Hydraulic control method for asymmetrical bowed roller of rolling mill
A control method and asymmetric technology, applied in the field of steel rolling, can solve problems such as inability to achieve asymmetric roll bending, and achieve the effects of eliminating unilateral corrugated plate defects, increasing product yield, and improving plate quality.
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Embodiment 1
[0028] See figure 2 , F W0 and F WD Indicates the bending force on both sides of the work roll, F W0 =F WD For symmetrical bending roll, F W0 ≠F WD It is an asymmetric bending roll.
[0029] Rolling mill asymmetric roll bending hydraulic control method, the control method of this embodiment is relatively simple, compared to the prior art (refer to figure 1) The work roll bending hydraulic system has less modification, only needs to change the direction of the pipeline behind the valve table outlet shutter appropriately, without adding any hydraulic components. This solution can switch between symmetrical roll bending and asymmetrical bending roll through the setting value of the PLC control program, but it cannot switch between positive and negative bending rolls without dead zone, so this solution can only be used for positive roll bending, suitable for Middle stands of tandem cold rolling mills, not applicable to final stands or skin pass mills.
[0030] See image...
Embodiment 2
[0033] See Figure 4 , this scheme is on the basis of embodiment 1 (with reference to figure 1 ), by adding eight shutters. Two switches are installed on the oil circuit of the operation inner roll bending hydraulic cylinder 2 and the transmission inner roll bending hydraulic cylinder 3 of the upper and lower work rolls A. The switch 16 is connected with the inner roll bending hydraulic cylinder 2 and the bending roll hydraulic cylinder. The 3 rod sides are connected, and the switch 17 is connected to the rodless side of the operation inner roll bending hydraulic cylinder 2 and the transmission inner roll bending hydraulic cylinder 3. When the symmetrical roll is bent, the switch 16 and the switch 17 are opened at the same time. During asymmetric roll bending, the shutter 16 and the shutter 17 are closed simultaneously.
[0034] Install the switch 14 and the switch 4 15 on the oil circuit of the upper and lower work roll A to operate the outer bending hydraulic cylinder 1 an...
Embodiment 3
[0039] See Figure 5 , this scheme is on the basis of embodiment 1 (with reference to figure 1 ), adding four pairs of guides (two-way hydraulic locks) and two reversing valves. Conductors 24 and 25 are installed on the bending oil circuit inside the upper and lower working rolls A to realize the conduction and cut-off control of the rod side and the non-rod side of the inner 8 bending hydraulic cylinders respectively. The guide 22 and the guide 4 23 are installed on the outer bending roll oil circuit of the upper and lower working rolls to realize the conduction and cut-off control of the rod side and the rodless side of the 8 outer bending roll hydraulic cylinders respectively.
[0040] The conduction and cut-off of the rod side and the non-rod side of the bending roll hydraulic cylinder on the operation side of the upper and lower work rolls are respectively controlled by the conduction device 26 and the conduction device 27, and the rod side and non-rod side of the bendin...
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