SU662179A2 - Apparatus for strip temperature regulation during rolling - Google Patents

Description

(54) DEVICE FOR REGULATING THE STRIP TEMPERATURE IN THE ROLLING PROCESS

d (logic block is connected to each of the additional keys, the first one is the output of the first nullorgan, and the second one is at the output of the second nullOrgan, and the outputs of both keys are connected 5 to the inputs of two keys of the main channel uravravlya THI THIS sko {rotJtlfgrollee connected to the inputs of the second rOGB zero-organ, the output of which is connected to the input of the second additional key.

The drawing shows a block diagram of a device consisting of a setting device 1 of the output thickness of the setting unit 2 of the strip temperature behind the last stand of the finishing group, the setting unit 3 of the maximum LBYO possible mill acceleration, the sensor 4 of the actual speed of the strip behind the last finishing stand, the sensor 5 of the actual temperature of the strip output of the mill, the zero-organ 6, keys 7 and 8, the integrated storage device 9, the computing unit 20 10, the setting knob of the mill acceleration intensity, and the regulators 12 sk: the characteristics of the mill drives, cat outputs ryh are device outputs. The device also contains a sensor 13 of the presence of metal in the last rolling stand, a logic unit 14, keys 15 and 16, a setpoint adjuster 17 of the final speed and a second null organ 18.

The outputs of the metal presence sensor 13, the actual speed sensor 4, the unit for thickness of the strip and the actual temperature sensor 5 are connected to logic unit 14. The output of unit 14 is connected to key 15 of the zero control circuit output 6 of the main control channel, the operation of which is described above. The second output of the block 14 is connected to the key 16 of the zero-body 18 dopl ™ of the program channel established in the output circuit 35 of the program-channel formed by the block 14 and interconnected nodes. At the same time to the inputs of the null-Organ 18 is connected to the outputs of the knob 17 final speed, when. where the predetermined rolling end temperature is reached, and the actual speed sensor 4. The output of the zero-organ 18 through the key 16 is connected to the key 7 in the output circuit of the sensor 4 of the actual SCHRBTY and with the key 8 in the circuit of the setpoint 3 of maximum 45 acceleration.

The device works as follows.

After capturing the strip with a winder (or, FCjttf tO, possibly after the strip 50 leaves the mill), if the actual temperature of the strip is smaller than the specified one, the keys “O” will be sent to the keys 7 and 8 from the zero-organ 6 via the switch 15, the sensor 4 and the integrated memory device 9, and the key 8 closes 55 chains between setpoint 3 of the maximum possible acceleration and setpoint 11 of the intense acceleration of the mill. The signal from setpoint 3, transformed, is fed to the speed controller 12 of the main drives, and the mill accelerates at the maximum possible speed for these conditions.

In the process of acceleration, the temperature of the strip at the output of the mill increases, and at the moment of equal temperatures between the set and the actual zero-body 6, the keys 7 and 8 receive the signal "1, which closes the key 8 and opens the key 7.

The signal coming from the sensor 4, through the integrated memory device 9, is fed to the computing unit 10. The signal from the strip thickness from the thickness setting 1 is also supplied to the computing unit 10, and other signals from the sensors and setting units can also be switched on depending on the algorithm adopted.

After a predetermined time has elapsed, the key 7 is closed, and a signal proportional to the actual speed is memorized. Computing unit 10 calculates the acceleration required to stabilize the set temperature of the strip according to the received algorithm. The calculated value of the acceleration of temperature stabilization of the strip from the computing unit 10 enters the unit 11 of the acceleration intensity of the mill, and the mill continues to accelerate with the acceleration of stabilization of the temperature reached. At the end of the rolling process, the device is automatically reset. The logic block 14, additionally entered, analyzing the input signals from the metal presence sensors 13 in the last stand, the sensor 4 of the actual speed, the strip thickness setting device 1 and the actual temperature sensor 5, determines the normal operation of the strip temperature sensor 5 at the output of the mill, and if it fails, it gives out switching signals to the keys 15 and 16 in the output circuits of the zero-bodies 6 and 18, and the key 15 in the output circuit of the zero-organ 6 of the main control channel breaks the circuits, and the key 16 in the output circuit of the zero-organ 18 ADDITIONAL channel control circuit closes. In this case, switching the mode of intensive acceleration of the mill with the maximum possible acceleration is performed by a signal from the null organ 18 of the additional channel by switching keys 7 and 8 when the rolling speed reaches the specified rolling end temperature and is defined by the following relationship

/ - T ° KP-18-4.4.35b-Y.ZgUz-O.8bTn-43.5a. S, 65

where VK is the final rolling speed with slow acceleration, m / s;

h - thickness of the strip at the outlet of the mill, mm ;. .

Vs - filling speed of rolling in the last stand, m / s;

TH is the average temperature of the rolled at the exit of the draft group, C °;

Tkp - set temperature of the end of rolling, ° С;

and - acceleration of rolling in the last stand,

187 degrees;

44.35 - degrees / mm

2.32 - deg / m

0.386

43.5 degrees / m / (, 8.

10.65 degrees / m / 5

The signals corresponding to the speed are fed to the inputs of the zero-body 18 from the sensor 4 of the actual speed and the unit 17 of speed, equivalent to the set temperature of the end of rolling. When the temperature sensor 5 is restored by signals from the logic device 14, it is switched back to the main (main) channel, control. Verification of the actual temperature sensor 5 is performed every cycle.

Similarly, other most important sensors and rear sensors with switching devices (systems) can be checked. The proposed device is developed and implemented in the system of control of the temperature and speed mode of rolling. .

Claims (1)

1. USSR author's certificate No. 518243, cl. At 21 At 37/10, 08.02.76.