SU977079A1 - Assembly for tracking and limiting mechanism path in blooming mill manipulator guard control automatic system - Google Patents

Description

(54) KNOT OF TRACKING AND LIMITATIONS OF THE PATH OF THE MECHANISM IN THE AUTOMATIC CONTROL SYSTEM OF THE RULES OF BLUMING MANIPULATORS

one,

This invention relates to automatic control and can be used in position control circuits.

A known system of automatic control of the ruler of the manipulator and turner of the blooming 1300 of the West Siberian Metallurgical Plant, is made on the magnetic logic elements of the LT series (1).

The disadvantage of the system is the impossibility of its use in a high-speed thyristor electric drive.

Closest to the proposed by. The technical entity is the node for tracking and limiting the path of the mechanism in the automatic control system of the blooming manipulators rulers, containing the following selsyns on the shaft of the mechanism of both rulers, phase-sensitive rectifiers, operational amplifiers, functional, transducers, functional transducers, adjustable limiters, intensity controllers and contact relays 2.

The disadvantages of this technical solution are the use of electromagnetic relays to switch the direction of movement, lack of reliability.

The purpose of the invention is to improve the reliability of the tracking unit and limit

  paths mechanism.

The goal is achieved by the fact that in the node of tracking and limiting the path of the mechanism in the automatic control system of the rulers of manipulators of blooming, containing. the selsyn sensor on the shaft of the mechanism and the phase rectifier device, the OUTPUTS of the selsyn sensors are connected via phase rectifier devices to the inputs of the first amplifiers of both channels: catch The second INPUTS of these amplifiers are connected to the outputs of phase-rectifying devices of opposite channels, the inputs of the second amplifiers are connected to the first inputs of the first amplifiers, the second output of the second amplifier of each channel is connected to - INPUT of the integrator, the output of which is connected to the second output of the first amplifier, In the feedback of the integrating device, serially connected diodes and resistors are counter-parallelly inserted, with the first outputs of the spruces connected to the connection points of the diodes and resistors.

The drawing shows the functional layout of the tracking node.

The tracking unit includes selsins-sensors 1 of the automatic control system of the left and right rulers (shooting database BD 501 A) phase wiring devices 2, control forces 3 and 4, integrator control device 5, diode-resistor circuit b, potentiometers 7 and 8. .

The selsins-sensors 1 of the left, and the right-hand nepe manipulator of the blooming phase-connecting devices 2 are connected to the inputs of adjustable amplifiers 3 and 4 with a unipolar relay characteristic of their own and opposite line, the outputs of which are connected to the feedback circuit of the integrating-setting devices 5 through a diode -resistor circuits 6. Through potentiometers 7 and 8, amplifiers 3 and 4 are connected to devices 2.. ,

The device works (as follows. OM.,.

In the case of oncoming movement of the rulers, the output signals from the selsyn sensors 1 enter the control system through phase-shifting devices and are compared at the input of the amplifiers 3, At the same time, the voltage of the amplifiers 3 serves as the positive voltage of the positive field in the feedback circuit of the connectors and their mouths. ) 5. As long as this voltage is present, the IZU acts as Settlement Intensity, generates a reference signal in the control system, in the absence of an output signal from the amplifiers, 3 the reference voltage in the IZ feedback is used ezaet, DRI 5 zakorachivayuts and Adan of the channel control is removed. In the actual circuit, at the input of the amplifiers 3, another dd / yunnel signal is provided for the offset - oY potenmeters. This signal is proportional to the minimum allowable distance between the rulers and is taken to be equal to Dili somewhat less) - the minimum width of the blanks rolled in the mill:;.,

Limiting the stroke in

The working positions are performed with the help of other amplifiers 4, which absorb the reference voltage of the negative polarity in the feedback circuit of the IZU. At the input of these amplifiers 4, the following two signals are compared: alternating voltage of negative polarity from the selsiniath sensor on the shaft of its own rulers and the bias voltage of the positive polarity from the power supply through potentiometer 8. The magnitude of this signal is equal to the maximum voltage of the selsyn sensor, i.e. that voltage, which is generated by the agricultural sensor when moving the rulers to the extreme working position.

The resulting signal at the input of amplifiers 4 can be either incriminating or p, which is zero. In the first case, the output signal of amplifiers 4 forms a negative polarity reference voltage in the feedback circuit of the IGN, in the second case, i.e. signals at the input of amplifiers 4, which occurs when the neyks have reached the extreme working position, the IZS is short-circuited, the job on the IZU output is removed and the drive stops. -

Consider the operation of the circuit under real operating conditions.

Assume that a positive polarity signal is applied to the input of both control systems, defining a command to move the right and left rulers in opposite directions. The following signals are compared at the input of amplifiers 3 of both systems: negative from the selsyn-Gauge ruler, on its side (for example, the left ruler, if the convergence occurs on the side left of the roll axis); positively from the selsyn-sensor rulers, which are on another side (for example, right rulers, its-, whether convergence occurs on the left side); a positive displacement across across / tentsiol etra 7 from a constant power source. .

Regardless of which side fia moves the resulting signal at the input of the amplifiers 3 of both systems. The memory is either a negative value or equal to zero, the latter occurs when the negative signal from the sensor of one sensor is equal to the sum of the signals of the bias and the positive signal from the other. selsyn-sensor, t-, e. when the distance between the rulers has reached the minimum specified value. As long as the resultant negative voltage is present at the input of amplifiers 3, the amplifiers are open and the positive signal that is inverted at their output serves as a reference voltage in the feedback of the IZU. A close command is given to the input of the integro-master device 5 (the signal "+ polarity is locked in feedback by IZU 5 with positive reference voltage and IZU. They function, in the usual setting mode, the intensity; SIGNESS.,

When the input voltages of the amplifiers 3 become zero, the amplifiers record.

and the reference voltage in the feedback circuit of the IZU is removed, the IZU is short-circuited. Through the internal resistance of the Wuxi,: switches 3, and the voltage in the control channel is released, the drive brakes

maximum dynamic current. Thus, having reached the limitation on the minimum distance between the rulers, the system does not respond to the proximity command (“+, at the input of the CCD).

The removal of the restriction is achieved without additional devices, by simply changing the polarity of the control commay, s, i.e., replacing the command. The command for diverging lines is determined by applying a negative signal to the IGN input, which, however, cannot be passed through the IGU feedback, due to the presence of diodes in KOfjuype 6. IZU begins to act in its main function, producing a signal of tasks. Thus, while the signal of positive polarity (at the approach of the rulers) passes through the control channel, the work of the displacement mechanism is provided.

It is easy to see that the drives of both pairs of lines will be removed: from the limitation when changing commands in one of the control systems, while ensuring the possibility of any modes of separate and coordinated movement. .

The scheme continues to function in full compliance with the description given and in particular cases, when the rulers are arranged symmetrically with respect to the rolling axis, or when one pair of lines is located along the axial rolling line. Until the distance between the rulers is pre. the minimum setpoint is higher, in the output circuit of the amplifiers 3 and the feedback of the IZU a positive reference voltage acts; as soon as the distance reaches a minimum, the reference voltage is removed, the drives of both rulers brake.

When a system is fed to the input of a command to accumulate lines, expressed by a negative polarity signal., A set of signals acting at the input of amplifiers

3 and 4 is the same as when the team on the rapprochement;

 The resulting signal at the input of amplifiers 3 has a negative value and, in feedback, generates a reference voltage of positive polarity. The resulting signal at the input of the amplifiers

4 has a positive value and, in feedback, creates a negative negative polarity reference voltage acting along the entire path of moving the rulers to the extreme position. - FTpVi reaching the lines of the extreme working position, result-. the output signal at the output of amplifiers 4 becomes zero, the reference voltage in its circuit is removed, the SPLI is short-circuited and the drive stops. The removal of the IZU from the restriction is provided without additional bills; -the lines by giving the command to the reverse, in this case, the oncoming traffic, which is fed to the input.

Due to the diode in the output circuit of the amplifiers 4, the IZU does not pass through; IZU operates in its main function, producing a reference signal. So at that time,

,, as a signal of negative polarity (on the divergence of the lines) was. locked, the signal of positive polarity (on the approach of the rulers) passes, ensuring the movement of the mechanism. The scheme can also be used in the system, max, the control of other mechanisms having displacement in two opposite directions of these movements.

The proposed device makes it possible to increase the reliability of operation due to the fact that it provides the generation of commands for accelerating and braking the drive automatically; Depending on the actual spatial position of the mechanisms. regardless of possible erroneous commands, as well, thanks. that the directions of movement of the mechanisms are switched non-contact.

Claims (2)

. Invention Formula     . The tracking and limiting unit path of the mechanism in the automatic control system for the rulers of blooming blooms, containing in the every channel of the system Controlling the left and right rulers with its device, two adjustable amplifiers with a uni-polar relay characteristic, the following selsyn sensor on the shaft of anism and phase-rectifying. A device, characterized in that, in order to increase reliability, the outputs of the selnsynovators are connected — via phase-rectifying devices to the inputs of the first amplifiers of both channels;) 10c, the second inputs of these amplifiers are connected to the outputs of fa-i Zo-rectifying devices of opposite channels, the input of second amplifiers are connected to the first inputs of the first amplifiers, and the output of the second amplifier of each channel is connected to the input of an integrating device, whose input is connected to the second output of the first amplifier, In parallel, serially connected diodes and resistors are introduced; r | rchem; first outputs are connected to the points of connection of diodes and resistors; amplifiers. Sources of information taken into account in the examination of 1.-Electric drive and automation of blooming 1300 West-Siberian Metallurgical Plant. VNIIelektroprivod, Technical project OLA.082707,1967. - 2. Electric drive of adjustable mechanisms of blooming 1500 Nizhne-Tagil Metallurgical Plant, SO GPI TPEP, t. 3-1, c. one; 1973 ..