SU1271600A1 - Apparatus for automatic measuring of rolling mill speed - Google Patents

Abstract

The invention relates to the field of rolling mill automation and can be used to measure the frequency of rotation of a drive motor and the linear speed of a roll of a rolling mill. The purpose of the invention is to improve the quality of rolling mill products by increasing the accuracy and reliability of the device. The essence of the invention is that during the rolling process the signal from the pulse speed sensor 1 is supplied to the inputs of dividers 2 and 3 frequencies, the signals from which are fed to the first counter 4 and the controlled frequency splitter 6, respectively. The frequency of rotation is determined by the formula p -1 / K, where f is the frequency of the pulses from sensor 1, t is the specified length of time of measurement, K is a constant coefficient. The linear speed of the roll is determined by the formula: V It- VP / 60, where D is the diameter of the roll. To measure the linear speed of the SP (L use frequency divider 3, controlled frequency divider 6, node 11 for setting the frequency division factor, counter 7, memory register 8, and display unit 10. 1 Il.

Description

fI The invention relates to instrumentation and rolling production, can be used to measure the rotational speed of a drive motor and the linear speed of a roll of a rolling mill. The aim of the invention is to improve the quality of rolling mill products by increasing the accuracy and reliability of the device. The drawing shows a block diagram of the device. The device contains a frequency-pulse speed sensor 1, connected to the inputs of the first 2 and second 3 Frequency Dividers, the first counter 4, the input of which is connected to the output of the first frequency divider 2, and the output - to the input of the first memory register 5, controlled by the frequency divider 6 The input of which is connected to the output of the second frequency divider 3, the second counter 7, the counting input of which is connected to the output of the controlled frequency divider 6, and the output - to the input of the second memory register 8, the first display unit 9 whose input is connected to the output of the first register memory path 5, the second display unit 10, whose input is connected to the output of the second memory register 8; a time mark generator .11, the output of which is connected to the control inputs of the first 5 and second 8 memory registers and through the inverter 12 with the input of the one-oscillator 13, the output of the latter is connected to the control inputs of the first 4 and second 7 counters, the division task 14. frequency, the output of which is connected to the control input of a controlled divider of 6 h & h. The device works as follows. The signal from the frequency-impulse sensor 1. speed is fed to the inputs of dividers 2 and 3 frequencies. From the first frequency divider 2, the signal arrives at the counting input of the first counter 4. From the second frequency divider 3, the signal arrives at the input of the controlled frequency body 6, where the frequency of the signal is divided by the coefficient specified by the frequency division ratio setting unit 14. The splitter factor 2 frequency is chosen so that the number of pulses calculated by the first counter 4 for a given period of time is expressed in the same figures as the measured engine speed. The number of pulses N coming from speed sensor 1 over a period of time t is determined by: N f, - t, where f is the frequency of the pulses coming from the speed sensor; t is the specified measurement time interval. Rotation frequency N f kg - 7 К / where К 1-, For example. If the speed sensor gives 600 pulses per revolution, then N 6000 pulses will arrive at a speed of 600 rpm (10 rps) from the sensor, while measuring rotational speeds (rpm) K factor - n 600 Then the division factor of the first divider 2 K 10 The time interval t for which counter 4 counts the pulses can be chosen over a wide time interval depending on the required accuracy. This length of time is set by the generator 11 timestamps. A short impulse from the time stamp generator 1 is fed to the control input of the memory register 5, the recording of the information with. counter 4, the decay of the time stamp to the output of the generator through the inverter 12 triggers a one-shot 13, producing a short pulse (with a duration much shorter than the pulse from the speed sensor), which zeroes the counter 4, which starts counting the input pulses with zero, later the cycle repeats. When the next pulse of the time stamp from the generator 11 arrives at the control input of the register 5 of the memory 11, the information in it is updated and t, e. Thus, the measurement is carried out for a specified period of time. A linear frequency velocity measurement of the roll uses a frequency divider 3, a controlled frequency divider 6, a coefficient setting, frequency division node 14, a counter 7, a memory register 8, and a display unit 10.

The linear speed of the roll (circumferential speed) is determined from the expression

.n

V

D is the diameter of the mill roll; i - gear ratio of the reducer through which the mill rolls are connected to the drive motor

or

V

F 60

K, YK. -Consuming what they get

To

or v

TO,

K e.

  .

TO,

Where

The coefficient Kj is set by the divider 3 of the frequency and is chosen so that the counted number of pulses by the counter 7 for a given period of time would be expressed by the same figures as the measured linear speed of the roll. The coefficient K is defined by the node 14 setting the frequency division factor. Node 14 is equipped with software switches with which the operator enters numerical values K in the device.

For example, when t 1 s, the sensor. speed, resulting in 600 pulses per revolution, gear ratio of the reduction gear, mill roll diameter, 25 m, the value, linear speed at rpm is 7.85 m / s.

The operation of the counter 7, the memory register 8, the display unit 10 is similar to that described by the component nodes when measuring the rotational speed.

The display units 9 and 10 display the measurement results of the rotational speed and the linear speed, respectively.

Thus, the device simultaneously measures and indicates the rotational speed of the drive motor and the linear speed of the roll.

rolling mill, which allows you to more accurately comply with the technological regimes during rolling, as well as to reduce the setup time of the mill 5 after transshipment.

In the proposed device, there are no high requirements for the technical parameters of the speed sensor, the change in the pulse ratio of the pulses does not affect the accuracy of the speed measurement. In addition, the effect of a single noise induced on the communication line connecting the speed sensor and the rest of the device is not

15 leads to a significant measurement error. For example, when the sensor shaft rotates at a frequency of 600 rpm and 60 impulses of impulses of noise per second are directed to the communication line,

0 measurement error 1%. Thus, the device allows the use of a simpler and less expensive frequency pulse speed sensor, which makes the device more reliable

5 overall.

The use of the device on the finishing group of the stands of a small section mill makes it possible to improve the quality of heat-treated rolled metal. .

0

Claims (1)

. Invention Formula Device for automatically measuring rolling speed 5 mill, containing a frequency-pulse speed sensor connected to the inputs of two divider chastodty, the first counter, the input of which is connected to the output of the first frequency divider, 0 and the output is connected to the input of the first memory register, the controlled frequency divider whose input is connected to the output of the second frequency divider, the second counter, the counting input of which is connected to the output of the controlled frequency divider, and the output to the input of the second memory register , the first display unit, whose input is connected to the output of the first memory register, 0 a second display unit, the input of which is connected to the output of a second memory register, characterized in that, in order to improve the quality of rolling mill products, 5 increases the accuracy and reliability of the device; it additionally contains a time stamp generator, an inverter, a one-shot and a setpoint factor S1271600b frequency division, with the general control inputs of the counters, and the timestamp marker connected to the output of the coefficient setting node by the unloading inputs of the frequency memory registers connected to the controller through an inverter to the input of the one-time input of the controlled chasor divider, the output of the latter is connected to 5 tons.