JPH0337773Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to the improvement of a tension leveler that corrects shape defects such as partial elongation and warping that occur during rolling of cold-rolled steel plates, stainless steel plates, aluminum plates, etc. It is something.

(Prior art) As shown in Fig. 1, the conventional tension leveler 4 has snubber rolls 6 and 5 on the entry and exit bridle rolls 2 and 3, which are intended for threading the strip 1. Therefore, the snubber rolls 5 and 6 were arranged at the frontmost roll of the entry bridle roll 2 and the frontmost or intermediate roll of the exit bridle roll 3. Incidentally, the snubber roll of the present invention is a non-driven roll having a mechanism capable of rolling down onto the facing bridle roll. Therefore, in the conventional tension leveler 4, when the strip tension is set to zero on the exit side of the line for dividing or inspecting the strip as shown in Fig. 2, the strip tension inside the tension leveler is also set to zero or low tension at the same time. This prevents slips between the bridle roll and the strip.

In this method, when the strip tension in the tension leveler 4 is changed from high tension to zero or to a low tension, the strip 1 in the tension leveler 4 changes the good shape part that had been corrected under high tension to the tension due to the decrease in tension. This is undesirable because the defective shape portion that has been corrected is mixed during the change.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned conventional problems, corrects partial elongation at the leading end, rear end, and leveling stop of the strip, and provides a tensioning system that can obtain a strip with less warpage. It provides a leveler.

(Means for Solving the Problems) The present invention provides a drive roll for the frontmost drive roll of the entry side bridle roll and a rearmost drive roll for the exit side bridle roll in the bridle rolls provided on the entry and exit sides of the tension leveler main body. The tension leveler is characterized in that each roll is provided with a snubber roll.

In other words, in this invention, when correcting the shape of a strip by passing it through a tension leveler, the strip tension in the tension leveler is high and the leveler roll is compressed by a predetermined amount, and the strip is repeatedly bent. but you can get
This was done in consideration of the fact that if leveling is carried out with the strip tension partially zero or reduced, the elongation and warping of the strip will not be good.

In particular, when a tension leveler is installed on a finishing line, there are frequent inspections of the quality of the strip, division of the wound coil into predetermined weights, and welding of the unwinding coil to the previous coil, each time at the line outlet and input sides. Since the strip tension becomes zero, if the strip tension in the tension leveler is maintained at a high tension in this state, a strip is generated between the bridle roll and the strip and the strip is drawn into the tension leveler. Therefore, it is unfavorable in terms of the quality of the strip and the operation of the tension leveler.

Therefore, the tension of the strip in the tension leveler had to be synchronized with the tension of the strip on the line outlet or inlet side to zero or to a low tension that would not cause stripping. As a result, the strip had a defective shape as described above. Therefore, in order to solve this problem and maintain a good strip shape over the entire length of the strip, it is necessary to maintain the strip tension in the tension leveler at a high level even when the strip tension on the line exit and entry sides becomes zero. It is.

For this reason, it is better to install the snubber roll that presses the strip against the bridle roll at a position farther away from the tension leveler body, as this will increase the length of contact between the strip and the bridle roll, which is advantageous in maintaining the strip tension at a high level. It is.

FIG. 3 shows the relationship between the position of the snubber roll and the retention limit value of the strip tension in the tension leveler. As the position of the snubber roll changes from bridle roll 3-1 to 3-7, the tension retention limit value increases. It is effective to install it on the roll at the rear of the line for the exit bridle roll 3.

That is, as shown in Fig. 4, snubber rolls are provided at the positions of rolls 2-1 and 3-7 of the inlet and outlet bridle rolls of the tension leveler main body, and the strips on the line outlet and inlet sides are compressed by compressing the strips. Even if the tension is reduced to zero, the strip tension within the tension leveler 4 can be maintained at a high level as shown in FIG. 5. In addition, in Fig. 4, if roll 2-1 or 3-7 is an idler roll, the snubber roll is roll 2-2 or 3.
-6 shall be installed.

(Effect of the invention) By installing the snubber rolls at predetermined positions of the entry and exit bridle rolls as described above, the tension of the strip in the tension leveler can be maintained at a high tension as shown in Fig. 5. A good shape can be obtained over the entire length, and the yield can be improved, making it extremely effective.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the position of the snubber roll in a conventional tension leveler, Fig. 2 is a diagram showing the operating method of a conventional tension leveler and the flatness and warpage in the longitudinal direction of the strip, Fig. 3 a, b 4 is an explanatory diagram showing the relationship between the snubber position and the holding limit value of tension within the leveler, and FIG. 4 is an explanatory diagram of the tension leveler showing the position of the snubber roll of the present invention.
FIG. 5 is a diagram showing the operating method using the tension leveler according to the present invention and the flatness and warpage in the longitudinal direction of the strip. 1... Strip, 2... Inlet bridle roll, 3... Outlet bridle roll, 4... Tension leveler, 5... Snubber roll, 6...
Snubber roll.

Claims (1)

[Scope of utility model registration request] In the bridle rolls provided on the entry side and the exit side of the tension leveler main body, a snubber roll is provided on the frontmost drive roll of the entry side bridle roll and the rearmost drive roll of the exit side bridle roll, respectively. Tension leveler.