SU578146A1 - Ring-rolling mill with automatic control of pressure roll actuator - Google Patents

Description

from the executive electric motor 16, the shaft of which is connected through a gearbox 17 and a pair of coic gears 18 to the shaft of the control throttle 8.

The following rollers 9 and 10 (Fig. 1 and 2) are installed asImmetrically with respect to the axis of rolling. Each of these rollers has the ability to move in guides fixedly mounted on the frame of the mill. These cavities serve as cavities of pneumatic or hydraulic cylinders 19 and 20, on the rods of which the following rollers 9 and 10 are fixed, respectively.

The guide rollers 9 and 10 (forming the axes of the pneumatic or hydraulic cylinders 19 and 20) are parallel to the lines connecting the contact points of the ring 1 with the rolling 2 and the corresponding next 9 and 10 rollers.

In the mill described, the follower rollers 9 and 10 can be installed on one side of the mill axis (Fig. 2), but can be moved at different angles a and p to this axis.

The following rollers 9 and 10 can be mounted asymmetrically on opposite sides of the mill axis (Fig. 2), if instead of the roller 10 a roller is used that can be moved at an angle of 7 to this axis (imitated: dashed lines).

One of the follower rollers 10 (Fig. 1) should be mounted for movement along the mill axis.

FIG. Figure 1 shows that the follower roller 9 can be mounted to move at an angle of 45 to the mill axis ((i - 45)). At that, the point of contact of the roller 9 with the ring 1 lies on the axis of the latter perpendicular to the mill axis.

The follower roller 9 (Figs. 1 and 2), which can be moved under a larger than the follower roller 10 angle to the mill axis (and in Fig. 1), is installed on the other side of this axis, into which the rotation of the ring is directed, between rolls 2 and 3.

The principle of operation of the mill described is as follows.

In the process of rolling the ring 1, the speed of removal of the pinch rollers 4 and 5 is automatically adjusted with the following rollers 9 and 10. If the ring 1 during rolling maintains the correct geometry, then the ratio of the movement values of the next rollers 9 and 10 is constant and

, ,, COSCX

equal to / c

The movements of the follow-up rollers 9 and 10 are converted into electrical signals taken from sensors And and 12, each of which is connected kinematically with its own roller through a respective gear 13 or 14. The ratio of signals is proportional to the value of K.

Structurally, for example, by performing transfers from the follow-up rollers 9 and 10 to sensors 11

and 12 with different ratios and choosing the appropriate schemes for the inclusion of these sensors, you can get equality of signals removed from them with the correct geometric form of ring 1. In this case, the proportionality factor of the signals is equal to one.

The signals from the sensors And and 12 enter the control unit 15, which, comparing the ratio of the signals with the reference one, produces the supply voltage of the electric motor 16 of the drive of the control system for moving the pressure rollers 4 and 5.

If the signal ratio is equal to the reference one, when the ring 1 in the rolling process retains the correct geometry, there is no voltage at the output of the control unit 15. The flow area of the throttles 8 remains constant. Pinch rollers 4 and 5 are retracted at a constant speed.

If the removal speed of the adjacent rollers 4 and 5 became less than the speed of rolling of ring 1, the latter is pulled out along the axis of rolling into the wrong oval. By this, the relative movement of the follower roller 9 decreases, and the follower roller 10 increases.

The signals of sensors 11 and 12 change accordingly. The ratio of the signals becomes higher than the reference one, and the control unit 15 generates such a deflection, which causes the electric motor 16 to rotate through the gearbox 17 and the pair of bevel gears 18 the shaft of the control throttle 8 in the direction of increasing its flow area. Drain from the left cavity of the hydraulic cylinder 6 increases, which leads to an increase in the rate of discharge of the pressure rollers 4 and 5.

The ovality of ring 1 is reduced. The relative movement of the follow rollers is flattened. The ratio of the sensor probes 11 and 12 decreases, approaching the reference. As soon as RING i takes the correct geometrical shape, the signal ratio becomes equal to the reference one, the direction at the output of the i5 control unit disappears, the electric motor 16 stops, the flow area of the control throttle 8 is no longer

The increase in the rate of removal of the pinch rollers 4 and 5 is stopped. Rolling of the ring is now happening. With the increased speed of removal of pinch rollers 4 and 5, which corresponds to the achieved rolling speed.

When the rolling speed decreases in relation to the speed of removal of the pressure rollers 4 and 5, the ratio of the signal from the sensor 12 to the signal from the sensor 11 becomes less than the reference one. The control unit 15 generates / voltage, which causes the electric motor 16 through the gearbox 17 and the bevel gear 18 to rotate the shaft of the control throttle 8 in the direction of reducing the flow area.