SU595024A1 - Apparatus for controlling operating speed modes of continuous hot-rolling mill - Google Patents

Description

reduction of rolling end temperature and strip thickness.

The purpose of the invention is to ensure that the PA leaves the mill at a given speed and eliminates exceeding the maximum allowable filling speed in the last stand.

This is because the device additionally introduces a correction adder, a node for maintaining a given rolling speed, containing an adder, a multiplier, an integrator, a reference element, an integrator, and a refueling speed restriction node, containing a setting controller, a comparison element, a rectifier, an integrator, a capture relay. strip, and the output of the correction adder is connected to a pinch of the reference voltage of the filling speed, and its inputs are connected to the output of the setting unit for the filling speed, the integrato output A node for maintaining a given rolling speed, the input of which is connected to the output of a comparison element of this node, and the inputs of this comparison element are connected to the output of a speed sensor for a post drive and an intensity generator, the input of which is connected to the output of a multiplier for the rolling speed speed control, the first input of which is connected with the output of the unit for setting the individual speed of the last stand, and the second input - with the output of the adder of the node supporting the specified rolling speed, the first input of which is connected and with the reference voltage bus of the working speed, and the second with the output of the filling speed setting unit and the third input of the correction adder is connected to the output of the filling speed limiting node integrator, the output terminals of this integrator are connected via a strip pickup contact and its input the driver is connected to the output of the comparison element of the limiting speed limit node, the inputs of which are connected to the output of the speed sensor for the drive of the last stand and the output of the setting unit of the filling restriction node the first speed.

The drawing shows a block diagram of the proposed device.

It contains the rolled strip 1, the rolls 2 rolling stands, the looper roller 3, the looper position adjuster 4. The 4 position regulator of the ptederder is connected with the speed controller 5 along the circuit 6. Through the chain 7, the speed controller 5 is connected with the position adjusters of the loops of the adjacent intercellular gaps. Operational multipliers 8 are also connected to the speed regulators 5, the inputs of which are connected to the output of the individual speed setting units 9 with the output of the adders 10. The inputs 11, 12 of the reference voltage and operating speeds common to all the cages are connected to the inputs of the adders 10 . The reference voltage bus 11 of the refueling speed is connected to the output of the reference voltage correction voltage adder 13. Stress to maximum 12 reference voltages

the working speed is formed by the working speed setting unit 14. Bus 12 to adders 10 is connected via individual braking keys 15. In addition, the device comprises a unit 16, which checks the predetermined rolling speed at the mill output, regardless of the operation of the automatic tension control system, and the limiting speed limit unit 17 at the maximum allowable level. Node 16 consists of

an adder 18, an anionic multiplier 19, an intensity setter 20, a comparator element 21 and an integrator 22. The inputs of the adder 18 are connected to the bus 12 of the reference voltage of the operating speed via a switch 15

and the output of the setpoint 23 overseas speed. The output of the adder 18 is turned on} ia input of the multiplier 19. The second input of the multiplier is connected with the output of the unit 9 for setting the speed of the last stand. At the exit of the adversary 19, an intensity adjuster 20 is installed, which is intended to equalize and transmit the fuction of the main drive channel of the last stand and node 16. The inputs of the comparison element 21 are connected to the output

master 20 intensity and sensor 24 speed and the last stand. The output of the comparison element 21 is connected to the input of the integrator 22. The output of the integrator 22 is the output of the node 16. The node 17 consists of a setpoint 25

the maximum allowable filling speed, the comparison element 26, rectifier 27, integrator 28, which is bridged by contact 29 of the strip capture relay. The dial 25 is connected to the input of the reference element 26.

The second input of the reference element is connected to the output of the sensor 24 of the speed of the post stand. The output of the comparative element 26 through the rectifier 27 is connected to the input of the integrator 28. The output of the integrator 28 is the output

node 17. The output signals of the nodes 16 and 17, as well as the master 23 of the charging speed, are summed at the adder 13 of the reference voltage correction at the reference speed. The output of the adder 13 correction connects the bus 11 reference voltage voltage filling.

The device works in the following way. In accordance with the rolling program, the specified stand speeds are set, the filling and cocking speeds of the rolling speed, the specified acceleration, the maximum permissible rolling speed are set. But as the entrance of the metal in the cage closes the keys 15 individual braking. Reference voltages and operating speeds are summed at the entrance to the speed control circuit of each stand on the adders 10. The rotational speeds of the rolls of the stands are coordinated using contactless multipliers 8.

Multipliers 8 perform the operando shuffling of two voltages. The first factor is the sum of the two reference voltages. The second factor is individual for each stand. The output voltage of the multiplier 8 at a certain scale represents a given value of the speed of this stand and is fed to the input of the speed controller 5.

The signal at the output of the multiplier 19 is the speed setpoint at the output of the finishing group. If the rolling speed measured by speed sensor 24 is different from the set, due to the auto tension control system, a signal appears at the output of the comparison element 21, which through the intensity setter 20 and the integrator 22 changes the filling speed of the finishing group until until the output speed is equal to the specified one. If, when the auto tension control system is in operation before the winder catches the strip, the rolling speed exceeds the maximum allowable value set by the setting device 25, the output of element 26 is a signal which, via rectifier 27 and integrator 28, reduces the overall level of filling speed. After capturing the nolosa with the winder, integrator 28 is shunted by pin 29.

Claims (2)

1. USSR author's certificate No. 242260, cl. B 21B 37/00, 1968. 2. Druzhinin P.P. Continuous mills as an object of automation. M., “Metallurgists, 1975, p. 242. about - sixteen 7, I L.