23 is not damaged.

Since the unit roller frame 5 is lighter in weight than the unit frame 3, the inertia force is small and the unit roller 6 can be instantly moved. Therefore, when the unit roller 6 passes through the step 23a. Can be released from the surface of the strip 23 only for a short time, and after passing, hydraulic pressure is supplied to the unit roller pressing hydraulic cylinder 10 to advance the cylinder rod and quickly press the surface of the strip 23. Further, the unit roller 6 is pressed against the surface of the strip 23 by the elastic force of the buffer spring 4 even during a short time while the cylinder rod of the unit roller pressing hydraulic cylinder 10 is retracted and the cylinder rod is advanced again. Therefore, the unit roller 6 does not separate from the surface of the strip 23 in all the steps during coil winding.

Therefore, no flaw is generated on the surface of the strip wound around the coil, and the coil is tightly wound.

In the description of the embodiment, the timing of passage of the stepped portion 23a at the tip of the strip 23 at the position of the unit roller 6 is determined by the arithmetic unit based on the timing of passage of the first winding after the second winding. Although the calculation has been described, the deformation of the surface of the strip 23 wound around the coil may be detected optically or electrically to grasp the passage of the step.

Further, by further considering the responsiveness of the hydraulic system acting on the unit roller pressing hydraulic cylinder 10, the above-mentioned effects can be naturally obtained without using the buffer spring 4.

[0025]

As described above, according to the present invention, it is possible to provide a unit roller device capable of promptly retracting and returning in response to passage of a stepped portion of a strip when the strip is wound by a down coiler, and the top mark of the strip caused by the stepped portion can be provided. It is possible to prevent the occurrence of scratches and the like, and the winding shape of the coil does not deteriorate.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a unit roller device according to an embodiment of the present invention.

FIG. 2 is a side view showing a conventional strip winding device.

FIG. 3 is an explanatory view showing a state in which a strip is wound by a conventional strip winding device.

[Explanation of symbols]

 1 pin 2 hydraulic cylinder 3 unit frame 4 buffer spring 5 unit roller frame 6 unit roller 7 step detector 8 unit frame position controller 9 unit roller pressing force controller 10 unit roller pressing hydraulic cylinder-11 hydraulic cylinder

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuyoshi Ohira 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd.

Claims (1)

[Claims] 1. A unit frame rotatably supported by a rotation support shaft and rotated around the rotation support shaft by a unit frame rotation hydraulic cylinder, and a rotation support provided on this unit frame. A unit roller frame that is rotatably supported by a shaft and is given a force in a direction away from the unit frame by elastic force of an elastic body, and a unit roller frame that is rotatably supported by the unit roller frame and is wound around a down coiler. The unit roller contacting the outer surface of the strip to be taken, the step portion detecting means for detecting the step portion at the end of the strip wound by the down coiler, and the unit frame rotating hydraulic cylinder receiving a signal from the step portion detecting means. Unit of down coiler having unit frame position controller for issuing command and controlling position of unit frame In the roller device, a unit roller pressing force that controls the pressing force generated by the unit roller pressing hydraulic cylinder that changes the pressing force of the unit roller and the pressing force generated by the unit roller pressing hydraulic cylinder in response to a signal from the step detecting unit. A unit roller device for a down coiler, which is provided with a controller.