SU1178771A1 - Device for monitoring parameters of molten metal in metallurgical space - Google Patents

Abstract

DIGITAL CONTROL DEVICE OF OXYGEN TURNMENT POSITION, containing two angular displacement sensors, a counter whose output is connected to the input of a communication unit with a computer, a command unit, a correction unit, a signal quadruple unit and a direction determining unit, different in that an oxygen tuyere, a strobe restraint, three opto-isolator and signal shaping units, a clock pulse generator, a reference register, a reference sensor, two synchronization units, an And and a log are entered into the device. an AND-OR block, the first input of the I-IL logic unit connected to the output of the first node of the optocoupler and generating a signal whose input is connected to the output of the first angular displacement sensor, the second input of the logical block AND-OR is connected to the output of the second node of the optocoupler signal and forming the input of which is connected to the output of the second angular displacement sensor, the reverse output of the logical block AND-OR is connected to the input of the reverse of the counter, and the counting output of the logical block AND-OR is connected to the first input of the transducer The first synchronization block is connected to the first output of the clock generator, the third input of the first synchronization block is connected by a common point to the input bus of the Interrogation and the first input of the second synchronization block, the second input of which is connected with the second output of the clock pulse generator, the third one (L input of the second synchronization unit is connected to the output of the third node of the optocoupler and generating a signal whose input is connected to the output And the first input of which is connected to the output of the reference sensor, the second input of the AND output is connected to the Commander’s output, 00 whose input is mechanically connected to the –h axis of the strobe cylinder, and the output of the second 5th synchronization unit is connected to the input. the number of which is connected to the output of the reference register, the command device is located in the same housing with the sensors, the strob stickshield is made with the reference slot, the angular distance between the sensors of the angular displacement is Ht-t- where N is the number of steps i metafed lindra, and the angular distance of the reference sensor is equal-Y. first or second sensor; for angular displacement, where-i- - |

Description

one

The invention relates to a measurement technique for controlling the smelting process in the ferrous metallurgy and can be used in systems for monitoring and controlling the position of an oxygen tuyere.

The purpose of the image1) is to increase the accuracy of control and position of the oxygen tuyere by increasing the accuracy of the input correction and reading information of the computer.

The device performs separate synchronization of information counting pulses from the sensors of angular movements of the tuyere and pulses of the reference sensor, thereby eliminating the coincidence of the moment in the counter while simultaneously introducing correction and counting of information pulses, as well as storing information from the sensors in the synchronization blocks and prohibiting it from passing to the counter in the time of arrival of the impulse Poll from the local system or from a computer, which eliminates the reading of distorted information from the output of the counter caused by transients in it. Gating signal from the output of the reference sensor (pulse shorter) c. a signal (a pulse of greater duration) of the command device increases the accuracy of the correction input, the command device is placed in the same housing with the sensors and mechanically connected with the axis of the stroblinder, and the slide wheel is made in the form of a stroblinder, which excludes the effect of the backlash and beats of the stroblinder axis on the duration and period from following of impulses from sensors. FIG. 1 shows the functional scheme of the device; in fig. 2 and 3 are timing diagrams illustrating the operation of the device; in fig. 4 is a diagram of an AND-OR logic unit; in fig. 5 is a diagram of synchronization blocks i.

A digital control unit for the position of an oxygen tuyere contains an AND-OR logic unit 1, the first input of which is connected to the output of the first node 2 of optical isolation and forming a signal, the input of which is connected to the output of the first angular displacement sensor 3, the second input of the logic unit AND-OR 1

dinene with the output of the second node 4 optocoupler and forming a signal, the input of which is connected to the output of the second sensor 5 of the angular displacement, and the reverse output of the logical block AND-OR 1 is connected to the input of the reverse of the counter 6, and the counting output of the logical block AND-OR 1 connected to the first entrance

The first synchronization unit 7, the output of which is connected to the counting input of the counter 6, the second input of the first synchronization unit is connected to the first generator output of 8 clocks, the third input of the first synchronization unit 7 is connected to a common point with the input bus Polling 9 and the first input of the second synchronization unit 10, second

the input of which is connected to the second output of the generator 8 clock pulses, the third input of the second synchronization unit 10 is connected to the output of the third node 11 of the optocoupler and signal generation,

the input of which is connected to the output of the circuit 12, the first input of which is connected to the output of the reference sensor 13, the second input of the circuit 12 and connected to the output of the controller 14, the input of which is mechanically connected to the axis of the strobe cylinder 15, and the output of the second synchronization unit 10 is connected to the input Record the number of the counter 6, the input The input of the number of which is connected to the output of the reference register 16, and the output of the counter 4 is connected to the input of the communication unit 17 with the computer.

The rotary wheel is made in the form of a strobe cylinder 15, on which rectangular slots and calculating teeth are cut. This allows you to receive (shape) pulses with

a uniform follow-up period, thereby simplifying the installation of sensors and their adjustment, which cannot be obtained using a gear in the prototype, especially with a small

diameter; The teeth are rectangular, the slits are trapezoidal, which reduces the reliability and accuracy of the device, complicates the installation and deposition of sensors under production conditions.

For the reference sensor 13, one slot 18 is cut through the strobe cylinder 15 so that with one

The rotation of the strobe cylinder 15, the reference sensor 13, gave one information pulse. On the other hand, replacing the cogwheel with a strobe cylinder allows positioning of the angular displacement sensors and the reference sensor along the entire perimeter of the pitch circle of the strobe cylinder. The teeth and the slots on the strobe cylinder are equal to each other, which makes the pitch of the teeth t const, and the placement of the angular displacement sensors can be any if the conditions are met. Nt-b ;, where N is the number of steps between the sensors of angular displacements, which is a positive integer, and in the particular case. May be zero.

The value - | - corresponds to the value at which the accommodation capacity of the strobocylinder increases 4 times and which gives a uniform period of working impulses and significantly simplifies the installation of sensors and device setup, and also increases the accuracy of the logical block IL-1 (when the input signal is quadrupled) .

The third sensor 13 of the reference point can be installed (from the sensors of angular displacements) along the entire perimeter of the pitch circle of the strobe cylinder at the angular distance Nt + g + K, where the value K 4

is selected within a

t

Q is the boundary determined by the minimum allowable separation time of the reference pulse (sensor repernrg) and counting information pulses (angular displacement sensors).

The device works as follows.

Each sensor 3, 5 and 13 is a pair consisting of an infrared LED and a silicon photodiode, between which there are slots of the strobe cylinder 15. When the strobe cylinder 15 is rotated, the modulation of the infrared radiation occurs. Modulated flux illuminates silicon photodiodes. The signals from the outputs of sensors 3 and 5 are fed to the inputs of nodes 2 and 4 of optocoupler decoupling and formation, where galvanic isolation and the formation of rectangular pulses occur using Schmitt triggers (see Fig. 2 a, b). On each front of the rectangular pulses (Fig. 2 a, b), information workers are formed) pulses counting the position of the oxygen tuyere (Fig. 2 c, d), which arrive at

the inputs of the logical block AND-OR 1, where fourfold (o.connecting) are quadrupled (see FIG. 4) and four working impulses are formed at its output (FIG. 2D) when the strobe cylinder 15 is moved one step t.

Consequently, four pulses are taken from the pulse output of the logical block AND-OR 1 with a single displacement of the strobe cylinder 15, which, having passed the synchronization block 7, where they are synchronized with the pulses of the clock generator 8, are fed to the counting input of the counter 6.

The logical block AND-OR 1 also determines the sign (direction) of rotation of the strobe cylinder 15. The sign signal from the reverse output of the logical block AND-OR 1 is supplied

at the entrance of the reverse. counter 6.

Synchronization blocks 7 and 10 (see Fig. 5) are designed to separate in time the counting pulses coming from the pulse output of the INSHI logic unit 1 and the reference input correction pulses formed at the output of the third node 11 of the optocoupler and form a signal to the counter 6. This separation is due to the synchronization of the counting pulses and reper pulses in blocks 7 and 10 of synchronization with the pulses of the clock frequency generator shifted relative to each other in time.

Block (7, 10) synchronization works as follows (see Fig.5). Positioning information pulse

the tuyere sets the first trigger (Tr1) to the single state,. the unit output of which passes through the first circuit (and 1) the clock pulse from the clock generator 8, which translates the second trigger (Tr2) also into the unit state, the unit output of which via the second circuit (II)

passes the next synchronization pulse to the output of the synchronization block, which, through delay F, sets the first and second triggers to zero (initial) state. Then the cycle repeats.

When information is read by the local system or computer, the first circuit AND synchronization block (see Fig. 5) receives a Polling signal, which prevents the further passage of clock pulses from the generator 8 clock pulses through the first AND circuit, with a single state of the first trigger, which remembers the information pulse about the position of the tuyere, thereby excluding the loss of information when reading. After the termination of the signal, the interrogation opens the first And and syncj pulse from the clock generator passes further in the same way as above.

Counter 6 counts the information pulses in the form of a parallel binary-decimal code, which is read by the computer on a signal from the input bus Poll 9.

The command device 14 in the device is placed in a sealed case of sensors, made with a high degree of accuracy and small-sized. The dimensions of the sensor housing 180X180X120 mm. Structurally, the Command Apparatus 14 consists of two gears; the role of the small gear plays the axis of the strobe cylinder, at the end of which the teeth are cut. Large gear engages with a small gear. The gear ratio (i 10) is chosen in such a way that one turn of the strobe cylinder corresponds to the movement of the tuyere by 2 m, and the larger gear makes one turn when the tuyere moves by 20 m. A large roller is fixed to a gear that pushes one or several microswitches commutes (the number of microswitches depends on the number of selected reference points).

The microswitches can be moved around the circumference relative to the axis of the gear of a larger diameter. This is necessary to select the values of the focal points, i.e. the choice of the moment of entry of the frame (the moment

switching roller microswitch) when reaching a certain height of the tuyere over the metal, for example 2 m, 4 m with two reference points. 5 Such an implementation of the command device 14 significantly increases the accuracy of the correction, eliminates the additional cost of the cable to: the industrial command device, increases the accuracy and reliability of the device, the convenience of its service.

The installation of the controller 14 in the case of sensors 3, 5 and 13 allows you to quickly (with the drive running) and preliminarily (before installing the sensors) set any value of reference points.

Correction of the tuyere position (recording of the correction frame

0 /

The counter b) is implemented as follows. When raising or lowering, the lance passes a reference point, for example, 4 m, where correction must occur, command device 14 generates a longer signal by closing the microswitch.

This signal from the output of the command device 14 is fed to the second

 the input of the circuit 12, to the first input of which a pulse arrives (see fig. 3a) from the reference sensor 13. In the circuit 12, the gating of a longer signal from the command device 14 is effected by a pulse from the reference sensor 13, the moment of occurrence of which is always one-to-one.

The pulse from the output of the circuit 12 is fed to the input of the third node 11 of the optocoupler and the formation of a signal, where the galvanic isolation and the formation of a correction pulse occur (see Fig. 3g).

The correction impulse (FIG. 3g), having passed the second synchronization unit 10, rewrites the value of the reference point (4 m), stored in the reference register 16, into counter 6.

A signal from the controller 15 is issued once when the lance is moved all the way up (18 m) with one reference point, and the impulse

5 from the reference sensor 13 comes

once at each turn of the strobe cylinder 15 (2 m), but their gating occurs only at the moment when the tuyere passes the mark (4 m), i.e. correction values.

When repairing or replacing the tuyere, the value of the reference point (correction) is refined and entered into the reference register 16, where several values of the reference point can be stored.

Thus, due to the special placement of the sensors and the construction of the stroboclinder (the ability to place the sensors along the entire perimeter of the separating circumference of the stroblinder), the period of the information pulses becomes uniform, which in turn makes the resolution of the stroblinder real (

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quadrupling the information pulses), which eliminates failures in the AND-OR logic block due to the uniformity of the period of information pulses from the sensors, and also simplifies the installation of sensors and their configuration.

The introduction of the reference sensor 13, circuit 12, the optocoupler 11 and node 11, and the synchronization unit 10 makes it possible to gate the signal of the command device 14 with a pulse of the reference sensor 13, which significantly increases the accuracy of the correction input and, consequently, increases the accuracy of the entire device.

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Claims (1)

DEVICE FOR DIGITAL CONTROL OF THE POSITION OF OXYGEN LASER, containing two angular displacement sensors, a counter, the output of which is connected to the input of the communication unit with a computer, a command device, a correction unit, a quadruple of signals and a direction determination unit, characterized in that, in order to improve the accuracy of monitoring the position of the oxygen lances, a strobe cylinder, three nodes of optocoupler isolation and signal conditioning, a clock pulse generator, a reference register, a reference sensor, two synchronization units, an And circuit an AND-OR block, wherein the first input of an AND-OR logic block is connected to the output of the first optocoupler isolation and signal conditioning unit, the input of which is connected to the output of the first angular displacement sensor, the second input of the AND-OR logical unit is connected to the output of the second optocoupler a signal whose input is connected to the output of the second sensor of angular displacement, the reverse output of the AND-OR logic block is connected to the input of the Counter reverse, and the counting output of the AND-OR logic block is connected to the first input of the first block synchronization, the output of which is connected to the counter input of the counter, the second input of the first synchronization block is connected to the first output of the clock generator, the third input of the first synchronization block is connected by a common point with the Poll input bus and the first input of the second synchronization block, the second input of which is connected to the second output a 5g clock pulse generator, the third input of the secondTo synchronization block is connected to the output of the third node of the optocoupler isolation and signal generation, the input of which is connected to the output of the And circuit, the first input for which it is connected to the output of the reference sensor, the second input of the AND circuit is connected to the output of the control device, the input of which is mechanically connected to the axis of the strobe cylinder, and the output of the second synchronization unit is connected to the input Record the number of the counter, the input of which is connected to the output of the reference register, the command device in one housing with sensors, the strobocylinder is made with a reference slot, the angular distance between the angular displacement sensors is equal to, where N is the number, steps t between the teeth of the strobocylinder, and the angular distance of the turnip Foot sensor equal bH - ^ + Cat first or second sensor of angular displacements, somewhere uSU "1,178,771. 1 11