SU1219197A2 - Apparatus for controlling the angle of feed of strip into stand of continuous rolling mill apparatus for controlling the angle of feed of strip i - Google Patents

Description

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The invention relates to rolling production, namely, controls for auxiliary mechanisms of rolling mills, can be used on continuous and reversing mills - cold rolling, in particular when rolling butt-welded strips, is designed to adjust the angle of entry of the work rolls and the modification of the known device described in ed. No. 1026871. The purpose of the invention is to increase the reliability of the mill by reducing the number of stripes.

 The drawing shows a functional diagram of the proposed device for adjusting the angle of entry of the strip into the stand of the continuous rolling mill (for one inter-stand gap).

. The device contains strip thickness meters 1, a strip speed sensor 2, guide rollers 3 for changing the angle of entry of the strip into the drive drive stand movement drive stand A, the guide roll movement control unit 5, the guide sensor 6, comparison block 7, sensor 8 position- neither the guide roller support, the weld indication sensor 9, the OR element 10, the first switch 11, the second switch 12, the control of the guide roller support movement meter 13, the guide roller support adjuster 14, the inverter 15, the increment calculation unit 16 the angle of entry of the strip into the rolls, control block 17.

The device additionally contains

about. the second logical element OR 18, the third and fourth keys 19 and 20, respectively, the second inverter 21 and comparator 22, the memory-controlled blocks 23 according to the number of stands, while the outputs of the sensor 8 of the position of the guide rollers support are additionally connected to the control input block 23, the other control input of which is connected to the output of the control block 17, and the output through the comparator 22 is connected to the control input of the third key 19 and through the second inverter 21 to the control input of the fourth key 20, and inverse the second exit block2191972

16 for calculating the increments of the entry angle of the strip, respectively, through the third and fourth keys 19 and 20 and the second logical element OR 18

5 are connected to the input of the regulator 14 of the roller bearings.

The device works as follows.

In the initial state (when

10, rolling strips free from seams are carried out. The first control key 12 is closed and the second control key 11 is open. Through the key 11 to the input of block 5

15, the drive control 4 of the support of the guide rollers 3 is connected to the output of the block 7 comparing the moments Mj and M of the upper and lower rolls of the mill stand. With this device

20 works to maintain the current angle q of the entrance of the strip into the cage, at which the moments on the spindle x Mj and Mg would be equal to each other (M, M2).

25 When a seam passes in the indication zone of the sensor .9 installed in front of the cage, the latter triggers and a signal about the presence of a seam enters the control block 17, where delay time 2 is formed 3

L

V

- t,

where L is the distance from the seam sensor 9

to the cage, m,

V - rolling speed, m / s; t - the average time of working out

displacements D S of roller supports for additional measuring Ai of the angle of entry of the strip into the cage, c.

After the termination, at the output of control block 17, a signal of a logical unit appears, which opens the key 12, through the inverter 15 closes the keys 11 and resets to. zero controlled meter 13 displacement. At the same time, the control unit 17 begins to form the following time delay 2.

To the control unit 5 of the drive 4 for the support of the rollers 3, instead of the output of the moment comparison unit 7, through the logic element OR 10 and the switch 12 of the sub-55 connects the output of the position regulator 14.

At this point in time, the control storage unit 23 stores

the position of the support of the guide rollers at the command of its control input, received from the control block 17.

The memorized value of the position of the support of the guide rollers 3 is compared in the comparator 22 with the position of the guide rollers corresponding to the zero value of the angle of entry of the strip into the cage.

 If the difference is positive, the third key 19 is opened, and a reference signal from the direct output of the input angle increment calculator 16 is received to the input of the controller 14 of the guide roller support position. strips in rolls. If the difference is negative, the fourth key 20 is released and the reference signal from the inverse output of the unit 16 for calculating the increment of the angle of entry of the strip to the rolls is sent to the input of the regulator 14 of the position of the support for the guide rollers.

Thus, at one input of the regulator 14 there is a signal proportional to the required additional movement of the roller support, and at the other - a signal proportional to the actual displacement. The latter is removed from the output of the controlled displacement meter 13. At the beginning of the 1st positioning moment, it is zero. The actuator 4 is engaged and moves the rollers 3 mounted in front of the cage to the desired value. When the specified movement becomes equal to the actual, the actuator 4 is turned off.

/ After the termination of the second time delay 2, which takes into account the time of passage of the seam section through the deformation zone, a logic zero signal appears at the output of the control unit 17. Key 12 closes and key 11 opens. The drive control unit 5 is connected via OR 10 and the key 11 to the output of the moment comparison unit 7 on the spindles of the work rolls of the stand.

Drive 4 sets rollers 3 to a position where

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ts

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moments on the spindle x work rolls become the same.

Similarly, the device is triggered when a portion of the weld is passing through all the stands.

The device can be used on continuous and reverse cold rolling mills. In the latter case, guide rollers with a drive for moving the supports by the drive control system and sensors are installed in front of and behind the cage.

The amount of additional change in the angle of entry of the strip, which is specified by the control unit 5 of the drive 4, is calculated in one block 16 for calculating the increment of the angle of entry of the strip to the rolls for each pass. For this, the device must use information about the thickness of the strip in front of and behind the cage in each aisle.

The use of the device will make it possible to increase the reliability of the mill by reducing the number of strips by moving the directions of the rollers in the direction of reducing the tension of the strip during the passage of the weld.

Due to this, additionally, in comparison with the basic invention, the consumption of mill rolls will decrease, the amount of downtime will decrease, and consequently, the productivity of the rolling mill will increase.

An additional efficiency of the device proposed is that it allows to reduce the consumption of materials and increase the speed of the drive for moving the supports for the search for rollers. This is achieved by the fact that, in the proposed device, the vertical component of the strip tension, unlike the known one, is always an active force directed towards the necessary additional movement of the roller supports. Therefore, an installation (nominal) power of the movement mechanism and its drive is required, and, therefore, the consumption of materials can be reduced.

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Claims (1)

DEVICE FOR REGULATING THE ANGLE OF ENTRANCE OF THE STRIP IN THE CAGE OF A CONTINUOUS · ROLLING MILL by ed. St. No. 1026871, characterized in that, in order to increase the reliability of the mill by reducing the number of gusts of strips, it additionally contains a second logical OR element, a third and fourth key, a second inverter, a comparator and a controllable storage unit, while the sensor output the position of the support of the guide rollers is additionally connected to the input of the controlled storage unit, the control input of which is connected to the output of the control unit, and the output through the comparator is connected to the control inputs of the third key and through the inverter is connected to the control input of the fourth key, the direct and inverse outputs of the block for calculating the increment of the input angle g of the strip, respectively, through the third and fourth keys and the second logical element OR connected to the input of the position controller of the roller bearings. eleven