JPS6215295B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a leveling roll changing device for a tension leveler.

Generally, hot-rolled or cold-rolled metal strips have defective shapes, and are usually shipped as products after straightening the flatness with a tension leveler. In the tension leveler that corrects flatness, the mechanical properties in the width direction of the strip
A very high degree of flatness can be obtained if the dimensions are uniform, but if the strip has a rim layer with a low yield point at the end of the strip, such as rimmed steel, it is difficult to repeatedly roll it with a normal straight leveling roll. When a bending tension is applied, an edge wave is generated at the end of the strip where the yield point is low. To prevent this, a method of using a tapered roll is generally adopted. As shown in FIG. 1, this tapered roll has the same diameter at the center, and the outer diameter of the roll at the part that abuts the rim layer at the end of the strip 1 gradually becomes smaller toward the shaft end. The tapered roll 2 supported by the bearing 3 is not only ineffective unless a small diameter portion is maintained in the rim layer portion, but also may deteriorate its shape. Also, the degree to which the rim layer is below the yield point varies depending on the material.
An appropriate amount of taper is also required.

For these reasons, it is necessary to replace the tapered roll with an appropriate one each time depending on the material to be processed.

Continuous zinc plating line, continuous tin plating line,
In continuous color coating lines, continuous annealing lines, etc., strips are produced continuously.
When changing the processing material, it is necessary to quickly replace the tapered roll.

The conventional method for replacing rolls was to quickly open the leveling roll and manually pull it out and install the spare roll, but this method was extremely dangerous while the strip was running, and the roll When unloading and loading, the roll slips on the back-up roll or intermediate roll, resulting in damage to the roll surface. Furthermore, since it takes time to replace the rolls, there are many non-levelling parts, resulting in poor product yield.

For example, when the line speed is 100 m/min and the exchange time is 30 seconds, there are various drawbacks such as a 50 m non-levelling section.

This invention has been proposed to address the above-mentioned conventional problems, and aims to eliminate the conventional drawbacks by allowing rolls to be replaced quickly by simple means.

For this reason, the roll changing device of the present invention is provided with two sets of bearing arms having bearing parts for the leveling rolls at their ends so that the bearing parts can rotate to just below the operating position of the leveling rolls. A roll pedestal is provided on the outside of the bearing arm.
Furthermore, the present invention is characterized in that a common frame to which the bearing arm and the roll table are fixed is provided so as to be movable up and down.

Examples thereof will be described below with reference to the drawings.

FIG. 2 shows the basic roll arrangement of a tension straightening machine, in which 1 is a strip, 2 and 2' are leveling rolls, 4 and 4' are back up rolls, and 5 and 5' are bridle rolls. Backup roll 4, 4' is leveling roll 2,
2' and serves to prevent its deflection.

Taper rolls are usually leveling rolls 2, 2'
As shown in FIGS. 3 and 4, both ends of the bearing arm are supported by two sets of bearing arms 6, 6'. The bearing arms 6, 6' are swingably supported by support pins 9, 9' which are pivotally supported 8 on a lower frame 7 which can move up and down, and each bearing arm 6, 6' has a spur gear 10, 10. ' is fitted. 11,
11' is a pinion that meshes with spur gears 10, 10', and is fitted onto a drive shaft 13 that is rotatably supported 12 on the lower frame 7, and is linked to forward and reverse rotation of a manual handle 14 or a suitable drive device. The bearing arms 6, 6' are simultaneously swung in the same direction as shown by the dashed lines or solid lines in the figure via the pinions 11, 11' and the spur gears 10, 10'. Reference numeral 15 designates two sets of roll supports provided on both sides of the bearing arms 6, 6'.

The configuration of the present invention is as described above, and in order to replace the leveling roll 2 currently located at the leveling center position, first move the lower frame 7 down from the pass line and place the roll holder on the left side of the figure in FIG. When the leveling roll to be replaced is prepared on 15, and the drive device 14 is rotated to rotate the bearing arms 6, 6' as shown by the chain lines in the figure, the leveling roll 2, which is at the leveling center position, is moved to the right side in the figure. At the same time, the leveling roll prepared on the left roll pedestal 15 is transferred to the leveling center position, supported on the intermediate roll or back-up roll 4, and then the lower frame 7 is moved upward. and position it on the pass line to complete the roll replacement work. Next, to replace the rolls again, lower the lower frame 7, prepare the leveling roll to be replaced on the roll pedestal 15 on the right side in the figure, and move the bearing arms 6, 6' on the left side in the figure. The rolls can be replaced by rotating in the opposite direction.

The leveling rolls conveyed or prepared on the roll pedestal 15 can be safely replaced even while the strip is running by providing an appropriate protection device on the pass line side. In addition, although the example explained the replacement of the leveling roll 2 on the bottom surface of the strip, slight improvements to the roll holder etc. are applied based on the same principle for roll replacement when a tapered roll is incorporated into the leveling roll 2' on the top surface of the strip. It is extremely effective not only for changing the taper amount, but also for changing the roll diameter or replacing the roll due to roll damage.

Since the present invention has the above-described structure and operation, it is possible to change the rolls in an extremely short time, greatly reduce the non-levelling portion of the strip, and also make it possible to change the rolls safely without damaging the rolls. It has a familiarizing effect.

[Brief explanation of the drawing]

Fig. 1 is a schematic explanatory diagram of a tapered roll, Fig. 2 is a schematic diagram showing the basic roll arrangement of a leveler, and Fig. 3 is a schematic diagram showing the basic roll arrangement of a leveler.
Figure 4 is a front view of the roll changing device according to the present invention.
The figure is a sectional view taken along the line .about. in FIG. 3. 1... Strip, 2, 2'... Leveling roll (taper roll), 3... Bearing, 4, 4'...
Backup roll, 5, 5'... Bridle roll, 6, 6'... Bearing arm, 7... Lower frame, 9, 9'... Support pin, 10, 10'... Spur gear, 11, 11' ... Pinion, 13 ... Drive shaft, 14 ... Handle (drive device), 15 ... Roll pedestal.

Claims (1)

[Claims] 1 In a tension leveler, two sets of bearing arms each having a bearing part for the leveling roll at the tip end thereof are provided so that the bearing part can rotate to just below the operating position of the leveling roll, and the two sets of bearing arms have a bearing part for the leveling roll. A roll changing device characterized in that a roll pedestal is provided on the outside, and a common frame to which the bearing arm and the roll pedestal are fixed is provided so as to be movable up and down.