SU1207542A1 - Apparatus for counterbending of rolls of sheet mill - Google Patents

Description

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The invention relates to the rolling of metals, more specifically to devices designed to control the shape and profile of the strip during rolling.

The purpose of the invention is to improve the quality of rolled products.

The drawing shows a diagram of the device bending rolls of sheet rolling mill.

The device contains hydraulic cylinders 1, mounted between two pillows 2 working rolls 3 ,; hydraulic cylinders 4 installed between the right pads 5 of the work rolls 3, adjustable source 6 of fluid pressure, pressure setting unit 7, made, for example, on the basis of a potentiometer, unit 8, setting the pressure difference, made, for example, on the basis of a potentiometer, adder 9, element 10 comparisons, a controlled back pressure valve 11, first and second sensors 12 and 13 of fluid pressure. An adjustable source 6 of fluid pressure, for example, of a volumetric type, includes a reversible reversible rotary axial-piston hydromachine 14 driven by a direct current motor 15, the motor control unit 16, which is a thyristor converter and a oil tank 17. Sensors 12 and 13 are designed as pressure sensors of liquids with an electrical output, for example, of the type Crystal or DER. The controlled shut-off valve 11 is made, for example, in the form of a hydraulic distributor switched by an electromagnet. The output of the adjustable source 6 of the fluid pressure with hydraulic cylinders 1 installed between the left-side cushions 2 is connected directly, and to the hydraulic cylinders 4 installed between the right-side cushions 5 through a controlled shut-off valve 11, the control input of which is connected to the output of the element 10 compare. The pressure setting unit 7 is connected to the first input of the comparison element 10 and the first input of the adder 9, the second input of which is connected to the pressure difference setting unit 8, and the output of the adder 9 is connected to the second input of the controlled source of fluid pressure 6. The input and output of the first pressure sensor 12 are connected respectively to the output and the first input of the adjustable source 6 of the pressure fluid, the input is in the second 075422

The fluid pressure sensor 13 is connected to the hydraulic cylinders 4 installed between the right-hand cushions of the 5-working rolls, and its output is connected to the second input of the reference element 10. The control shut-off valve 11 is closed when there is no signal at its control input and is open when there is a signal at this input.

10 The device operates as follows.

Before the start of rolling by block 7, the predicted value of the fluid pressure is set. WITH

15 of the output of block 7, the reference signal is fed to the first input of the reference element 10 and through the adder 9 to the second input of the adjustable source 6 of the fluid pressure. Since at .20 the second input of the comparison element 10 there is a signal received from the sensor 13, corresponding to a different, previously set pressure level, then at the output of the comparison element 10 there is 25 a signal that goes to the control input of the controlled shut-off valve 11. At the arrival of the signal from the element 10 comparison to the control input of the controlled

30 of the check valve 11, the latter opens, provide liquid access from the adjustable source 6 to the hydraulic cylinders 4 installed between the right-hand cushions of the working rolls.

The signal received from the output of the adder 9 to the second input of the adjustable source 6 of fluid pressure, the motor control unit 16 acts on the motor 15, which creates a moment on its shaft proportional to the signal received from the control unit 16. Under the action of the torque of the electric motor 15, the hydraulic machine 14 delivers fluid from the tank 17 to the hydraulic cylinders 1 and through the open controlled shut-off valve 11 to the hydraulic cylinders 4. When the unit has reached

50 7 sets the pressure on the feedback signal of the first pressure sensor 14 and the pressure set is stopped. When a predetermined pressure is reached, the signal disappears and at the output of element 10,

55 because the signal at its input inlet becomes equal to the signal at its first input, which leads to the closing of the controlled shut-off valve

40

1 I and separation of hydraulic cylinders A from an adjustable source 6.

If during rolling of the strip it turned out that the predicted pressure value does not correspond to the required value and, as a result, the profile or shape of the strip has deviations from the norm, and the block 7 changes the set pressure to be proportional to the deviation in the direction of reducing the deviation. At the same time, the signals at the first and second inputs of the comparison element 10 become unequal. At the output of the element Yu, a signal appears that goes to a control input of a controlled control valve 11. The valve 11 opens and the adjustable source 6 changes the pressure in the hydraulic cylinders 1 and 4 to the new value given by Blok 7.

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With the appearance of asymmetrical shape defects or a strip profile, the change in the ratio between the pressure in the hydraulic cylinders 1 and the hydraulic cylinders 4 5 is carried out by the block 8 specifying the pressure difference. In this case, from the output of block 8 to the second input of the adder 9, a signal is positive. (Negative) polarity, 1 of which is in the adder for 9 s. the signal from block 7 and the resulting increased (reduced) signal is fed to the second input of the regulated source 6 of the pressure. Adjustable source 6 creates pressure proportional to. The signal received from the adder 9 and in the cylinders 1 the fluid pressure becomes equal to the algebraic sum of the tasks from blocks 7 and 8. Since the controlled shut-off valve 11 remained closed, the pressure in the cylinders 4 remained the same, i.e. equal to the previously specified block 7.

VNIIPI Circulation 518

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Branch PPP Patent, Uzhgorod, Proektna St., 4

Claims (1)

DEVICE 11 for anti-bending of rolls of a sheet rolling mill, comprising hydraulic cylinders installed between the left cushions of the work rolls, hydraulic cylinders installed between the right cushions of the work rolls, an adjustable fluid pressure source, a pressure setting unit and a first fluid pressure sensor, the input and output of which are connected respectively to the output and the first the input of an adjustable source of fluid pressure, characterized in that, in order to improve the quality of the rental, it further comprises a unit for setting the pressure difference, umator, comparison element, controlled shut-off valve and second fluid pressure sensor, wherein the controlled shut-off valve is connected in series with the output of the adjustable fluid pressure source and hydraulic cylinders installed between the right cushions of the work rolls, the control input of the controlled shut-off valve is connected to the output of the comparison element, pressure setting unit connected to the first input of the comparison element and the first input of the adder, the second input of which is connected to the unit for setting the pressure difference, and the output - w eye input controlled fluid pressure source, a second fluid pressure sensor input is connected to the hydraulic cylinders, installed between the right cushions Started sneeze roll, and its output is connected to the second input of the comparison element. 1 12